URL
https://opencores.org/ocsvn/openrisc/openrisc/trunk
Subversion Repositories openrisc
[/] [openrisc/] [trunk/] [gnu-old/] [gdb-6.8/] [gdb/] [or1k-tdep.c] - Rev 157
Go to most recent revision | Compare with Previous | Blame | View Log
/* Target-dependent code for the or1k architecture, for GDB, the GNU Debugger. Copyright 1988-2008, Free Software Foundation, Inc. Copyright (C) 2008 Embecosm Limited Contributed by Alessandro Forin(af@cs.cmu.edu at CMU and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin. Contributor Jeremy Bennett <jeremy.bennett@embecosm.com> This file is part of GDB. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ /*----------------------------------------------------------------------------- This version for the OpenRISC 1000 architecture is a rewrite by Jeremy Bennett of the old GDB 5.3 interface to make use of gdbarch for GDB 6.8. The code tries to follow the GDB coding style. Commenting is Doxygen compatible. Much has been stripped out in the interests of getting a basic working system. This is described as the OpenRISC 1000 target architecture, so should work with 16, 32 and 64 bit versions of that architecture and should work whether or not they have floating point and/or vector registers. There was never a capability to run simulator commands (no remote target implemented the required function), so that has been removed. The info trace command has been removed. The meaning of this is not clear - it relies on a value in register 255 of the debug group, which is undocumented. All the hardware trace has been removed for the time being. The new debug interface does not support hardware trace, so there is no plan to reinstate this functionality. Support for multiple contexts (which was rudimentary, and not working) has been removed. */ /*---------------------------------------------------------------------------*/ #include "demangle.h" #include "defs.h" #include "gdb_string.h" #include "frame.h" #include "inferior.h" #include "symtab.h" #include "value.h" #include "gdbcmd.h" #include "language.h" #include "gdbcore.h" #include "symfile.h" #include "objfiles.h" #include "gdbtypes.h" #include "target.h" #include "regcache.h" #include "opcode/or32.h" #include "or1k-tdep.h" #include "safe-ctype.h" #include "block.h" #include "reggroups.h" #include "arch-utils.h" #include "frame.h" #include "frame-unwind.h" #include "frame-base.h" #include "dwarf2-frame.h" #include "trad-frame.h" #include <inttypes.h> /* Support functions for the architecture definition */ /*----------------------------------------------------------------------------*/ /*!Get an instruction from a frame This reads from memory, but if the instruction has been substituted by a software breakpoint, returns the instruction that has been replaced, NOT the break point instruction Depending on whether this has a frame available we use a frame based memory access or independent memory access. Underneath they are both the same, but annoyingly save_frame_unwind_memory inverts the status returned! @param[in] next_frame Information about the next frame. @param[in] addr Address from which to get the instruction @return The instruction */ /*---------------------------------------------------------------------------*/ static unsigned long int or1k_fetch_instruction (struct frame_info *next_frame, CORE_ADDR addr) { char buf[OR1K_INSTLEN]; int status; struct frame_info *this_frame = get_prev_frame (next_frame); if (NULL == this_frame) { status = read_memory_nobpt (addr, buf, OR1K_INSTLEN); } else { status = !(safe_frame_unwind_memory (this_frame, addr, buf, OR1K_INSTLEN)); } if (0 != status) { memory_error (status, addr); } return (unsigned long int)(extract_unsigned_integer (buf, OR1K_INSTLEN)); } /* or1k_fetch_instruction() */ /*----------------------------------------------------------------------------*/ /*!Store an instruction in a frame This writes to memory. Unlike its counterpart to fetch the instruction it does nothing about breakpoints Depending on whether this has a frame available we use a frame based memory access or independent memory access. @param[in] next_frame Information about the next frame. Here for compatibility with the fetch function, but ignored. @param[in] addr Address to which to put the instruction @param[in] insn The instruction to be written */ /*---------------------------------------------------------------------------*/ static void or1k_store_instruction (struct frame_info *next_frame, CORE_ADDR addr, unsigned long int insn) { write_memory_unsigned_integer( addr, sizeof( insn ), insn ); } /* or1k_store_instruction() */ /*---------------------------------------------------------------------------*/ /*!Generic function to read bits from an instruction printf style. Basic syntax or1k_analyse_inst (inst, format, &arg1, &arg2 ...) Format string can contain the following characters: - SPACE: Ignored, just for layout - 0: Match with a zero bit - 1: Match with a one bit - %<n>b: Match <n> bits to the next argument (n decimal) If the arg corresponding to a bit field is non-null, the value will be assigned to that argument (using NULL allows fields to be skipped). Any bad string will cause a fatal error. These are constant strings, so should be correct. The bit field must be 32 bits long. A failure here will cause a fatal error for the same reason. @note The format string is presented MS field to LS field, left to right. This means that it is read lowest numbered char first. @note Some of the arg fields may be populated, even if recognition ultimately fails. @param[in] inst The instruction to analyse @param[in] format The format string @param[out] ... Argument fields @return 1 (TRUE) if the instruction matches, 0 (FALSE) otherwise. */ /*---------------------------------------------------------------------------*/ static int or1k_analyse_inst (uint32_t inst, const char *format, ...) { /* Break out each field in turn, validating as we go. */ va_list ap; int i; int iptr = 0; /* Instruction pointer */ va_start (ap, format); for (i = 0; 0 != format[i];) { const char *start_ptr; char *end_ptr; uint32_t bits; /* Bit substring of interest */ uint32_t width; /* Substring width */ uint32_t *arg_ptr; switch (format[i]) { case ' ': i++; break; /* Formatting: ignored */ case '0': case '1': /* Constant bit field */ bits = (inst >> (OR1K_INSTBITLEN - iptr - 1)) & 0x1; if ((format[i] - '0') != bits) { return 0; } iptr++; i++; break; case '%': /* Bit field */ i++; start_ptr = &(format[i]); width = strtoul (start_ptr, &end_ptr, 10); /* Check we got something, and if so skip on */ if (start_ptr == end_ptr) { fatal ("bitstring \"%s\" at offset %d has no length field.\n", format, i); } i += end_ptr - start_ptr; /* Look for and skip the terminating 'b'. If it's not there, we still give a fatal error, because these are fixed strings that just should not be wrong. */ if ('b' != format[i++]) { fatal ("bitstring \"%s\" at offset %d has no terminating 'b'.\n", format, i); } /* Break out the field. There is a special case with a bit width of 32. */ if (32 == width) { bits = inst; } else { bits = (inst >> (OR1K_INSTBITLEN - iptr - width)) & ((1 << width) - 1); } arg_ptr = va_arg (ap, uint32_t *); *arg_ptr = bits; iptr += width; break; default: fatal ("invalid character in bitstring \"%s\" at offset %d.\n", format, i); break; } } /* Is the length OK? */ gdb_assert (OR1K_INSTBITLEN == iptr); return 1; /* We succeeded */ } /* or1k_analyse_inst () */ /*---------------------------------------------------------------------------*/ /*!Analyse a l.addi instruction General form is: l.addi rD,rA,I Makes use of the generic analysis function (@see or1k_analyse_inst ()). @param[in] inst The instruction to analyse. @param[out] rd_ptr Pointer to the rD value. @param[out] ra_ptr Pointer to the rA value. @param[out] simm_ptr Pointer to the signed immediate value. @return 1 (TRUE) if the instruction matches, 0 (FALSE) otherwise. */ /*---------------------------------------------------------------------------*/ static int or1k_analyse_l_addi (uint32_t inst, unsigned int *rd_ptr, unsigned int *ra_ptr, int *simm_ptr) { /* Instruction fields */ uint32_t rd, ra, i; if (or1k_analyse_inst (inst, "10 0111 %5b %5b %16b", &rd, &ra, &i)) { /* Found it. Construct the result fields */ *rd_ptr = (unsigned int) rd; *ra_ptr = (unsigned int) ra; *simm_ptr = (int) (((i & 0x8000) == 0x8000) ? 0xffff0000 | i : i); return 1; /* Success */ } else { return 0; /* Failure */ } } /* or1k_analyse_l_addi () */ /*---------------------------------------------------------------------------*/ /*!Analyse a l.sw instruction General form is: l.sw I(rA),rB Makes use of the generic analysis function (@see or1k_analyse_inst ()). @param[in] inst The instruction to analyse. @param[out] simm_ptr Pointer to the signed immediate value. @param[out] ra_ptr Pointer to the rA value. @param[out] rb_ptr Pointer to the rB value. @return 1 (TRUE) if the instruction matches, 0 (FALSE) otherwise. */ /*---------------------------------------------------------------------------*/ static int or1k_analyse_l_sw (uint32_t inst, int *simm_ptr, unsigned int *ra_ptr, unsigned int *rb_ptr) { /* Instruction fields */ uint32_t ihi, ilo, ra, rb; if (or1k_analyse_inst (inst, "11 0101 %5b %5b %5b %11b", &ihi, &ra, &rb, &ilo)) { /* Found it. Construct the result fields */ *simm_ptr = (int) ((ihi << 11) | ilo); *simm_ptr |= ((ihi & 0x10) == 0x10) ? 