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jlechner |
/* Target-dependent code for PowerPC systems using the SVR4 ABI
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for GDB, the GNU debugger.
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Copyright (C) 2000, 2001, 2002, 2003, 2005, 2007, 2008
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Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "gdbcore.h"
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#include "inferior.h"
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#include "regcache.h"
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#include "value.h"
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#include "gdb_string.h"
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#include "gdb_assert.h"
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#include "ppc-tdep.h"
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#include "target.h"
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#include "objfiles.h"
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#include "infcall.h"
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/* Pass the arguments in either registers, or in the stack. Using the
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ppc sysv ABI, the first eight words of the argument list (that might
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be less than eight parameters if some parameters occupy more than one
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word) are passed in r3..r10 registers. float and double parameters are
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passed in fpr's, in addition to that. Rest of the parameters if any
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are passed in user stack.
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If the function is returning a structure, then the return address is passed
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in r3, then the first 7 words of the parametes can be passed in registers,
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starting from r4. */
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CORE_ADDR
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ppc_sysv_abi_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
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struct regcache *regcache, CORE_ADDR bp_addr,
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int nargs, struct value **args, CORE_ADDR sp,
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int struct_return, CORE_ADDR struct_addr)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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ULONGEST saved_sp;
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int argspace = 0; /* 0 is an initial wrong guess. */
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int write_pass;
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gdb_assert (tdep->wordsize == 4);
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regcache_cooked_read_unsigned (regcache, gdbarch_sp_regnum (gdbarch),
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&saved_sp);
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/* Go through the argument list twice.
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Pass 1: Figure out how much new stack space is required for
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arguments and pushed values. Unlike the PowerOpen ABI, the SysV
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ABI doesn't reserve any extra space for parameters which are put
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in registers, but does always push structures and then pass their
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address.
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Pass 2: Replay the same computation but this time also write the
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values out to the target. */
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for (write_pass = 0; write_pass < 2; write_pass++)
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{
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int argno;
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/* Next available floating point register for float and double
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arguments. */
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int freg = 1;
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/* Next available general register for non-float, non-vector
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arguments. */
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int greg = 3;
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/* Next available vector register for vector arguments. */
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int vreg = 2;
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/* Arguments start above the "LR save word" and "Back chain". */
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int argoffset = 2 * tdep->wordsize;
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/* Structures start after the arguments. */
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int structoffset = argoffset + argspace;
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/* If the function is returning a `struct', then the first word
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(which will be passed in r3) is used for struct return
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address. In that case we should advance one word and start
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from r4 register to copy parameters. */
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if (struct_return)
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{
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if (write_pass)
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regcache_cooked_write_signed (regcache,
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tdep->ppc_gp0_regnum + greg,
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struct_addr);
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greg++;
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}
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for (argno = 0; argno < nargs; argno++)
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{
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struct value *arg = args[argno];
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struct type *type = check_typedef (value_type (arg));
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int len = TYPE_LENGTH (type);
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const bfd_byte *val = value_contents (arg);
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if (TYPE_CODE (type) == TYPE_CODE_FLT && len <= 8
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&& !tdep->soft_float)
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{
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/* Floating point value converted to "double" then
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passed in an FP register, when the registers run out,
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8 byte aligned stack is used. */
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if (freg <= 8)
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{
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if (write_pass)
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{
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/* Always store the floating point value using
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the register's floating-point format. */
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gdb_byte regval[MAX_REGISTER_SIZE];
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struct type *regtype
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= register_type (gdbarch, tdep->ppc_fp0_regnum + freg);
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convert_typed_floating (val, type, regval, regtype);
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regcache_cooked_write (regcache,
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tdep->ppc_fp0_regnum + freg,
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regval);
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}
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freg++;
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}
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else
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{
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/* The SysV ABI tells us to convert floats to
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doubles before writing them to an 8 byte aligned
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stack location. Unfortunately GCC does not do
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that, and stores floats into 4 byte aligned
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locations without converting them to doubles.
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Since there is no know compiler that actually
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follows the ABI here, we implement the GCC
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convention. */
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/* Align to 4 bytes or 8 bytes depending on the type of
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the argument (float or double). */
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argoffset = align_up (argoffset, len);
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if (write_pass)
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write_memory (sp + argoffset, val, len);
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argoffset += len;
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}
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}
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else if (TYPE_CODE (type) == TYPE_CODE_FLT
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&& len == 16
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&& !tdep->soft_float
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&& (gdbarch_long_double_format (gdbarch)
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== floatformats_ibm_long_double))
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{
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/* IBM long double passed in two FP registers if
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available, otherwise 8-byte aligned stack. */
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if (freg <= 7)
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{
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if (write_pass)
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{
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regcache_cooked_write (regcache,
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tdep->ppc_fp0_regnum + freg,
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val);
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regcache_cooked_write (regcache,
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tdep->ppc_fp0_regnum + freg + 1,
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val + 8);
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}
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freg += 2;
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}
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else
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{
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argoffset = align_up (argoffset, 8);
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if (write_pass)
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write_memory (sp + argoffset, val, len);
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argoffset += 16;
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}
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}
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else if (len == 8
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&& (TYPE_CODE (type) == TYPE_CODE_INT /* long long */
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|| TYPE_CODE (type) == TYPE_CODE_FLT)) /* double */
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{
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/* "long long" or soft-float "double" passed in an odd/even
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register pair with the low addressed word in the odd
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register and the high addressed word in the even
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register, or when the registers run out an 8 byte
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aligned stack location. */
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if (greg > 9)
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{
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/* Just in case GREG was 10. */
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greg = 11;
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argoffset = align_up (argoffset, 8);
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if (write_pass)
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write_memory (sp + argoffset, val, len);
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argoffset += 8;
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}
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else
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{
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/* Must start on an odd register - r3/r4 etc. */
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if ((greg & 1) == 0)
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greg++;
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if (write_pass)
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{
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regcache_cooked_write (regcache,
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tdep->ppc_gp0_regnum + greg + 0,
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val + 0);
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regcache_cooked_write (regcache,
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tdep->ppc_gp0_regnum + greg + 1,
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val + 4);
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}
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greg += 2;
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}
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}
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else if (len == 16 && TYPE_CODE (type) == TYPE_CODE_FLT
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&& (gdbarch_long_double_format (gdbarch)
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== floatformats_ibm_long_double))
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{
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/* Soft-float IBM long double passed in four consecutive
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registers, or on the stack. The registers are not
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necessarily odd/even pairs. */
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if (greg > 7)
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{
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greg = 11;
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argoffset = align_up (argoffset, 8);
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if (write_pass)
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write_memory (sp + argoffset, val, len);
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argoffset += 16;
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}
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else
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{
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if (write_pass)
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{
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regcache_cooked_write (regcache,
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tdep->ppc_gp0_regnum + greg + 0,
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val + 0);
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regcache_cooked_write (regcache,
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tdep->ppc_gp0_regnum + greg + 1,
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val + 4);
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regcache_cooked_write (regcache,
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tdep->ppc_gp0_regnum + greg + 2,
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val + 8);
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regcache_cooked_write (regcache,
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tdep->ppc_gp0_regnum + greg + 3,
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val + 12);
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}
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greg += 4;
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}
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| 247 |
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}
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| 248 |
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else if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT && len <= 8
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&& !tdep->soft_float)
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| 250 |
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{
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| 251 |
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/* 32-bit and 64-bit decimal floats go in f1 .. f8. They can
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| 252 |
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end up in memory. */
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| 253 |
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if (freg <= 8)
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| 255 |
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{
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| 256 |
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if (write_pass)
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{
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gdb_byte regval[MAX_REGISTER_SIZE];
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const gdb_byte *p;
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| 260 |
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/* 32-bit decimal floats are right aligned in the
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doubleword. */
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| 263 |
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if (TYPE_LENGTH (type) == 4)
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{
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memcpy (regval + 4, val, 4);
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p = regval;
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| 267 |
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}
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else
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p = val;
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| 270 |
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| 271 |
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regcache_cooked_write (regcache,
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tdep->ppc_fp0_regnum + freg, p);
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| 273 |
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}
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| 274 |
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| 275 |
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freg++;
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| 276 |
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}
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| 277 |
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else
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| 278 |
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{
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| 279 |
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argoffset = align_up (argoffset, len);
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| 280 |
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| 281 |
|
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if (write_pass)
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| 282 |
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/* Write value in the stack's parameter save area. */
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| 283 |
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write_memory (sp + argoffset, val, len);
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| 284 |
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| 285 |
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argoffset += len;
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| 286 |
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}
|
| 287 |
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}
|
| 288 |
|
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else if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT && len == 16
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| 289 |
|
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&& !tdep->soft_float)
|
| 290 |
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{
|
| 291 |
|
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/* 128-bit decimal floats go in f2 .. f7, always in even/odd
|
| 292 |
|
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pairs. They can end up in memory, using two doublewords. */
|
| 293 |
|
|
|
| 294 |
|
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if (freg <= 6)
|
| 295 |
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{
|
| 296 |
|
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/* Make sure freg is even. */
|
| 297 |
|
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freg += freg & 1;
|
| 298 |
|
|
|
| 299 |
|
|
if (write_pass)
|
| 300 |
|
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{
|
| 301 |
|
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regcache_cooked_write (regcache,
|
| 302 |
|
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tdep->ppc_fp0_regnum + freg, val);
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| 303 |
|
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regcache_cooked_write (regcache,
|
| 304 |
|
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tdep->ppc_fp0_regnum + freg + 1, val + 8);
|
| 305 |
|
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}
|
| 306 |
|
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}
|
| 307 |
|
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else
|
| 308 |
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{
|
| 309 |
|
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argoffset = align_up (argoffset, 8);
|
| 310 |
|
|
|
| 311 |
|
|
if (write_pass)
|
| 312 |
|
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write_memory (sp + argoffset, val, 16);
|
| 313 |
|
|
|
| 314 |
|
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argoffset += 16;
|
| 315 |
|
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}
|
| 316 |
|
|
|
| 317 |
|
|
/* If a 128-bit decimal float goes to the stack because only f7
|
| 318 |
|
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and f8 are free (thus there's no even/odd register pair
|
| 319 |
|
|
available), these registers should be marked as occupied.