0xffff0000 : 0; *ra_ptr = (unsigned int) ra; *rb_ptr = (unsigned int) rb; return 1; /* Success */ } else { return 0; /* Failure */ } } /* or1k_analyse_l_sw () */ /* Functions defining the architecture */ /*----------------------------------------------------------------------------*/ /*!Determine the return convention used for a given type Optionally, fetch or set the return value via "readbuf" or "writebuf" respectively using "regcache" for the register values. The OpenRISC 1000 returns scalar values via R11 and (for 64 bit values on 32 bit architectures) R12. Structs and unions are returned by reference, with the address in R11 Throughout use read_memory(), not target_read_memory(), since the address may be invalid and we want an error reported (read_memory() is target_read_memory() with error reporting). @todo This implementation is labelled OR1K, but in fact is just for the 32 bit version, OR32. This should be made explicit @param[in] gdbarch The GDB architecture being used @param[in] type The type of the entity to be returned @param[in] regcache The register cache @param[in] readbuf Buffer into which the return value should be written @param[out] writebuf Buffer from which the return value should be written @return The type of return value */ /*---------------------------------------------------------------------------*/ static enum return_value_convention or1k_return_value (struct gdbarch *gdbarch, struct type *type, struct regcache *regcache, gdb_byte *readbuf, const gdb_byte *writebuf) { enum type_code rv_type = TYPE_CODE (type); unsigned int rv_size = TYPE_LENGTH (type); ULONGEST tmp; /* Deal with struct/union and large scalars first. Large (> 4 byte) scalars are returned via a pointer (despite what is says in the architecture document). Result pointed to by R11 */ if((TYPE_CODE_STRUCT == rv_type) || (TYPE_CODE_UNION == rv_type) || (rv_size > 4)) { if (readbuf) { regcache_cooked_read_unsigned (regcache, OR1K_RV_REGNUM, &tmp); read_memory (tmp, readbuf, rv_size); } if (writebuf) { regcache_cooked_read_unsigned (regcache, OR1K_RV_REGNUM, &tmp); write_memory (tmp, writebuf, rv_size); } return RETURN_VALUE_ABI_RETURNS_ADDRESS; } /* 1-4 byte scalars are returned in R11 */ if (readbuf) { regcache_cooked_read_unsigned (regcache, OR1K_RV_REGNUM, &tmp); store_unsigned_integer (readbuf, rv_size, tmp); } if (writebuf) { gdb_byte buf[4]; memset (buf, 0, sizeof (buf)); /* Pad with zeros if < 4 bytes */ if (BFD_ENDIAN_BIG == gdbarch_byte_order (gdbarch)) { memcpy (buf + sizeof (buf) - rv_size, writebuf, rv_size); } else { memcpy (buf, writebuf, rv_size); } regcache_cooked_write (regcache, OR1K_RV_REGNUM, buf); } return RETURN_VALUE_REGISTER_CONVENTION; } /* or1k_return_value() */ /*----------------------------------------------------------------------------*/ /*!Determine the instruction to use for a breakpoint. Given the address at which to insert a breakpoint (bp_addr), what will that breakpoint be? For or1k, we have a breakpoint instruction. Since all or1k instructions are 32 bits, this is all we need, regardless of address. @param[in] gdbarch The GDB architecture being used @param[in] bp_addr The breakpoint address in question @param[out] bp_size The size of instruction selected @return The chosen breakpoint instruction */ /*---------------------------------------------------------------------------*/ static const gdb_byte * or1k_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *bp_addr, int *bp_size) { static const gdb_byte breakpoint[] = OR1K_BRK_INSTR_STRUCT; *bp_size = OR1K_INSTLEN; return breakpoint; } /* or1k_breakpoint_from_pc() */ /*----------------------------------------------------------------------------*/ /*!Determine if we are executing a delay slot Looks at the instruction at the previous instruction to see if it was one with a delay slot. @param[in] gdbarch The GDB architecture being used @param[in] this_frame Information about THIS frame @return 1 (true) if this instruction is executing a delay slot, 0 (false) otherwise. */ /*--------------------------------------------------------------------------*/ static int or1k_single_step_through_delay( struct gdbarch *gdbarch, struct frame_info *this_frame ) { struct regcache *regcache = get_current_regcache (); ULONGEST val; CORE_ADDR ppc; int index; /* Get and decode the previous instruction. */ regcache_cooked_read_unsigned (regcache, OR1K_PPC_REGNUM, &val); ppc = (CORE_ADDR)val; index = insn_decode (or1k_fetch_instruction (this_frame, ppc)); /* We are only executing a delay slot if the previous instruction was a branch or jump. */ return or32_opcodes[index].flags & OR32_IF_DELAY; } /* or1k_single_step_through_delay() */ /*----------------------------------------------------------------------------*/ /*!Read a pseudo register Since we have no pseudo registers this is a null function for now. @todo The floating point and vector registers ought to be done as pseudo-registers. @param[in] gdbarch The GDB architecture to consider @param[in] regcache The cached register values as an array @param[in] regnum The register to read @param[out] buf A buffer to put the result in */ /*---------------------------------------------------------------------------*/ static void or1k_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache, int regnum, gdb_byte *buf) { return; } /* or1k_pseudo_register_read() */ /*----------------------------------------------------------------------------*/ /*!Write a pseudo register Since we have no pseudo registers this is a null function for now. @todo The floating point and vector registers ought to be done as pseudo-registers. @param[in] gdbarch The GDB architecture to consider @param[in] regcache The cached register values as an array @param[in] regnum The register to read @param[in] buf A buffer with the value to write */ /*---------------------------------------------------------------------------*/ static void or1k_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache, int regnum, const gdb_byte *buf) { return; } /* or1k_pseudo_register_write() */ /*----------------------------------------------------------------------------*/ /*!Return the register name for the OpenRISC 1000 architecture This version converted to ANSI C, made static and incorporates the static table of register names (this is the only place it is referenced). @todo The floating point and vector registers ought to be done as pseudo-registers. @param[in] gdbarch The GDB architecture being used @param[in] regnum The register number @return The textual name of the register */ /*---------------------------------------------------------------------------*/ static const char * or1k_register_name (struct gdbarch *gdbarch, int regnum) { static char *or1k_gdb_reg_names[OR1K_TOTAL_NUM_REGS] = { /* general purpose registers */ "gpr0", "gpr1", "gpr2", "gpr3", "gpr4", "gpr5", "gpr6", "gpr7", "gpr8", "gpr9", "gpr10", "gpr11", "gpr12", "gpr13", "gpr14", "gpr15", "gpr16", "gpr17", "gpr18", "gpr19", "gpr20", "gpr21", "gpr22", "gpr23", "gpr24", "gpr25", "gpr26", "gpr27", "gpr28", "gpr29", "gpr30", "gpr31", /* previous program counter, next program counter and status register */ "ppc", "npc", "sr" /* Floating point and vector registers may appear as pseudo registers in the future. */ }; return or1k_gdb_reg_names[regnum]; } /* or1k_register_name() */ /*----------------------------------------------------------------------------*/ /*!Identify the type of a register @todo I don't fully understand exactly what this does, but I think this makes sense! @param[in] arch The GDB architecture to consider @param[in] regnum The register to identify @return The type of the register */ /*---------------------------------------------------------------------------*/ static struct type * or1k_register_type (struct gdbarch *arch, int regnum) { static struct type *void_func_ptr = NULL; static struct type *void_ptr = NULL; /* Set up the static pointers once, the first time*/ if (NULL == void_func_ptr) { void_ptr = lookup_pointer_type (builtin_type_void); void_func_ptr = lookup_pointer_type (lookup_function_type (builtin_type_void)); } if((regnum >= 0) && (regnum < OR1K_TOTAL_NUM_REGS)) { switch (regnum) { case OR1K_PPC_REGNUM: case OR1K_NPC_REGNUM: return void_func_ptr; /* Pointer to code */ case OR1K_SP_REGNUM: case OR1K_FP_REGNUM: return void_ptr; /* Pointer to data */ default: return builtin_type_int32; /* Data */ } } internal_error (__FILE__, __LINE__, _("or1k_register_type: illegal register number %d"), regnum); } /* or1k_register_type() */ /*----------------------------------------------------------------------------*/ /*!Handle the "info register" command Print the identified register, unless it is -1, in which case print all the registers. If all is 1 means all registers, otherwise only the core GPRs. @todo At present all registers are printed with the default method. Should there be something special for FP registers? @param[in] gdbarch The GDB architecture being used @param[in] file File handle for use with any custom I/O @param[in] frame Frame info for use with custom output @param[in] regnum Register of interest, or -1 if all registers @param[in] all 1 if all means all, 0 if all means just GPRs @return The aligned stack frame address */ /*---------------------------------------------------------------------------*/ static void or1k_registers_info (struct gdbarch *gdbarch, struct ui_file *file, struct frame_info *frame, int regnum, int all) { if (-1 == regnum) { /* Do all (valid) registers */ unsigned int lim = all ? OR1K_NUM_REGS : OR1K_MAX_GPR_REGS; for (regnum = 0; regnum < lim; regnum++) { if ('\0' != *(or1k_register_name (gdbarch, regnum))) { or1k_registers_info (gdbarch, file, frame, regnum, all); } } } else { /* Do one specified register - if it is part of this architecture */ if ('\0' == *(or1k_register_name (gdbarch, regnum))) { error ("Not a valid register for the current processor type"); } else { default_print_registers_info (gdbarch, file, frame, regnum, all); } } } /* or1k_registers_info() */ /*----------------------------------------------------------------------------*/ /*!Identify if a register belongs to a specified group Return true if the specified register is a member of the specified register group. These are the groups of registers that can be displayed via "info reg". @todo The Vector and Floating Point registers ought to be displayed as pseudo-registers. @param[in] gdbarch The GDB architecture to consider @param[in] regnum The register to consider @param[in] group The group to consider @return True (1) if regnum is a member of group */ /*---------------------------------------------------------------------------*/ static int or1k_register_reggroup_p (struct gdbarch *gdbarch, int regnum, struct reggroup *group) { struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); /* All register group */ if (group == all_reggroup) { return ((regnum >= 0) && (regnum < OR1K_TOTAL_NUM_REGS) && (or1k_register_name (gdbarch, regnum)[0] != '\0')); } /* For now everything except the PC */ if (group == general_reggroup) { return ((regnum >= OR1K_ZERO_REGNUM) && (regnum < tdep->num_gpr_regs) && (regnum != OR1K_PPC_REGNUM) && (regnum != OR1K_NPC_REGNUM)); } if (group == float_reggroup) { return 0; /* No float regs. */ } if (group == vector_reggroup) { return 0; /* No vector regs. */ } /* For any that are not handled above. */ return default_register_reggroup_p (gdbarch, regnum, group); } /* or1k_register_reggroup_p() */ /*----------------------------------------------------------------------------*/ /*!Skip a function prolog If the input address, PC, is in a function prologue, return the address of the end of the prologue, otherwise return the input address. @see For details of the stack frame, see the function or1k_frame_unwind_cache(). This function reuses the helper functions from or1k_frame_unwind_cache() to locate the various parts of the prolog, any or all of which may be missing. @param[in] gdbarch The GDB architecture being used @param[in] pc Current program counter @return The address of the end of the prolog if the PC is in a function prologue, otherwise the input address. */ /*----------------------------------------------------------------------------*/ static CORE_ADDR or1k_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc) { CORE_ADDR addr; uint32_t inst; unsigned int ra, rb, rd; /* For instruction analysis */ int simm; int frame_size = 0; /* Try using SAL first if we have symbolic information available. */ if (find_pc_partial_function (pc, NULL, NULL, NULL)) { CORE_ADDR prologue_end = skip_prologue_using_sal( pc ); return (prologue_end > pc) ? prologue_end : pc; } /* Look to see if we can find any of the standard prologue sequence. All quite difficult, since any or all of it may be missing. So this is just a best guess! */ addr = pc; /* Where we have got to */ inst = or1k_fetch_instruction (NULL, addr); /* Look for the new stack pointer being set up. */ if (or1k_analyse_l_addi (inst, &rd, &ra, &simm) && (OR1K_SP_REGNUM == rd) && (OR1K_SP_REGNUM == ra) && (simm < 0) && (0 == (simm % 4))) { frame_size = -simm; addr += OR1K_INSTLEN; inst = or1k_fetch_instruction (NULL, addr); } /* Look for the frame pointer being manipulated. */ if (or1k_analyse_l_sw (inst, &simm, &ra, &rb) && (OR1K_SP_REGNUM == ra) && (OR1K_FP_REGNUM == rb) && (simm >= 0) && (0 == (simm % 4))) { addr += OR1K_INSTLEN; inst = or1k_fetch_instruction (NULL, addr); gdb_assert (or1k_analyse_l_addi (inst, &rd, &ra, &simm) && (OR1K_FP_REGNUM == rd) && (OR1K_SP_REGNUM == ra) && (simm == frame_size)); addr += OR1K_INSTLEN; inst = or1k_fetch_instruction (NULL, addr); } /* Look for the link register being saved */ if (or1k_analyse_l_sw (inst, &simm, &ra, &rb) && (OR1K_SP_REGNUM == ra) && (OR1K_LR_REGNUM == rb) && (simm >= 0) && (0 == (simm % 4))) { addr += OR1K_INSTLEN; inst = or1k_fetch_instruction (NULL, addr); } /* Look for callee-saved register being saved. The register must be one of the 10 callee saved registers (r10, r12, r14, r16, r18, r20, r22, r24, r26, r28, r30).*/ while (1) { if (or1k_analyse_l_sw (inst, &simm, &ra, &rb) && (OR1K_SP_REGNUM == ra) && (rb >= OR1K_FIRST_SAVED_REGNUM) && (0 == rb % 2) && (simm >= 0) && (0 == (simm % 4))) { addr += OR1K_INSTLEN; inst = or1k_fetch_instruction (NULL, addr); } else { /* Nothing else to look for. We have found the end of the prologue. */ return addr; } } } /* or1k_skip_prologue() */ /*----------------------------------------------------------------------------*/ /*!Align the stack frame OpenRISC 1000 uses a falling stack frame, so this aligns down to the nearest 8 bytes. Useful when we'be building a dummy frame. @param[in] gdbarch The GDB architecture being used @param[in] sp Current stack pointer @return The aligned stack frame address */ /*---------------------------------------------------------------------------*/ static CORE_ADDR or1k_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp) { return align_down (sp, OR1K_STACK_ALIGN); } /* or1k_frame_align() */ /*----------------------------------------------------------------------------*/ /*!Unwind the program counter from a stack frame This just uses the built in frame unwinder @param[in] gdbarch The GDB architecture being used @param[in] next_frame Frame info for the NEXT frame @return The program counter for THIS frame */ /*---------------------------------------------------------------------------*/ static CORE_ADDR or1k_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) { CORE_ADDR pc = frame_unwind_register_unsigned (next_frame, OR1K_NPC_REGNUM); return pc; } /* or1k_unwind_pc() */ /*----------------------------------------------------------------------------*/ /*!Unwind the stack pointer from a stack frame This just uses the built in frame unwinder @param[in] gdbarch The GDB architecture being used @param[in] next_frame Frame info for the NEXT frame @return The stack pointer for THIS frame */ /*---------------------------------------------------------------------------*/ static CORE_ADDR or1k_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame) { CORE_ADDR sp = frame_unwind_register_unsigned (next_frame, OR1K_SP_REGNUM); return sp; } /* or1k_unwind_sp() */ /*----------------------------------------------------------------------------*/ /*!Create a dummy stack frame The arguments are placed in registers and/or pushed on the stack as per the OR1K ABI. @param[in] gdbarch The architecture to use @param[in] function Pointer to the function that will be called @param[in] regcache The register cache to use @param[in] bp_addr Breakpoint address @param[in] nargs Number of ags to push @param[in] args The arguments @param[in] sp The stack pointer @param[in] struct_return True (1) if this returns a structure @param[in] struct_addr Address for returning structures @return The updated stack pointer */ /*---------------------------------------------------------------------------*/ static CORE_ADDR or1k_push_dummy_call (struct gdbarch *gdbarch, struct value *function, struct regcache *regcache, CORE_ADDR bp_addr, int nargs, struct value **args, CORE_ADDR sp, int struct_return, CORE_ADDR struct_addr) { int argreg; int argnum; int first_stack_arg; int stack_offset = 0; unsigned int bpa = (gdbarch_tdep (gdbarch))->bytes_per_address; unsigned int bpw = (gdbarch_tdep (gdbarch))->bytes_per_word; /* Return address */ regcache_cooked_write_unsigned (regcache, OR1K_LR_REGNUM, bp_addr); /* Register for the next argument */ argreg = OR1K_FIRST_ARG_REGNUM; /* Location for a returned structure. This is passed as a silent first argument. */ if (struct_return) { regcache_cooked_write_unsigned (regcache, OR1K_FIRST_ARG_REGNUM, struct_addr); argreg++; } /* Put as many args as possible in registers */ for (argnum = 0; argnum < nargs; argnum++) { char *val; char valbuf[sizeof (ULONGEST) ]; struct value *arg = args[argnum]; struct type *arg_type = check_typedef (value_type (arg)); int len = arg_type->length; enum type_code typecode = arg_type->main_type->code; /* The EABI passes structures that do not fit in a register by reference. In all other cases, pass the structure by value. */ if((len > bpw) && ((TYPE_CODE_STRUCT == typecode) || (TYPE_CODE_UNION == typecode))) { store_unsigned_integer (valbuf, bpa, value_offset (arg)); len = bpa; val = valbuf; } else { val = (char *)value_contents (arg); } if((len > bpw) && (argreg <= (OR1K_LAST_ARG_REGNUM - 1))) { /* Big scalars use two registers, must be pair aligned. This code breaks if we can have quad-word scalars (e.g. long double). */ ULONGEST regval = extract_unsigned_integer (val, len); gdb_assert (len <= (bpw * 2)); argreg = 1 == (argreg & 1) ? argreg + 1 : argreg; regcache_cooked_write_unsigned (regcache, argreg, regval >> bpw); regcache_cooked_write_unsigned (regcache, argreg + 1, regval && ((ULONGEST)(1 << bpw) - 1)); argreg += 2; } else if (argreg <= OR1K_LAST_ARG_REGNUM) { regcache_cooked_write_unsigned (regcache, argreg, extract_unsigned_integer (val, len)); argreg++; } else { /* Run out of regs */ break; } } first_stack_arg = argnum; /* If we get here with argnum < nargs, then arguments remain to be placed on the stack. This is tricky, since they must be pushed in reverse order and the stack in the end must be aligned. The only solution is to do it in two stages, the first to compute the stack size, the second to save the args. */ for (argnum = first_stack_arg; argnum < nargs; argnum++) { struct value *arg = args[argnum]; struct type *arg_type = check_typedef (value_type (arg)); int len = arg_type->length; enum type_code typecode = arg_type->main_type->code; if((len > bpw) && ((TYPE_CODE_STRUCT == typecode) || (TYPE_CODE_UNION == typecode))) { /* Large structures are passed as addresses */ sp -= bpa; } else { /* Big scalars use more than one word. Code here allows for future quad-word entities (e.g. long double) */ sp -= ((len + bpw - 1) / bpw) * bpw; } } sp = gdbarch_frame_align (gdbarch, sp); stack_offset = 0; /* Push the remaining args on the stack */ for (argnum = first_stack_arg; argnum < nargs; argnum++) { char *val; char valbuf[sizeof (ULONGEST) ]; struct value *arg = args[argnum]; struct type *arg_type = check_typedef (value_type (arg)); int len = arg_type->length; enum type_code typecode = arg_type->main_type->code; /* The EABI passes structures that do not fit in a register by reference. In all other cases, pass the structure by value. */ if((len > bpw) && ((TYPE_CODE_STRUCT == typecode) || (TYPE_CODE_UNION == typecode))) { store_unsigned_integer (valbuf, bpa, value_offset (arg)); len = bpa; val = valbuf; } else { val = (char *)value_contents (arg); } gdb_assert (len <= (bpw * 2)); write_memory (sp + stack_offset, val, len); stack_offset += ((len + bpw - 1) / bpw) * bpw; } /* Save the updated stack pointer */ regcache_cooked_write_unsigned (regcache, OR1K_SP_REGNUM, sp); return sp; } /* or1k_push_dummy_call() */ /*----------------------------------------------------------------------------*/ /*!Unwind a dummy stack frame Tear down a dummy frame created by or1k_push_dummy_call(). This data has to be constructed manually from the data in our hand. The frame_id info in next_frame is not complete, and a call to unwind it will just recurse to us (we think). The stack pointer and program counter can be unwound. From the program counter, the start of the function can be determined. @param[in] gdbarch The architecture to use @param[in] next_frame Information about the next frame @return Frame ID of the preceding frame */ /*---------------------------------------------------------------------------*/ static struct frame_id or1k_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame) { CORE_ADDR this_sp = gdbarch_unwind_sp (gdbarch, next_frame); CORE_ADDR this_pc = gdbarch_unwind_pc (gdbarch, next_frame); CORE_ADDR start_addr; CORE_ADDR end_addr; /* Try using SAL to find the true function start. Otherwise the PC will have to be a proxy for the start of the function. */ if (find_pc_partial_function (this_pc, NULL, &start_addr, &end_addr)) { return frame_id_build (this_sp, start_addr); } else { return frame_id_build (this_sp, this_pc); } } /* or1k_unwind_dummy_id() */ /* Support functions for frame handling */ /*----------------------------------------------------------------------------*/ /*!Initialize a prologue (unwind) cache Build up the information (saved registers etc) for the given frame if it does not already exist. STACK FORMAT ============ The OR1K has a falling stack frame