|
| 320 |
|
|
Hence we increase freg even when writing to memory. */
|
| 321 |
|
|
freg += 2;
|
| 322 |
|
|
}
|
| 323 |
|
|
else if (len == 16
|
| 324 |
|
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&& TYPE_CODE (type) == TYPE_CODE_ARRAY
|
| 325 |
|
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&& TYPE_VECTOR (type)
|
| 326 |
|
|
&& tdep->vector_abi == POWERPC_VEC_ALTIVEC)
|
| 327 |
|
|
{
|
| 328 |
|
|
/* Vector parameter passed in an Altivec register, or
|
| 329 |
|
|
when that runs out, 16 byte aligned stack location. */
|
| 330 |
|
|
if (vreg <= 13)
|
| 331 |
|
|
{
|
| 332 |
|
|
if (write_pass)
|
| 333 |
|
|
regcache_cooked_write (regcache,
|
| 334 |
|
|
tdep->ppc_vr0_regnum + vreg, val);
|
| 335 |
|
|
vreg++;
|
| 336 |
|
|
}
|
| 337 |
|
|
else
|
| 338 |
|
|
{
|
| 339 |
|
|
argoffset = align_up (argoffset, 16);
|
| 340 |
|
|
if (write_pass)
|
| 341 |
|
|
write_memory (sp + argoffset, val, 16);
|
| 342 |
|
|
argoffset += 16;
|
| 343 |
|
|
}
|
| 344 |
|
|
}
|
| 345 |
|
|
else if (len == 8
|
| 346 |
|
|
&& TYPE_CODE (type) == TYPE_CODE_ARRAY
|
| 347 |
|
|
&& TYPE_VECTOR (type)
|
| 348 |
|
|
&& tdep->vector_abi == POWERPC_VEC_SPE)
|
| 349 |
|
|
{
|
| 350 |
|
|
/* Vector parameter passed in an e500 register, or when
|
| 351 |
|
|
that runs out, 8 byte aligned stack location. Note
|
| 352 |
|
|
that since e500 vector and general purpose registers
|
| 353 |
|
|
both map onto the same underlying register set, a
|
| 354 |
|
|
"greg" and not a "vreg" is consumed here. A cooked
|
| 355 |
|
|
write stores the value in the correct locations
|
| 356 |
|
|
within the raw register cache. */
|
| 357 |
|
|
if (greg <= 10)
|
| 358 |
|
|
{
|
| 359 |
|
|
if (write_pass)
|
| 360 |
|
|
regcache_cooked_write (regcache,
|
| 361 |
|
|
tdep->ppc_ev0_regnum + greg, val);
|
| 362 |
|
|
greg++;
|
| 363 |
|
|
}
|
| 364 |
|
|
else
|
| 365 |
|
|
{
|
| 366 |
|
|
argoffset = align_up (argoffset, 8);
|
| 367 |
|
|
if (write_pass)
|
| 368 |
|
|
write_memory (sp + argoffset, val, 8);
|
| 369 |
|
|
argoffset += 8;
|
| 370 |
|
|
}
|
| 371 |
|
|
}
|
| 372 |
|
|
else
|
| 373 |
|
|
{
|
| 374 |
|
|
/* Reduce the parameter down to something that fits in a
|
| 375 |
|
|
"word". */
|
| 376 |
|
|
gdb_byte word[MAX_REGISTER_SIZE];
|
| 377 |
|
|
memset (word, 0, MAX_REGISTER_SIZE);
|
| 378 |
|
|
if (len > tdep->wordsize
|
| 379 |
|
|
|| TYPE_CODE (type) == TYPE_CODE_STRUCT
|
| 380 |
|
|
|| TYPE_CODE (type) == TYPE_CODE_UNION)
|
| 381 |
|
|
{
|
| 382 |
|
|
/* Structs and large values are put in an
|
| 383 |
|
|
aligned stack slot ... */
|
| 384 |
|
|
if (TYPE_CODE (type) == TYPE_CODE_ARRAY
|
| 385 |
|
|
&& TYPE_VECTOR (type)
|
| 386 |
|
|
&& len >= 16)
|
| 387 |
|
|
structoffset = align_up (structoffset, 16);
|
| 388 |
|
|
else
|
| 389 |
|
|
structoffset = align_up (structoffset, 8);
|
| 390 |
|
|
|
| 391 |
|
|
if (write_pass)
|
| 392 |
|
|
write_memory (sp + structoffset, val, len);
|
| 393 |
|
|
/* ... and then a "word" pointing to that address is
|
| 394 |
|
|
passed as the parameter. */
|
| 395 |
|
|
store_unsigned_integer (word, tdep->wordsize,
|
| 396 |
|
|
sp + structoffset);
|
| 397 |
|
|
structoffset += len;
|
| 398 |
|
|
}
|
| 399 |
|
|
else if (TYPE_CODE (type) == TYPE_CODE_INT)
|
| 400 |
|
|
/* Sign or zero extend the "int" into a "word". */
|
| 401 |
|
|
store_unsigned_integer (word, tdep->wordsize,
|
| 402 |
|
|
unpack_long (type, val));
|
| 403 |
|
|
else
|
| 404 |
|
|
/* Always goes in the low address. */
|
| 405 |
|
|
memcpy (word, val, len);
|
| 406 |
|
|
/* Store that "word" in a register, or on the stack.
|
| 407 |
|
|
The words have "4" byte alignment. */
|
| 408 |
|
|
if (greg <= 10)
|
| 409 |
|
|
{
|
| 410 |
|
|
if (write_pass)
|
| 411 |
|
|
regcache_cooked_write (regcache,
|
| 412 |
|
|
tdep->ppc_gp0_regnum + greg, word);
|
| 413 |
|
|
greg++;
|
| 414 |
|
|
}
|
| 415 |
|
|
else
|
| 416 |
|
|
{
|
| 417 |
|
|
argoffset = align_up (argoffset, tdep->wordsize);
|
| 418 |
|
|
if (write_pass)
|
| 419 |
|
|
write_memory (sp + argoffset, word, tdep->wordsize);
|
| 420 |
|
|
argoffset += tdep->wordsize;
|
| 421 |
|
|
}
|
| 422 |
|
|
}
|
| 423 |
|
|
}
|
| 424 |
|
|
|
| 425 |
|
|
/* Compute the actual stack space requirements. */
|
| 426 |
|
|
if (!write_pass)
|
| 427 |
|
|
{
|
| 428 |
|
|
/* Remember the amount of space needed by the arguments. */
|
| 429 |
|
|
argspace = argoffset;
|
| 430 |
|
|
/* Allocate space for both the arguments and the structures. */
|
| 431 |
|
|
sp -= (argoffset + structoffset);
|
| 432 |
|
|
/* Ensure that the stack is still 16 byte aligned. */
|
| 433 |
|
|
sp = align_down (sp, 16);
|
| 434 |
|
|
}
|
| 435 |
|
|
|
| 436 |
|
|
/* The psABI says that "A caller of a function that takes a
|
| 437 |
|
|
variable argument list shall set condition register bit 6 to
|
| 438 |
|
|
1 if it passes one or more arguments in the floating-point
|
| 439 |
|
|
registers. It is strongly recommended that the caller set the
|
| 440 |
|
|
bit to 0 otherwise..." Doing this for normal functions too
|
| 441 |
|
|
shouldn't hurt. */
|
| 442 |
|
|
if (write_pass)
|
| 443 |
|
|
{
|
| 444 |
|
|
ULONGEST cr;
|
| 445 |
|
|
|
| 446 |
|
|
regcache_cooked_read_unsigned (regcache, tdep->ppc_cr_regnum, &cr);
|
| 447 |
|
|
if (freg > 1)
|
| 448 |
|
|
cr |= 0x02000000;
|
| 449 |
|
|
else
|
| 450 |
|
|
cr &= ~0x02000000;
|
| 451 |
|
|
regcache_cooked_write_unsigned (regcache, tdep->ppc_cr_regnum, cr);
|
| 452 |
|
|
}
|
| 453 |
|
|
}
|
| 454 |
|
|
|
| 455 |
|
|
/* Update %sp. */
|
| 456 |
|
|
regcache_cooked_write_signed (regcache, gdbarch_sp_regnum (gdbarch), sp);
|
| 457 |
|
|
|
| 458 |
|
|
/* Write the backchain (it occupies WORDSIZED bytes). */
|
| 459 |
|
|
write_memory_signed_integer (sp, tdep->wordsize, saved_sp);
|
| 460 |
|
|
|
| 461 |
|
|
/* Point the inferior function call's return address at the dummy's
|
| 462 |
|
|
breakpoint. */
|
| 463 |
|
|
regcache_cooked_write_signed (regcache, tdep->ppc_lr_regnum, bp_addr);
|
| 464 |
|
|
|
| 465 |
|
|
return sp;
|
| 466 |
|
|
}
|
| 467 |
|
|
|
| 468 |
|
|
/* Handle the return-value conventions for Decimal Floating Point values
|
| 469 |
|
|
in both ppc32 and ppc64, which are the same. */
|
| 470 |
|
|
static int
|
| 471 |
|
|
get_decimal_float_return_value (struct gdbarch *gdbarch, struct type *valtype,
|
| 472 |
|
|
struct regcache *regcache, gdb_byte *readbuf,
|
| 473 |
|
|
const gdb_byte *writebuf)
|
| 474 |
|
|
{
|
| 475 |
|
|
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
| 476 |
|
|
|
| 477 |
|
|
gdb_assert (TYPE_CODE (valtype) == TYPE_CODE_DECFLOAT);
|
| 478 |
|
|
|
| 479 |
|
|
/* 32-bit and 64-bit decimal floats in f1. */
|
| 480 |
|
|
if (TYPE_LENGTH (valtype) <= 8)
|
| 481 |
|
|
{
|
| 482 |
|
|
if (writebuf != NULL)
|
| 483 |
|
|
{
|
| 484 |
|
|
gdb_byte regval[MAX_REGISTER_SIZE];
|
| 485 |
|
|
const gdb_byte *p;
|
| 486 |
|
|
|
| 487 |
|
|
/* 32-bit decimal float is right aligned in the doubleword. */
|
| 488 |
|
|
if (TYPE_LENGTH (valtype) == 4)
|
| 489 |
|
|
{
|
| 490 |
|
|
memcpy (regval + 4, writebuf, 4);
|
| 491 |
|
|
p = regval;
|
| 492 |
|
|
}
|
| 493 |
|
|
else
|
| 494 |
|
|
p = writebuf;
|
| 495 |
|
|
|
| 496 |
|
|
regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1, p);
|
| 497 |
|
|
}
|
| 498 |
|
|
if (readbuf != NULL)
|
| 499 |
|
|
{
|
| 500 |
|
|
regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1, readbuf);
|
| 501 |
|
|
|
| 502 |
|
|
/* Left align 32-bit decimal float. */
|
| 503 |
|
|
if (TYPE_LENGTH (valtype) == 4)
|
| 504 |
|
|
memcpy (readbuf, readbuf + 4, 4);
|
| 505 |
|
|
}
|
| 506 |
|
|
}
|
| 507 |
|
|
/* 128-bit decimal floats in f2,f3. */
|
| 508 |
|
|
else if (TYPE_LENGTH (valtype) == 16)
|
| 509 |
|
|
{
|
| 510 |
|
|
if (writebuf != NULL || readbuf != NULL)
|
| 511 |
|
|
{
|
| 512 |
|
|
int i;
|
| 513 |
|
|
|
| 514 |
|
|
for (i = 0; i < 2; i++)
|
| 515 |
|
|
{
|
| 516 |
|
|
if (writebuf != NULL)
|
| 517 |
|
|
regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 2 + i,
|
| 518 |
|
|
writebuf + i * 8);
|
| 519 |
|
|
if (readbuf != NULL)
|
| 520 |
|
|
regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 2 + i,
|
| 521 |
|
|
readbuf + i * 8);
|
| 522 |
|
|
}
|
| 523 |
|
|
}
|
| 524 |
|
|
}
|
| 525 |
|
|
else
|
| 526 |
|
|
/* Can't happen. */
|
| 527 |
|
|
internal_error (__FILE__, __LINE__, "Unknown decimal float size.");
|
| 528 |
|
|
|
| 529 |
|
|
return RETURN_VALUE_REGISTER_CONVENTION;
|
| 530 |
|
|
}
|
| 531 |
|
|
|
| 532 |
|
|
/* Handle the return-value conventions specified by the SysV 32-bit
|
| 533 |
|
|
PowerPC ABI (including all the supplements):
|
| 534 |
|
|
|
| 535 |
|
|
no floating-point: floating-point values returned using 32-bit
|
| 536 |
|
|
general-purpose registers.
|
| 537 |
|
|
|
| 538 |
|
|
Altivec: 128-bit vectors returned using vector registers.
|
| 539 |
|
|
|
| 540 |
|
|
e500: 64-bit vectors returned using the full full 64 bit EV
|
| 541 |
|
|
register, floating-point values returned using 32-bit
|
| 542 |
|
|
general-purpose registers.
|
| 543 |
|
|
|
| 544 |
|
|
GCC (broken): Small struct values right (instead of left) aligned
|
| 545 |
|
|
when returned in general-purpose registers. */
|
| 546 |
|
|
|
| 547 |
|
|
static enum return_value_convention
|
| 548 |
|
|
do_ppc_sysv_return_value (struct gdbarch *gdbarch, struct type *type,
|
| 549 |
|
|
struct regcache *regcache, gdb_byte *readbuf,
|
| 550 |
|
|
const gdb_byte *writebuf, int broken_gcc)
|
| 551 |
|
|
{
|
| 552 |
|
|
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
| 553 |
|
|
gdb_assert (tdep->wordsize == 4);
|
| 554 |
|
|
if (TYPE_CODE (type) == TYPE_CODE_FLT
|
| 555 |
|
|
&& TYPE_LENGTH (type) <= 8
|
| 556 |
|
|
&& !tdep->soft_float)
|
| 557 |
|
|
{
|
| 558 |
|
|
if (readbuf)
|
| 559 |
|
|
{
|
| 560 |
|
|
/* Floats and doubles stored in "f1". Convert the value to
|
| 561 |
|
|
the required type. */
|
| 562 |
|
|
gdb_byte regval[MAX_REGISTER_SIZE];
|
| 563 |
|
|
struct type *regtype = register_type (gdbarch,
|
| 564 |
|
|
tdep->ppc_fp0_regnum + 1);
|
| 565 |
|
|
regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1, regval);
|
| 566 |
|
|
convert_typed_floating (regval, regtype, readbuf, type);
|
| 567 |
|
|
}
|
| 568 |
|
|
if (writebuf)
|
| 569 |
|
|
{
|
| 570 |
|
|
/* Floats and doubles stored in "f1". Convert the value to
|
| 571 |
|
|
the register's "double" type. */
|
| 572 |
|
|
gdb_byte regval[MAX_REGISTER_SIZE];
|
| 573 |
|
|
struct type *regtype = register_type (gdbarch, tdep->ppc_fp0_regnum);
|
| 574 |
|
|
convert_typed_floating (writebuf, type, regval, regtype);
|
| 575 |
|
|
regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1, regval);
|
| 576 |
|
|
}
|
| 577 |
|
|
return RETURN_VALUE_REGISTER_CONVENTION;
|
| 578 |
|
|
}
|
| 579 |
|
|
if (TYPE_CODE (type) == TYPE_CODE_FLT
|
| 580 |
|
|
&& TYPE_LENGTH (type) == 16
|
| 581 |
|
|
&& !tdep->soft_float
|
| 582 |
|
|
&& (gdbarch_long_double_format (gdbarch) == floatformats_ibm_long_double))
|
| 583 |
|
|
{
|
| 584 |
|
|
/* IBM long double stored in f1 and f2. */
|
| 585 |
|
|
if (readbuf)
|
| 586 |
|
|
{
|
| 587 |
|
|
regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1, readbuf);
|
| 588 |
|
|
regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 2,
|
| 589 |
|
|
readbuf + 8);
|
| 590 |
|
|
}
|
| 591 |
|
|
if (writebuf)
|
| 592 |
|
|
{
|
| 593 |
|
|
regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1, writebuf);
|
| 594 |
|
|
regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 2,
|
| 595 |
|
|
writebuf + 8);
|
| 596 |
|
|
}
|
| 597 |
|
|
return RETURN_VALUE_REGISTER_CONVENTION;
|
| 598 |
|
|
}
|
| 599 |
|
|
if (TYPE_CODE (type) == TYPE_CODE_FLT
|
| 600 |
|
|
&& TYPE_LENGTH (type) == 16
|
| 601 |
|
|
&& (gdbarch_long_double_format (gdbarch) == floatformats_ibm_long_double))
|
| 602 |
|
|
{
|
| 603 |
|
|
/* Soft-float IBM long double stored in r3, r4, r5, r6. */
|
| 604 |
|
|
if (readbuf)
|
| 605 |
|
|
{
|
| 606 |
|
|
regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3, readbuf);
|
| 607 |
|
|
regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 4,
|
| 608 |
|
|
readbuf + 4);
|
| 609 |
|
|
regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 5,
|
| 610 |
|
|
readbuf + 8);
|
| 611 |
|
|
regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 6,
|
| 612 |
|
|
readbuf + 12);
|
| 613 |
|
|
}
|
| 614 |
|
|
if (writebuf)
|
| 615 |
|
|
{
|
| 616 |
|
|
regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3, writebuf);
|
| 617 |
|
|
regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 4,
|
| 618 |
|
|
writebuf + 4);
|
| 619 |
|
|
regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 5,
|
| 620 |
|
|
writebuf + 8);
|
| 621 |
|
|
regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 6,
|
| 622 |
|
|
writebuf + 12);
|
| 623 |
|
|
}
|
| 624 |
|
|
return RETURN_VALUE_REGISTER_CONVENTION;
|
| 625 |
|
|
}
|
| 626 |
|
|
if ((TYPE_CODE (type) == TYPE_CODE_INT && TYPE_LENGTH (type) == 8)
|
| 627 |
|
|
|| (TYPE_CODE (type) == TYPE_CODE_FLT && TYPE_LENGTH (type) == 8))
|
| 628 |
|
|
{
|
| 629 |
|
|
if (readbuf)
|
| 630 |
|
|
{
|
| 631 |
|
|
/* A long long, or a double stored in the 32 bit r3/r4. */
|
| 632 |
|
|
regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3,
|
| 633 |
|
|
readbuf + 0);
|
| 634 |
|
|
regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 4,
|
| 635 |
|
|
readbuf + 4);
|
| 636 |
|
|
}
|
| 637 |
|
|
if (writebuf)
|
| 638 |
|
|
{
|
| 639 |
|
|
/* A long long, or a double stored in the 32 bit r3/r4. */
|
| 640 |
|
|
regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3,
|
| 641 |
|
|
writebuf + 0);
|
| 642 |
|
|
regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 4,
|
| 643 |
|
|
writebuf + 4);
|
| 644 |
|
|
}
|
| 645 |
|
|
return RETURN_VALUE_REGISTER_CONVENTION;
|
| 646 |
|
|
}
|
| 647 |
|
|
if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT && !tdep->soft_float)
|
| 648 |
|
|
return get_decimal_float_return_value (gdbarch, type, regcache, readbuf,
|
| 649 |
|
|
writebuf);
|
| 650 |
|
|
else if ((TYPE_CODE (type) == TYPE_CODE_INT
|
| 651 |
|
|
|| TYPE_CODE (type) == TYPE_CODE_CHAR
|
| 652 |
|
|
|| TYPE_CODE (type) == TYPE_CODE_BOOL
|
| 653 |
|
|
|| TYPE_CODE (type) == TYPE_CODE_PTR
|
| 654 |
|
|
|| TYPE_CODE (type) == TYPE_CODE_REF
|
| 655 |
|
|
|| TYPE_CODE (type) == TYPE_CODE_ENUM)
|
| 656 |
|
|
&& TYPE_LENGTH (type) <= tdep->wordsize)
|
| 657 |
|
|
{
|
| 658 |
|
|
if (readbuf)
|
| 659 |
|
|
{
|
| 660 |
|
|
/* Some sort of integer stored in r3. Since TYPE isn't
|
| 661 |
|
|
bigger than the register, sign extension isn't a problem
|
| 662 |
|
|
- just do everything unsigned. */
|
| 663 |
|
|
ULONGEST regval;
|
| 664 |
|
|
regcache_cooked_read_unsigned (regcache, tdep->ppc_gp0_regnum + 3,
|
| 665 |
|
|
®val);
|
| 666 |
|
|
store_unsigned_integer (readbuf, TYPE_LENGTH (type), regval);
|
| 667 |
|
|
}
|
| 668 |
|
|
if (writebuf)
|
| 669 |
|
|
{
|
| 670 |
|
|
/* Some sort of integer stored in r3. Use unpack_long since
|
| 671 |
|
|
that should handle any required sign extension. */
|
| 672 |
|
|
regcache_cooked_write_unsigned (regcache, tdep->ppc_gp0_regnum + 3,
|
| 673 |
|
|
unpack_long (type, writebuf));
|
| 674 |
|
|
}
|
| 675 |
|
|
return RETURN_VALUE_REGISTER_CONVENTION;
|
| 676 |
|
|
}
|
| 677 |
|
|
if (TYPE_LENGTH (type) == 16
|
| 678 |
|
|
&& TYPE_CODE (type) == TYPE_CODE_ARRAY
|
| 679 |
|
|
&& TYPE_VECTOR (type)
|
| 680 |
|
|
&& tdep->vector_abi == POWERPC_VEC_ALTIVEC)
|
| 681 |
|
|
{
|
| 682 |
|
|
if (readbuf)
|
| 683 |
|
|
{
|
| 684 |
|
|
/* Altivec places the return value in "v2". */
|
| 685 |
|
|
regcache_cooked_read (regcache, tdep->ppc_vr0_regnum + 2, readbuf);
|
| 686 |
|
|
}
|
| 687 |
|
|
if (writebuf)
|
| 688 |
|
|
{
|
| 689 |
|
|
/* Altivec places the return value in "v2". */
|
| 690 |
|
|
regcache_cooked_write (regcache, tdep->ppc_vr0_regnum + 2, writebuf);
|
| 691 |
|
|
}
|
| 692 |
|
|
return RETURN_VALUE_REGISTER_CONVENTION;
|
| 693 |
|
|
}
|
| 694 |
|
|
if (TYPE_LENGTH (type) == 16
|
| 695 |
|
|
&& TYPE_CODE (type) == TYPE_CODE_ARRAY
|
| 696 |
|
|
&& TYPE_VECTOR (type)
|
| 697 |
|
|
&& tdep->vector_abi == POWERPC_VEC_GENERIC)
|
| 698 |
|
|
{
|
| 699 |
|
|
/* GCC -maltivec -mabi=no-altivec returns vectors in r3/r4/r5/r6.
|
| 700 |
|
|
GCC without AltiVec returns them in memory, but it warns about
|
| 701 |
|
|
ABI risks in that case; we don't try to support it. */
|
| 702 |
|
|
if (readbuf)
|
| 703 |
|
|
{
|
| 704 |
|
|
regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3,
|
| 705 |
|
|
readbuf + 0);
|
| 706 |
|
|
regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 4,
|
| 707 |
|
|
readbuf + 4);
|
| 708 |
|
|
regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 5,
|
| 709 |
|
|
readbuf + 8);
|
| 710 |
|
|
regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 6,
|
| 711 |
|
|
readbuf + 12);
|
| 712 |
|
|
}
|
| 713 |
|
|
if (writebuf)
|
| 714 |
|
|
{
|
| 715 |
|
|
regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3,
|
| 716 |
|
|
writebuf + 0);
|
| 717 |
|
|
regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 4,
|
| 718 |
|
|
writebuf + 4);
|
| 719 |
|
|
regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 5,
|
| 720 |
|
|
writebuf + 8);
|
| 721 |
|
|
regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 6,
|
| 722 |
|
|
writebuf + 12);
|
| 723 |
|
|
}
|
| 724 |
|
|
return RETURN_VALUE_REGISTER_CONVENTION;
|
| 725 |
|
|
}
|
| 726 |
|
|
if (TYPE_LENGTH (type) == 8
|
| 727 |
|
|
&& TYPE_CODE (type) == TYPE_CODE_ARRAY
|
| 728 |
|
|
&& TYPE_VECTOR (type)
|
| 729 |
|
|
&& tdep->vector_abi == POWERPC_VEC_SPE)
|
| 730 |
|
|
{
|
| 731 |
|
|
/* The e500 ABI places return values for the 64-bit DSP types
|
| 732 |
|
|
(__ev64_opaque__) in r3. However, in GDB-speak, ev3
|
| 733 |
|
|
corresponds to the entire r3 value for e500, whereas GDB's r3
|
| 734 |
|
|
only corresponds to the least significant 32-bits. So place
|
| 735 |
|
|
the 64-bit DSP type's value in ev3. */
|
| 736 |
|
|
if (readbuf)
|
| 737 |
|
|
regcache_cooked_read (regcache, tdep->ppc_ev0_regnum + 3, readbuf);
|
| 738 |
|
|
if (writebuf)
|
| 739 |
|
|
regcache_cooked_write (regcache, tdep->ppc_ev0_regnum + 3, writebuf);
|
| 740 |
|
|
return RETURN_VALUE_REGISTER_CONVENTION;
|
| 741 |
|
|
}
|
| 742 |
|
|
if (broken_gcc && TYPE_LENGTH (type) <= 8)
|
| 743 |
|
|
{
|
| 744 |
|
|
/* GCC screwed up for structures or unions whose size is less
|
| 745 |
|
|
than or equal to 8 bytes.. Instead of left-aligning, it
|
| 746 |
|
|
right-aligns the data into the buffer formed by r3, r4. */
|
| 747 |
|
|
gdb_byte regvals[MAX_REGISTER_SIZE * 2];
|
| 748 |
|
|
int len = TYPE_LENGTH (type);
|
| 749 |
|
|
int offset = (2 * tdep->wordsize - len) % tdep->wordsize;
|
| 750 |
|
|
|
| 751 |
|
|
if (readbuf)
|
| 752 |
|
|
{
|
| 753 |
|
|
regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3,
|
| 754 |
|
|
regvals + 0 * tdep->wordsize);
|
| 755 |
|
|
if (len > tdep->wordsize)
|
| 756 |
|
|
regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 4,
|
| 757 |
|
|
regvals + 1 * tdep->wordsize);
|
| 758 |
|
|
memcpy (readbuf, regvals + offset, len);
|
| 759 |
|
|
}
|
| 760 |
|
|
if (writebuf)
|
| 761 |
|
|
{
|
| 762 |
|
|
memset (regvals, 0, sizeof regvals);
|
| 763 |
|
|
memcpy (regvals + offset, writebuf, len);
|
| 764 |
|
|
regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3,
|
| 765 |
|
|
regvals + 0 * tdep->wordsize);
|
| 766 |
|
|
if (len > tdep->wordsize)
|
| 767 |
|
|
regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 4,
|
| 768 |
|
|
regvals + 1 * tdep->wordsize);
|
| 769 |
|
|
}
|
| 770 |
|
|
|
| 771 |
|
|
return RETURN_VALUE_REGISTER_CONVENTION;
|
| 772 |
|
|
}
|
| 773 |
|
|
if (TYPE_LENGTH (type) <= 8)
|
| 774 |
|
|
{
|
| 775 |
|
|
if (readbuf)
|
| 776 |
|
|
{
|
| 777 |
|
|
/* This matches SVr4 PPC, it does not match GCC. */
|
| 778 |
|
|
/* The value is right-padded to 8 bytes and then loaded, as
|
| 779 |
|
|
two "words", into r3/r4. */
|
| 780 |
|
|
gdb_byte regvals[MAX_REGISTER_SIZE * 2];
|
| 781 |
|
|
regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3,
|
| 782 |
|
|
regvals + 0 * tdep->wordsize);
|
| 783 |
|
|
if (TYPE_LENGTH (type) > tdep->wordsize)
|
| 784 |
|
|
regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 4,
|
| 785 |
|
|
regvals + 1 * tdep->wordsize);
|
| 786 |
|
|
memcpy (readbuf, regvals, TYPE_LENGTH (type));
|
| 787 |
|
|
}
|
| 788 |
|
|
if (writebuf)
|
| 789 |
|
|
{
|
| 790 |
|
|
/* This matches SVr4 PPC, it does not match GCC. */
|
| 791 |
|
|
/* The value is padded out to 8 bytes and then loaded, as
|
| 792 |
|
|
two "words" into r3/r4. */
|
| 793 |
|
|
gdb_byte regvals[MAX_REGISTER_SIZE * 2];
|
| 794 |
|
|
memset (regvals, 0, sizeof regvals);
|
| 795 |
|
|
memcpy (regvals, writebuf, TYPE_LENGTH (type));
|
| 796 |
|
|
regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3,
|
| 797 |
|
|
regvals + 0 * tdep->wordsize);
|
| 798 |
|
|
if (TYPE_LENGTH (type) > tdep->wordsize)
|
| 799 |
|
|
regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 4,
|
| 800 |
|
|
regvals + 1 * tdep->wordsize);
|
| 801 |
|
|
}
|
| 802 |
|
|
return RETURN_VALUE_REGISTER_CONVENTION;
|
| 803 |
|
|
}
|
| 804 |
|
|
return RETURN_VALUE_STRUCT_CONVENTION;
|
| 805 |
|
|
}
|
| 806 |
|
|
|
| 807 |
|
|
enum return_value_convention
|
| 808 |
|
|
ppc_sysv_abi_return_value (struct gdbarch *gdbarch, struct type *valtype,
|
| 809 |
|
|
struct regcache *regcache, gdb_byte *readbuf,
|
| 810 |
|
|
const gdb_byte *writebuf)
|
| 811 |
|
|
{
|
| 812 |
|
|
return do_ppc_sysv_return_value (gdbarch, valtype, regcache, readbuf,
|
| 813 |
|
|
writebuf, 0);
|
| 814 |
|
|
}
|
| 815 |
|
|
|
| 816 |
|
|
enum return_value_convention
|
| 817 |
|
|
ppc_sysv_abi_broken_return_value (struct gdbarch *gdbarch,
|
| 818 |
|
|
struct type *valtype,
|
| 819 |
|
|
struct regcache *regcache,
|
| 820 |
|
|
gdb_byte *readbuf, const gdb_byte *writebuf)
|
| 821 |
|
|
{
|
| 822 |
|
|
return do_ppc_sysv_return_value (gdbarch, valtype, regcache, readbuf,
|
| 823 |
|
|
writebuf, 1);
|
| 824 |
|
|
}
|
| 825 |
|
|
|
| 826 |
|
|
/* The helper function for 64-bit SYSV push_dummy_call. Converts the
|
| 827 |
|
|
function's code address back into the function's descriptor
|
| 828 |
|
|
address.
|
| 829 |
|
|
|
| 830 |
|
|
Find a value for the TOC register. Every symbol should have both
|
| 831 |
|
|
".FN" and "FN" in the minimal symbol table. "FN" points at the
|
| 832 |
|
|
FN's descriptor, while ".FN" points at the entry point (which
|
| 833 |
|
|
matches FUNC_ADDR). Need to reverse from FUNC_ADDR back to the
|
| 834 |
|
|
FN's descriptor address (while at the same time being careful to
|
| 835 |
|
|
find "FN" in the same object file as ".FN"). */
|
| 836 |
|
|
|
| 837 |
|
|
static int
|
| 838 |
|
|
convert_code_addr_to_desc_addr (CORE_ADDR code_addr, CORE_ADDR *desc_addr)
|
| 839 |
|
|
{
|
| 840 |
|
|
struct obj_section *dot_fn_section;
|
| 841 |
|
|
struct minimal_symbol *dot_fn;
|
| 842 |
|
|
struct minimal_symbol *fn;
|
| 843 |
|
|
CORE_ADDR toc;
|
| 844 |
|
|
/* Find the minimal symbol that corresponds to CODE_ADDR (should
|
| 845 |
|
|
have a name of the form ".FN"). */
|
| 846 |
|
|
dot_fn = lookup_minimal_symbol_by_pc (code_addr);
|
| 847 |
|
|
if (dot_fn == NULL || SYMBOL_LINKAGE_NAME (dot_fn)[0] != '.')
|
| 848 |
|
|
return 0;
|
| 849 |
|
|
/* Get the section that contains CODE_ADDR. Need this for the
|
| 850 |
|
|
"objfile" that it contains. */
|
| 851 |
|
|
dot_fn_section = find_pc_section (code_addr);
|
| 852 |
|
|
if (dot_fn_section == NULL || dot_fn_section->objfile == NULL)
|
| 853 |
|
|
return 0;
|
| 854 |
|
|
/* Now find the corresponding "FN" (dropping ".") minimal symbol's
|
| 855 |
|
|
address. Only look for the minimal symbol in ".FN"'s object file
|
| 856 |
|
|
- avoids problems when two object files (i.e., shared libraries)
|
| 857 |
|
|
contain a minimal symbol with the same name. */
|
| 858 |
|
|
fn = lookup_minimal_symbol (SYMBOL_LINKAGE_NAME (dot_fn) + 1, NULL,
|
| 859 |
|
|
dot_fn_section->objfile);
|
| 860 |
|
|
if (fn == NULL)
|
| 861 |
|
|
return 0;
|
| 862 |
|
|
/* Found a descriptor. */
|
| 863 |
|
|
(*desc_addr) = SYMBOL_VALUE_ADDRESS (fn);
|
| 864 |
|
|
return 1;
|
| 865 |
|
|
}
|
| 866 |
|
|
|
| 867 |
|
|
/* Pass the arguments in either registers, or in the stack. Using the
|
| 868 |
|
|
ppc 64 bit SysV ABI.
|
| 869 |
|
|
|
| 870 |
|
|
This implements a dumbed down version of the ABI. It always writes
|
| 871 |
|
|
values to memory, GPR and FPR, even when not necessary. Doing this
|
| 872 |
|
|
greatly simplifies the logic. */
|
| 873 |
|
|
|
| 874 |
|
|
CORE_ADDR
|
| 875 |
|
|
ppc64_sysv_abi_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
|
| 876 |
|
|
struct regcache *regcache, CORE_ADDR bp_addr,
|
| 877 |
|
|
int nargs, struct value **args, CORE_ADDR sp,
|
| 878 |
|
|
int struct_return, CORE_ADDR struct_addr)
|
| 879 |
|
|
{
|
| 880 |
|
|
CORE_ADDR func_addr = find_function_addr (function, NULL);
|
| 881 |
|
|
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
| 882 |
|
|
ULONGEST back_chain;
|
| 883 |
|
|
/* See for-loop comment below. */
|
| 884 |
|
|
int write_pass;
|
| 885 |
|
|
/* Size of the Altivec's vector parameter region, the final value is
|
| 886 |
|
|
computed in the for-loop below. */
|
| 887 |
|
|
LONGEST vparam_size = 0;
|
| 888 |
|
|
/* Size of the general parameter region, the final value is computed
|
| 889 |
|
|
in the for-loop below. */
|
| 890 |
|
|
LONGEST gparam_size = 0;
|
| 891 |
|
|
/* Kevin writes ... I don't mind seeing tdep->wordsize used in the
|
| 892 |
|
|
calls to align_up(), align_down(), etc. because this makes it
|
| 893 |
|
|
easier to reuse this code (in a copy/paste sense) in the future,
|
| 894 |
|
|
but it is a 64-bit ABI and asserting that the wordsize is 8 bytes
|
| 895 |
|
|
at some point makes it easier to verify that this function is
|
| 896 |
|
|
correct without having to do a non-local analysis to figure out
|
| 897 |
|
|
the possible values of tdep->wordsize. */
|
| 898 |
|
|
gdb_assert (tdep->wordsize == 8);
|
| 899 |
|
|
|
| 900 |
|
|
/* This function exists to support a calling convention that
|
| 901 |
|
|
requires floating-point registers. It shouldn't be used on
|
| 902 |
|
|
processors that lack them. */
|
| 903 |
|
|
gdb_assert (ppc_floating_point_unit_p (gdbarch));
|
| 904 |
|
|
|
| 905 |
|
|
/* By this stage in the proceedings, SP has been decremented by "red
|
| 906 |
|
|
zone size" + "struct return size". Fetch the stack-pointer from
|
| 907 |
|
|
before this and use that as the BACK_CHAIN. */
|
| 908 |
|
|
regcache_cooked_read_unsigned (regcache, gdbarch_sp_regnum (gdbarch),
|
| 909 |
|
|
&back_chain);
|
| 910 |
|
|
|
| 911 |
|
|
/* Go through the argument list twice.
|
| 912 |
|
|
|
| 913 |
|
|
Pass 1: Compute the function call's stack space and register
|
| 914 |
|
|
requirements.
|
| 915 |
|
|
|
| 916 |
|
|
Pass 2: Replay the same computation but this time also write the
|
| 917 |
|
|
values out to the target. */
|
| 918 |
|
|
|
| 919 |
|
|
for (write_pass = 0; write_pass < 2; write_pass++)
|
| 920 |
|
|
{
|
| 921 |
|
|
int argno;
|
| 922 |
|
|
/* Next available floating point register for float and double
|
| 923 |
|
|
arguments. */
|
| 924 |
|
|
int freg = 1;
|
| 925 |
|
|
/* Next available general register for non-vector (but possibly
|
| 926 |
|
|
float) arguments. */
|
| 927 |
|
|
int greg = 3;
|
| 928 |
|
|
/* Next available vector register for vector arguments. */
|
| 929 |
|
|
int vreg = 2;
|
| 930 |
|
|
/* The address, at which the next general purpose parameter
|
| 931 |
|
|
(integer, struct, float, ...) should be saved. */
|
| 932 |
|
|
CORE_ADDR gparam;
|
| 933 |
|
|
/* Address, at which the next Altivec vector parameter should be
|
| 934 |
|
|
saved. */
|
| 935 |
|
|
CORE_ADDR vparam;
|
| 936 |
|
|
|
| 937 |
|
|
if (!write_pass)
|
| 938 |
|
|
{
|
| 939 |
|
|
/* During the first pass, GPARAM and VPARAM are more like
|
| 940 |
|
|
offsets (start address zero) than addresses. That way
|
| 941 |
|
|
the accumulate the total stack space each region
|
| 942 |
|
|
requires. */
|
| 943 |
|
|
gparam = 0;
|
| 944 |
|
|
vparam = 0;
|
| 945 |
|
|
}
|
| 946 |
|
|
else
|
| 947 |
|
|
{
|
| 948 |
|
|
/* Decrement the stack pointer making space for the Altivec
|
| 949 |
|
|
and general on-stack parameters. Set vparam and gparam
|
| 950 |
|
|
to their corresponding regions. */
|
| 951 |
|
|
vparam = align_down (sp - vparam_size, 16);
|
| 952 |
|
|
gparam = align_down (vparam - gparam_size, 16);
|
| 953 |
|
|
/* Add in space for the TOC, link editor double word,
|
| 954 |
|
|
compiler double word, LR save area, CR save area. */
|
| 955 |
|
|
sp = align_down (gparam - 48, 16);
|
| 956 |
|
|
}
|
| 957 |
|
|
|
| 958 |
|
|
/* If the function is returning a `struct', then there is an
|
| 959 |
|
|
extra hidden parameter (which will be passed in r3)
|
| 960 |
|
|
containing the address of that struct.. In that case we
|
| 961 |
|
|
should advance one word and start from r4 register to copy
|
| 962 |
|
|
parameters. This also consumes one on-stack parameter slot. */
|
| 963 |
|
|
if (struct_return)
|
| 964 |
|
|
{
|
| 965 |
|
|
if (write_pass)
|
| 966 |
|
|
regcache_cooked_write_signed (regcache,
|
| 967 |
|
|
tdep->ppc_gp0_regnum + greg,
|
| 968 |
|
|
struct_addr);
|
| 969 |
|
|
greg++;
|
| 970 |
|
|
gparam = align_up (gparam + tdep->wordsize, tdep->wordsize);
|
| 971 |
|
|
}
|
| 972 |
|
|
|
| 973 |
|
|
for (argno = 0; argno < nargs; argno++)
|
| 974 |
|
|
{
|
| 975 |
|
|
struct value *arg = args[argno];
|
| 976 |
|
|
struct type *type = check_typedef (value_type (arg));
|
| 977 |
|
|
const bfd_byte *val = value_contents (arg);
|
| 978 |
|
|
|
| 979 |
|
|
if (TYPE_CODE (type) == TYPE_CODE_FLT && TYPE_LENGTH (type) <= 8)
|
| 980 |
|
|
{
|
| 981 |
|
|
/* Floats and Doubles go in f1 .. f13. They also
|
| 982 |
|
|
consume a left aligned GREG,, and can end up in
|
| 983 |
|
|
memory. */
|
| 984 |
|
|
if (write_pass)
|
| 985 |
|
|
{
|
| 986 |
|
|
gdb_byte regval[MAX_REGISTER_SIZE];
|
| 987 |
|
|
const gdb_byte *p;
|
| 988 |
|
|
|
| 989 |
|
|
/* Version 1.7 of the 64-bit PowerPC ELF ABI says:
|
| 990 |
|
|
|
| 991 |
|
|
"Single precision floating point values are mapped to
|
| 992 |
|
|
the first word in a single doubleword."
|
| 993 |
|
|
|
| 994 |
|
|
And version 1.9 says:
|
| 995 |
|
|
|
| 996 |
|
|
"Single precision floating point values are mapped to
|
| 997 |
|
|
the second word in a single doubleword."
|
| 998 |
|
|
|
| 999 |
|
|
GDB then writes single precision floating point values
|
| 1000 |
|
|
at both words in a doubleword, to support both ABIs. */
|
| 1001 |
|
|
if (TYPE_LENGTH (type) == 4)
|
| 1002 |
|
|
{
|
| 1003 |
|
|
memcpy (regval, val, 4);
|
| 1004 |
|
|
memcpy (regval + 4, val, 4);
|
| 1005 |
|
|
p = regval;
|
| 1006 |
|
|
}
|
| 1007 |
|
|
else
|
| 1008 |
|
|
p = val;
|
| 1009 |
|
|
|
| 1010 |
|
|
/* Write value in the stack's parameter save area. */
|
| 1011 |
|
|
write_memory (gparam, p, 8);
|
| 1012 |
|
|
|
| 1013 |
|
|
if (freg <= 13)
|
| 1014 |
|
|
{
|
| 1015 |
|
|
struct type *regtype
|
| 1016 |
|
|
= register_type (gdbarch, tdep->ppc_fp0_regnum);
|
| 1017 |
|
|
|
| 1018 |
|
|
convert_typed_floating (val, type, regval, regtype);
|
| 1019 |
|
|
regcache_cooked_write (regcache,
|
| 1020 |
|
|
tdep->ppc_fp0_regnum + freg,
|
| 1021 |
|
|
regval);
|
| 1022 |
|
|
}
|
| 1023 |
|
|
if (greg <= 10)
|
| 1024 |
|
|
regcache_cooked_write (regcache,
|
| 1025 |
|
|
tdep->ppc_gp0_regnum + greg,
|
| 1026 |
|
|
regval);
|
| 1027 |
|
|
}
|
| 1028 |
|
|
|
| 1029 |
|
|
freg++;
|
| 1030 |
|
|
greg++;
|
| 1031 |
|
|
/* Always consume parameter stack space. */
|
| 1032 |
|
|
gparam = align_up (gparam + 8, tdep->wordsize);
|
| 1033 |
|
|
}
|
| 1034 |
|
|
else if (TYPE_CODE (type) == TYPE_CODE_FLT
|
| 1035 |
|
|
&& TYPE_LENGTH (type) == 16
|
| 1036 |
|
|
&& (gdbarch_long_double_format (gdbarch)
|
| 1037 |
|
|
== floatformats_ibm_long_double))
|
| 1038 |
|
|
{
|
| 1039 |
|
|
/* IBM long double stored in two doublewords of the
|
| 1040 |
|
|
parameter save area and corresponding registers. */
|
| 1041 |
|
|
if (write_pass)
|
| 1042 |
|
|
{
|
| 1043 |
|
|
if (!tdep->soft_float && freg <= 13)
|
| 1044 |
|
|
{
|
| 1045 |
|
|
regcache_cooked_write (regcache,
|
| 1046 |
|
|
tdep->ppc_fp0_regnum + freg,
|
| 1047 |
|
|
val);
|
| 1048 |
|
|
if (freg <= 12)
|
| 1049 |
|
|
regcache_cooked_write (regcache,
|
| 1050 |
|
|
tdep->ppc_fp0_regnum + freg + 1,
|
| 1051 |
|
|
val + 8);
|
| 1052 |
|
|
}
|
| 1053 |
|
|
if (greg <= 10)
|
| 1054 |
|
|
{
|
| 1055 |
|
|
regcache_cooked_write (regcache,
|
| 1056 |
|
|
tdep->ppc_gp0_regnum + greg,
|
| 1057 |
|
|
val);
|
| 1058 |
|
|
if (greg <= 9)
|
| 1059 |
|
|
regcache_cooked_write (regcache,
|
| 1060 |
|
|
tdep->ppc_gp0_regnum + greg + 1,
|
| 1061 |
|
|
val + 8);
|
| 1062 |
|
|
}
|
| 1063 |
|
|
write_memory (gparam, val, TYPE_LENGTH (type));
|
| 1064 |
|
|
}
|
| 1065 |
|
|
freg += 2;
|
| 1066 |
|
|
greg += 2;
|
| 1067 |
|
|
gparam = align_up (gparam + TYPE_LENGTH (type), tdep->wordsize);
|
| 1068 |
|
|
}
|
| 1069 |
|
|
else if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT
|
| 1070 |
|
|
&& TYPE_LENGTH (type) <= 8)
|
| 1071 |
|
|
{
|
| 1072 |
|
|
/* 32-bit and 64-bit decimal floats go in f1 .. f13. They can
|
| 1073 |
|
|
end up in memory. */
|
| 1074 |
|
|
if (write_pass)
|
| 1075 |
|
|
{
|
| 1076 |
|
|
gdb_byte regval[MAX_REGISTER_SIZE];
|
| 1077 |
|
|
const gdb_byte *p;
|
| 1078 |
|
|
|
| 1079 |
|
|
/* 32-bit decimal floats are right aligned in the
|
| 1080 |
|
|
doubleword. */
|
| 1081 |
|
|
if (TYPE_LENGTH (type) == 4)
|
| 1082 |
|
|
{
|
| 1083 |
|
|
memcpy (regval + 4, val, 4);
|
| 1084 |
|
|
p = regval;
|
| 1085 |
|
|
}
|
| 1086 |
|
|
else
|
| 1087 |
|
|
p = val;
|
| 1088 |
|
|
|
| 1089 |
|
|
/* Write value in the stack's parameter save area. */
|
| 1090 |
|
|
write_memory (gparam, p, 8);
|
| 1091 |
|
|
|
| 1092 |
|
|
if (freg <= 13)
|
| 1093 |
|
|
regcache_cooked_write (regcache,
|
| 1094 |
|
|
tdep->ppc_fp0_regnum + freg, p);
|
| 1095 |
|
|
}
|
| 1096 |
|
|
|
| 1097 |
|
|
freg++;
|
| 1098 |
|
|
greg++;
|
| 1099 |
|
|
/* Always consume parameter stack space. */
|
| 1100 |
|
|
gparam = align_up (gparam + 8, tdep->wordsize);
|
| 1101 |
|
|
}
|
| 1102 |
|
|
else if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT &&
|
| 1103 |
|
|
TYPE_LENGTH (type) == 16)
|
| 1104 |
|
|
{
|
| 1105 |
|
|
/* 128-bit decimal floats go in f2 .. f12, always in even/odd
|
| 1106 |
|
|
pairs. They can end up in memory, using two doublewords. */
|
| 1107 |
|
|
if (write_pass)
|
| 1108 |
|
|
{
|
| 1109 |
|
|
if (freg <= 12)
|
| 1110 |
|
|
{
|
| 1111 |
|
|
/* Make sure freg is even. */
|
| 1112 |
|
|
freg += freg & 1;
|
| 1113 |
|
|
regcache_cooked_write (regcache,
|
| 1114 |
|
|
tdep->ppc_fp0_regnum + freg, val);
|
| 1115 |
|
|
regcache_cooked_write (regcache,
|
| 1116 |
|
|
tdep->ppc_fp0_regnum + freg + 1, val + 8);
|
| 1117 |
|
|
}
|
| 1118 |
|
|
|
| 1119 |
|
|
write_memory (gparam, val, TYPE_LENGTH (type));
|
| 1120 |
|
|
}
|
| 1121 |
|
|
|
| 1122 |
|
|
freg += 2;
|
| 1123 |
|
|
greg += 2;
|
| 1124 |
|
|
gparam = align_up (gparam + TYPE_LENGTH (type), tdep->wordsize);
|
| 1125 |
|
|
}
|
| 1126 |
|
|
else if (TYPE_LENGTH (type) == 16 && TYPE_VECTOR (type)
|
| 1127 |
|
|
&& TYPE_CODE (type) == TYPE_CODE_ARRAY
|
| 1128 |
|
|
&& tdep->ppc_vr0_regnum >= 0)
|
| 1129 |
|
|
{
|
| 1130 |
|
|
/* In the Altivec ABI, vectors go in the vector
|
| 1131 |
|
|
registers v2 .. v13, or when that runs out, a vector
|
| 1132 |
|
|
annex which goes above all the normal parameters.
|
| 1133 |
|
|
NOTE: cagney/2003-09-21: This is a guess based on the
|
| 1134 |
|
|
PowerOpen Altivec ABI. */
|
| 1135 |
|
|
if (vreg <= 13)
|
| 1136 |
|
|
{
|
| 1137 |
|
|
if (write_pass)
|
| 1138 |
|
|
regcache_cooked_write (regcache,
|
| 1139 |
|
|
tdep->ppc_vr0_regnum + vreg, val);
|
| 1140 |
|
|
vreg++;
|
| 1141 |
|
|
}
|
| 1142 |
|
|
else
|
| 1143 |
|
|
{
|
| 1144 |
|
|
if (write_pass)
|
| 1145 |
|
|
write_memory (vparam, val, TYPE_LENGTH (type));
|
| 1146 |
|
|
vparam = align_up (vparam + TYPE_LENGTH (type), 16);
|
| 1147 |
|
|
}
|
| 1148 |
|
|
}
|
| 1149 |
|
|
else if ((TYPE_CODE (type) == TYPE_CODE_INT
|
| 1150 |
|
|
|| TYPE_CODE (type) == TYPE_CODE_ENUM
|
| 1151 |
|
|
|| TYPE_CODE (type) == TYPE_CODE_PTR)
|
| 1152 |
|
|
&& TYPE_LENGTH (type) <= 8)
|
| 1153 |
|
|
{
|
| 1154 |
|
|
/* Scalars and Pointers get sign[un]extended and go in
|
| 1155 |
|
|
gpr3 .. gpr10. They can also end up in memory. */
|
| 1156 |
|
|
if (write_pass)
|
| 1157 |
|
|
{
|
| 1158 |
|
|
/* Sign extend the value, then store it unsigned. */
|
| 1159 |
|
|
ULONGEST word = unpack_long (type, val);
|
| 1160 |
|
|
/* Convert any function code addresses into
|
| 1161 |
|
|
descriptors. */
|
| 1162 |
|
|
if (TYPE_CODE (type) == TYPE_CODE_PTR
|
| 1163 |
|
|
&& TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_FUNC)
|
| 1164 |
|
|
{
|
| 1165 |
|
|
CORE_ADDR desc = word;
|
| 1166 |
|
|
convert_code_addr_to_desc_addr (word, &desc);
|
| 1167 |
|
|
word = desc;
|
| 1168 |
|
|
}
|
| 1169 |
|
|
if (greg <= 10)
|
| 1170 |
|
|
regcache_cooked_write_unsigned (regcache,
|
| 1171 |
|
|
tdep->ppc_gp0_regnum +
|
| 1172 |
|
|
greg, word);
|
| 1173 |
|
|
write_memory_unsigned_integer (gparam, tdep->wordsize,
|
| 1174 |
|
|
word);
|
| 1175 |
|
|
}
|
| 1176 |
|
|
greg++;
|
| 1177 |
|
|
gparam = align_up (gparam + TYPE_LENGTH (type), tdep->wordsize);
|
| 1178 |
|
|
}
|
| 1179 |
|
|
else
|
| 1180 |
|
|
{
|
| 1181 |
|
|
int byte;
|
| 1182 |
|
|
for (byte = 0; byte < TYPE_LENGTH (type);
|
| 1183 |
|
|
byte += tdep->wordsize)
|
| 1184 |
|
|
{
|
| 1185 |
|
|
if (write_pass && greg <= 10)
|
| 1186 |
|
|
{
|
| 1187 |
|
|
gdb_byte regval[MAX_REGISTER_SIZE];
|
| 1188 |
|
|
int len = TYPE_LENGTH (type) - byte;
|
| 1189 |
|
|
if (len > tdep->wordsize)
|
| 1190 |
|
|
len = tdep->wordsize;
|
| 1191 |
|
|
memset (regval, 0, sizeof regval);
|
| 1192 |
|
|
/* The ABI (version 1.9) specifies that values
|
| 1193 |
|
|
smaller than one doubleword are right-aligned
|
| 1194 |
|
|
and those larger are left-aligned. GCC
|
| 1195 |
|
|
versions before 3.4 implemented this
|
| 1196 |
|
|
incorrectly; see
|
| 1197 |
|
|
<http://gcc.gnu.org/gcc-3.4/powerpc-abi.html>. */
|
| 1198 |
|
|
if (byte == 0)
|
| 1199 |
|
|
memcpy (regval + tdep->wordsize - len,
|
| 1200 |
|
|
val + byte, len);
|
| 1201 |
|
|
else
|
| 1202 |
|
|
memcpy (regval, val + byte, len);
|
| 1203 |
|
|
regcache_cooked_write (regcache, greg, regval);
|
| 1204 |
|
|
}
|
| 1205 |
|
|
greg++;
|
| 1206 |
|
|
}
|
| 1207 |
|
|
if (write_pass)
|
| 1208 |
|
|
/* WARNING: cagney/2003-09-21: Strictly speaking, this
|
| 1209 |
|
|
isn't necessary, unfortunately, GCC appears to get
|
| 1210 |
|
|
"struct convention" parameter passing wrong putting
|
| 1211 |
|
|
odd sized structures in memory instead of in a
|
| 1212 |
|
|
register. Work around this by always writing the
|
| 1213 |
|
|
value to memory. Fortunately, doing this
|
| 1214 |
|
|
simplifies the code. */
|
| 1215 |
|
|
write_memory (gparam, val, TYPE_LENGTH (type));
|
| 1216 |
|
|
if (freg <= 13
|
| 1217 |
|
|
&& TYPE_CODE (type) == TYPE_CODE_STRUCT
|
| 1218 |
|
|
&& TYPE_NFIELDS (type) == 1
|
| 1219 |
|
|
&& TYPE_LENGTH (type) <= 16)
|
| 1220 |
|
|
{
|
| 1221 |
|
|
/* The ABI (version 1.9) specifies that structs
|
| 1222 |
|
|
containing a single floating-point value, at any
|
| 1223 |
|
|
level of nesting of single-member structs, are
|
| 1224 |
|
|
passed in floating-point registers. */
|
| 1225 |
|
|
while (TYPE_CODE (type) == TYPE_CODE_STRUCT
|
| 1226 |
|
|
&& TYPE_NFIELDS (type) == 1)
|
| 1227 |
|
|
type = check_typedef (TYPE_FIELD_TYPE (type, 0));
|
| 1228 |
|
|
if (TYPE_CODE (type) == TYPE_CODE_FLT)
|
| 1229 |
|
|
{
|
| 1230 |
|
|
if (TYPE_LENGTH (type) <= 8)
|
| 1231 |
|
|
{
|
| 1232 |
|
|
if (write_pass)
|
| 1233 |
|
|
{
|
| 1234 |
|
|
gdb_byte regval[MAX_REGISTER_SIZE];
|
| 1235 |
|
|
struct type *regtype
|
| 1236 |
|
|
= register_type (gdbarch,
|
| 1237 |
|
|
tdep->ppc_fp0_regnum);
|
| 1238 |
|
|
convert_typed_floating (val, type, regval,
|
| 1239 |
|
|
regtype);
|
| 1240 |
|
|
regcache_cooked_write (regcache,
|
| 1241 |
|
|
(tdep->ppc_fp0_regnum
|
| 1242 |
|
|
+ freg),
|
| 1243 |
|
|
regval);
|
| 1244 |
|
|
}
|
| 1245 |
|
|
freg++;
|
| 1246 |
|
|
}
|
| 1247 |
|
|
else if (TYPE_LENGTH (type) == 16
|
| 1248 |
|
|
&& (gdbarch_long_double_format (gdbarch)
|
| 1249 |
|
|
== floatformats_ibm_long_double))
|
| 1250 |
|
|
{
|
| 1251 |
|
|
if (write_pass)
|
| 1252 |
|
|
{
|
| 1253 |
|
|
regcache_cooked_write (regcache,
|
| 1254 |
|
|
(tdep->ppc_fp0_regnum
|
| 1255 |
|
|
+ freg),
|
| 1256 |
|
|
val);
|
| 1257 |
|
|
if (freg <= 12)
|
| 1258 |
|
|
regcache_cooked_write (regcache,
|
| 1259 |
|
|
(tdep->ppc_fp0_regnum
|
| 1260 |
|
|
+ freg + 1),
|
| 1261 |
|
|
val + 8);
|
| 1262 |
|
|
}
|
| 1263 |
|
|
freg += 2;
|
| 1264 |
|
|
}
|
| 1265 |
|
|
}
|
| 1266 |
|
|
}
|
| 1267 |
|
|
/* Always consume parameter stack space. */
|
| 1268 |
|
|
gparam = align_up (gparam + TYPE_LENGTH (type), tdep->wordsize);
|
| 1269 |
|
|
}
|
| 1270 |
|
|
}
|
| 1271 |
|
|
|
| 1272 |
|
|
if (!write_pass)
|
| 1273 |
|
|
{
|
| 1274 |
|
|
/* Save the true region sizes ready for the second pass. */
|
| 1275 |
|
|
vparam_size = vparam;
|
| 1276 |
|
|
/* Make certain that the general parameter save area is at
|
| 1277 |
|
|
least the minimum 8 registers (or doublewords) in size. */
|
| 1278 |
|
|
if (greg < 8)
|
| 1279 |
|
|
gparam_size = 8 * tdep->wordsize;
|
| 1280 |
|
|
else
|
| 1281 |
|
|
gparam_size = gparam;
|
| 1282 |
|
|
}
|
| 1283 |
|
|
}
|
| 1284 |
|
|
|
| 1285 |
|
|
/* Update %sp. */
|
| 1286 |
|
|
regcache_cooked_write_signed (regcache, gdbarch_sp_regnum (gdbarch), sp);
|
| 1287 |
|
|
|
| 1288 |
|
|
/* Write the backchain (it occupies WORDSIZED bytes). */
|
| 1289 |
|
|
write_memory_signed_integer (sp, tdep->wordsize, back_chain);
|
| 1290 |
|
|
|
| 1291 |
|
|
/* Point the inferior function call's return address at the dummy's
|
| 1292 |
|
|
breakpoint. */
|
| 1293 |
|
|
regcache_cooked_write_signed (regcache, tdep->ppc_lr_regnum, bp_addr);
|
| 1294 |
|
|
|
| 1295 |
|
|
/* Use the func_addr to find the descriptor, and use that to find
|
| 1296 |
|
|
the TOC. */
|
| 1297 |
|
|
{
|
| 1298 |
|
|
CORE_ADDR desc_addr;
|
| 1299 |
|
|
if (convert_code_addr_to_desc_addr (func_addr, &desc_addr))
|
| 1300 |
|
|
{
|
| 1301 |
|
|
/* The TOC is the second double word in the descriptor. */
|
| 1302 |
|
|
CORE_ADDR toc =
|
| 1303 |
|
|
read_memory_unsigned_integer (desc_addr + tdep->wordsize,
|
| 1304 |
|
|
tdep->wordsize);
|
| 1305 |
|
|
regcache_cooked_write_unsigned (regcache,
|
| 1306 |
|
|
tdep->ppc_gp0_regnum + 2, toc);
|
| 1307 |
|
|
}
|
| 1308 |
|
|
}
|
| 1309 |
|
|
|
| 1310 |
|
|
return sp;
|
| 1311 |
|
|
}
|
| 1312 |
|
|
|
| 1313 |
|
|
|
| 1314 |
|
|
/* The 64 bit ABI return value convention.
|
| 1315 |
|
|
|
| 1316 |
|
|
Return non-zero if the return-value is stored in a register, return
|
| 1317 |
|
|
|
| 1318 |
|
|
struct return convention).
|
| 1319 |
|
|
|
| 1320 |
|
|
For a return-value stored in a register: when WRITEBUF is non-NULL,
|
| 1321 |
|
|
copy the buffer to the corresponding register return-value location
|
| 1322 |
|
|
location; when READBUF is non-NULL, fill the buffer from the
|
| 1323 |
|
|
corresponding register return-value location. */
|
| 1324 |
|
|
enum return_value_convention
|
| 1325 |
|
|
ppc64_sysv_abi_return_value (struct gdbarch *gdbarch, struct type *valtype,
|
| 1326 |
|
|
struct regcache *regcache, gdb_byte *readbuf,
|
| 1327 |
|
|
const gdb_byte *writebuf)
|
| 1328 |
|
|
{
|
| 1329 |
|
|
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
| 1330 |
|
|
|
| 1331 |
|
|
/* This function exists to support a calling convention that
|
| 1332 |
|
|
requires floating-point registers. It shouldn't be used on
|
| 1333 |
|
|
processors that lack them. */
|
| 1334 |
|
|
gdb_assert (ppc_floating_point_unit_p (gdbarch));
|
| 1335 |
|
|
|
| 1336 |
|
|
/* Floats and doubles in F1. */
|
| 1337 |
|
|
if (TYPE_CODE (valtype) == TYPE_CODE_FLT && TYPE_LENGTH (valtype) <= 8)
|
| 1338 |
|
|
{
|
| 1339 |
|
|
gdb_byte regval[MAX_REGISTER_SIZE];
|
| 1340 |
|
|
struct type *regtype = register_type (gdbarch, tdep->ppc_fp0_regnum);
|
| 1341 |
|
|
if (writebuf != NULL)
|
| 1342 |
|
|
{
|
| 1343 |
|
|
convert_typed_floating (writebuf, valtype, regval, regtype);
|
| 1344 |
|
|
regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1, regval);
|
| 1345 |
|
|
}
|
| 1346 |
|
|
if (readbuf != NULL)
|
| 1347 |
|
|
{
|
| 1348 |
|
|
regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1, regval);
|
| 1349 |
|
|
convert_typed_floating (regval, regtype, readbuf, valtype);
|
| 1350 |
|
|
}
|
| 1351 |
|
|
return RETURN_VALUE_REGISTER_CONVENTION;
|
| 1352 |
|
|
}
|
| 1353 |
|
|
if (TYPE_CODE (valtype) == TYPE_CODE_DECFLOAT)
|
| 1354 |
|
|
return get_decimal_float_return_value (gdbarch, valtype, regcache, readbuf,
|
| 1355 |
|
|
writebuf);
|
| 1356 |
|
|
/* Integers in r3. */
|
| 1357 |
|
|
if ((TYPE_CODE (valtype) == TYPE_CODE_INT
|
| 1358 |
|
|
|| TYPE_CODE (valtype) == TYPE_CODE_ENUM)
|
| 1359 |
|
|
&& TYPE_LENGTH (valtype) <= 8)
|
| 1360 |
|
|
{
|
| 1361 |
|
|
if (writebuf != NULL)
|
| 1362 |
|
|
{
|
| 1363 |
|
|
/* Be careful to sign extend the value. */
|
| 1364 |
|
|
regcache_cooked_write_unsigned (regcache, tdep->ppc_gp0_regnum + 3,
|
| 1365 |
|
|
unpack_long (valtype, writebuf));
|
| 1366 |
|
|
}
|
| 1367 |
|
|
if (readbuf != NULL)
|
| 1368 |
|
|
{
|
| 1369 |
|
|
/* Extract the integer from r3. Since this is truncating the
|
| 1370 |
|
|
value, there isn't a sign extension problem. */
|
| 1371 |
|
|
ULONGEST regval;
|
| 1372 |
|
|
regcache_cooked_read_unsigned (regcache, tdep->ppc_gp0_regnum + 3,
|
| 1373 |
|
|
®val);
|
| 1374 |
|
|
store_unsigned_integer (readbuf, TYPE_LENGTH (valtype), regval);
|
| 1375 |
|
|
}
|
| 1376 |
|
|
return RETURN_VALUE_REGISTER_CONVENTION;
|
| 1377 |
|
|
}
|
| 1378 |
|
|
/* All pointers live in r3. */
|
| 1379 |
|
|
if (TYPE_CODE (valtype) == TYPE_CODE_PTR)
|
| 1380 |
|
|
{
|
| 1381 |
|
|
/* All pointers live in r3. */
|
| 1382 |
|
|
if (writebuf != NULL)
|
| 1383 |
|
|
regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3, writebuf);
|
| 1384 |
|
|
if (readbuf != NULL)
|
| 1385 |
|
|
regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3, readbuf);
|
| 1386 |
|
|
return RETURN_VALUE_REGISTER_CONVENTION;
|
| 1387 |
|
|
}
|
| 1388 |
|
|
/* Array type has more than one use. */
|
| 1389 |
|
|
if (TYPE_CODE (valtype) == TYPE_CODE_ARRAY)
|
| 1390 |
|
|
{
|
| 1391 |
|
|
/* Small character arrays are returned, right justified, in r3. */
|
| 1392 |
|
|
if (TYPE_LENGTH (valtype) <= 8
|
| 1393 |
|
|
&& TYPE_CODE (TYPE_TARGET_TYPE (valtype)) == TYPE_CODE_INT
|
| 1394 |
|
|
&& TYPE_LENGTH (TYPE_TARGET_TYPE (valtype)) == 1)
|
| 1395 |
|
|
{
|
| 1396 |
|
|
int offset = (register_size (gdbarch, tdep->ppc_gp0_regnum + 3)
|
| 1397 |
|
|
- TYPE_LENGTH (valtype));
|
| 1398 |
|
|
if (writebuf != NULL)
|
| 1399 |
|
|
regcache_cooked_write_part (regcache, tdep->ppc_gp0_regnum + 3,
|
| 1400 |
|
|
offset, TYPE_LENGTH (valtype), writebuf);
|
| 1401 |
|
|
if (readbuf != NULL)
|
| 1402 |
|
|
regcache_cooked_read_part (regcache, tdep->ppc_gp0_regnum + 3,
|
| 1403 |
|
|
offset, TYPE_LENGTH (valtype), readbuf);
|
| 1404 |
|
|
return RETURN_VALUE_REGISTER_CONVENTION;
|
| 1405 |
|
|
}
|
| 1406 |
|
|
/* A VMX vector is returned in v2. */
|
| 1407 |
|
|
if (TYPE_CODE (valtype) == TYPE_CODE_ARRAY
|
| 1408 |
|
|
&& TYPE_VECTOR (valtype) && tdep->ppc_vr0_regnum >= 0)
|
| 1409 |
|
|
{
|
| 1410 |
|
|
if (readbuf)
|
| 1411 |
|
|
regcache_cooked_read (regcache, tdep->ppc_vr0_regnum + 2, readbuf);
|
| 1412 |
|
|
if (writebuf)
|
| 1413 |
|
|
regcache_cooked_write (regcache, tdep->ppc_vr0_regnum + 2, writebuf);
|
| 1414 |
|
|
return RETURN_VALUE_REGISTER_CONVENTION;
|
| 1415 |
|
|
}
|
| 1416 |
|
|
}
|
| 1417 |
|
|
/* Big floating point values get stored in adjacent floating
|
| 1418 |
|
|
point registers, starting with F1. */
|
| 1419 |
|
|
if (TYPE_CODE (valtype) == TYPE_CODE_FLT
|
| 1420 |
|
|
&& (TYPE_LENGTH (valtype) == 16 || TYPE_LENGTH (valtype) == 32))
|
| 1421 |
|
|
{
|
| 1422 |
|
|
if (writebuf || readbuf != NULL)
|
| 1423 |
|
|
{
|
| 1424 |
|
|
int i;
|
| 1425 |
|
|
for (i = 0; i < TYPE_LENGTH (valtype) / 8; i++)
|
| 1426 |
|
|
{
|
| 1427 |
|
|
if (writebuf != NULL)
|
| 1428 |
|
|
regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1 + i,
|
| 1429 |
|
|
(const bfd_byte *) writebuf + i * 8);
|
| 1430 |
|
|
if (readbuf != NULL)
|
| 1431 |
|
|
regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1 + i,
|
| 1432 |
|
|
(bfd_byte *) readbuf + i * 8);
|
| 1433 |
|
|
}
|
| 1434 |
|
|
}
|
| 1435 |
|
|
return RETURN_VALUE_REGISTER_CONVENTION;
|
| 1436 |
|
|
}
|
| 1437 |
|
|
/* Complex values get returned in f1:f2, need to convert. */
|
| 1438 |
|
|
if (TYPE_CODE (valtype) == TYPE_CODE_COMPLEX
|
| 1439 |
|
|
&& (TYPE_LENGTH (valtype) == 8 || TYPE_LENGTH (valtype) == 16))
|
| 1440 |
|
|
{
|
| 1441 |
|
|
if (regcache != NULL)
|
| 1442 |
|
|
{
|
| 1443 |
|
|
int i;
|
| 1444 |
|
|
for (i = 0; i < 2; i++)
|
| 1445 |
|
|
{
|
| 1446 |
|
|
gdb_byte regval[MAX_REGISTER_SIZE];
|
| 1447 |
|
|
struct type *regtype =
|
| 1448 |
|
|
register_type (gdbarch, tdep->ppc_fp0_regnum);
|
| 1449 |
|
|
if (writebuf != NULL)
|
| 1450 |
|
|
{
|
| 1451 |
|
|
convert_typed_floating ((const bfd_byte *) writebuf +
|
| 1452 |
|
|
i * (TYPE_LENGTH (valtype) / 2),
|
| 1453 |
|
|
valtype, regval, regtype);
|
| 1454 |
|
|
regcache_cooked_write (regcache,
|
| 1455 |
|
|
tdep->ppc_fp0_regnum + 1 + i,
|
| 1456 |
|
|
regval);
|
| 1457 |
|
|
}
|
| 1458 |
|
|
if (readbuf != NULL)
|
| 1459 |
|
|
{
|
| 1460 |
|
|
regcache_cooked_read (regcache,
|
| 1461 |
|
|
tdep->ppc_fp0_regnum + 1 + i,
|
| 1462 |
|
|
regval);
|
| 1463 |
|
|
convert_typed_floating (regval, regtype,
|
| 1464 |
|
|
(bfd_byte *) readbuf +
|
| 1465 |
|
|
i * (TYPE_LENGTH (valtype) / 2),
|
| 1466 |
|
|
valtype);
|
| 1467 |
|
|
}
|
| 1468 |
|
|
}
|
| 1469 |
|
|
}
|
| 1470 |
|
|
return RETURN_VALUE_REGISTER_CONVENTION;
|
| 1471 |
|
|
}
|
| 1472 |
|
|
/* Big complex values get stored in f1:f4. */
|
| 1473 |
|
|
if (TYPE_CODE (valtype) == TYPE_CODE_COMPLEX && TYPE_LENGTH (valtype) == 32)
|
| 1474 |
|
|
{
|
| 1475 |
|
|
if (regcache != NULL)
|
| 1476 |
|
|
{
|
| 1477 |
|
|
int i;
|
| 1478 |
|
|
for (i = 0; i < 4; i++)
|
| 1479 |
|
|
{
|
| 1480 |
|
|
if (writebuf != NULL)
|
| 1481 |
|
|
regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1 + i,
|
| 1482 |
|
|
(const bfd_byte *) writebuf + i * 8);
|
| 1483 |
|
|
if (readbuf != NULL)
|
| 1484 |
|
|
regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1 + i,
|
| 1485 |
|
|
(bfd_byte *) readbuf + i * 8);
|
| 1486 |
|
|
}
|
| 1487 |
|
|
}
|
| 1488 |
|
|
return RETURN_VALUE_REGISTER_CONVENTION;
|
| 1489 |
|
|
}
|
| 1490 |
|
|
return RETURN_VALUE_STRUCT_CONVENTION;
|
| 1491 |
|
|
}
|
| 1492 |
|
|
|
| 1493 |
|
|
CORE_ADDR
|
| 1494 |
|
|
ppc64_sysv_abi_adjust_breakpoint_address (struct gdbarch *gdbarch,
|
| 1495 |
|
|
CORE_ADDR bpaddr)
|
| 1496 |
|
|
{
|
| 1497 |
|
|
/* PPC64 SYSV specifies that the minimal-symbol "FN" should point at
|
| 1498 |
|
|
a function-descriptor while the corresponding minimal-symbol
|
| 1499 |
|
|
".FN" should point at the entry point. Consequently, a command
|
| 1500 |
|
|
like "break FN" applied to an object file with only minimal
|
| 1501 |
|
|
symbols, will insert the breakpoint into the descriptor at "FN"
|
| 1502 |
|
|
and not the function at ".FN". Avoid this confusion by adjusting
|
| 1503 |
|
|
any attempt to set a descriptor breakpoint into a corresponding
|
| 1504 |
|
|
function breakpoint. Note that GDB warns the user when this
|
| 1505 |
|
|
adjustment is applied - that's ok as otherwise the user will have
|
| 1506 |
|
|
no way of knowing why their breakpoint at "FN" resulted in the
|
| 1507 |
|
|
program stopping at ".FN". */
|
| 1508 |
|
|
return gdbarch_convert_from_func_ptr_addr (gdbarch, bpaddr, ¤t_target);
|
| 1509 |
|
|
}
|