and a simple prolog. The Stack pointer is R1 and the frame pointer R2. The frame base is therefore the address held in R2 and the stack pointer (R1) is the frame base of the NEXT frame. @verbatim l.addi r1,r1,-frame_size # SP now points to end of new stack frame @endverbatim The stack pointer may not be set up in a frameless function (e.g. a simple leaf function). @verbatim l.sw fp_loc(r1),r2 # old FP saved in new stack frame l.addi r2,r1,frame_size # FP now points to base of new stack frame @endverbatim The frame pointer is not necessarily saved right at the end of the stack frame - OR1K saves enough space for any args to called functions right at the end (this is a difference from the Architecture Manual). @verbatim l.sw lr_loc(r1),r9 # Link (return) address @endverbatim The link register is usally saved at fp_loc - 4. It may not be saved at all in a leaf function. @verbatim l.sw reg_loc(r1),ry # Save any callee saved regs @endverbatim The offsets x for the callee saved registers generally (always?) rise in increments of 4, starting at fp_loc + 4. If the frame pointer is omitted (an option to GCC), then it may not be saved at all. There may be no callee saved registers. So in summary none of this may be present. However what is present seems always to follow this fixed order, and occur before any substantive code (it is possible for GCC to have more flexible scheduling of the prologue, but this does not seem to occur for OR1K). ANALYSIS ======== This prolog is used, even for -O3 with GCC. All this analysis must allow for the possibility that the PC is in the middle of the prologue. Data should only be set up insofar as it has been computed. A suite of "helper" routines are used, allowing reuse for or1k_skip_prologue(). Reportedly, this is only valid for frames less than 0x7fff in size. @param[in] next_frame The NEXT frame (i.e. inner from here, the one THIS frame called) @param[in,out] this_prologue_cache The prologue cache. If not supplied, we build it. @return The prolog cache (duplicates the return through the argument) */ /*---------------------------------------------------------------------------*/ static struct trad_frame_cache * or1k_frame_unwind_cache (struct frame_info *next_frame, void **this_prologue_cache) { struct gdbarch *gdbarch; struct trad_frame_cache *info; CORE_ADDR this_pc; CORE_ADDR this_sp; int frame_size = 0; CORE_ADDR start_addr; CORE_ADDR end_addr; /* Nothing to do if we already have this info */ if (NULL != *this_prologue_cache) { return *this_prologue_cache; } /* Get a new prologue cache and populate it with default values */ info = trad_frame_cache_zalloc (next_frame); *this_prologue_cache = info; /* Find the start address of THIS function (which is a NORMAL frame, even if the NEXT frame is the sentinel frame) and the end of its prologue. */ start_addr = frame_func_unwind (next_frame, NORMAL_FRAME); /* Return early if GDB couldn't find the function. */ if (start_addr == 0) { return info; } /* Unwind key registers for THIS frame. */ gdbarch = get_frame_arch (next_frame); this_pc = or1k_unwind_pc (gdbarch, next_frame); this_sp = or1k_unwind_sp (gdbarch, next_frame); /* The frame base of THIS frame is its stack pointer. This is the same whether we are frameless or not. */ trad_frame_set_this_base (info, this_sp); /* The default is to find the PC of the PREVIOUS frame in the link register of this frame. This may be changed if we find the link register was saved on the stack. */ trad_frame_set_reg_realreg (info, OR1K_NPC_REGNUM, OR1K_LR_REGNUM); /* We should only examine code that is in the prologue and which has been executed. This is all code up to (but not including) end_addr or the PC, whichever is first. */ end_addr = or1k_skip_prologue (gdbarch, start_addr); end_addr = (this_pc > end_addr) ? end_addr : this_pc; /* All the following analysis only occurs if we are in the prologue and have executed the code. Check we have a sane prologue size, and if zero we are frameless and can give up here. */ if (end_addr < start_addr) { fatal ("end addr 0x%08x is less than start addr 0x%08x\n", (unsigned int) end_addr, (unsigned int) start_addr); } if (end_addr == start_addr) { frame_size = 0; } else { /* have a frame. Look for the various components */ CORE_ADDR addr = start_addr; /* Where we have got to */ uint32_t inst = or1k_fetch_instruction (next_frame, addr); unsigned int ra, rb, rd; /* For instruction analysis */ int simm; /* Look for the new stack pointer being set up. */ if (or1k_analyse_l_addi (inst, &rd, &ra, &simm) && (OR1K_SP_REGNUM == rd) && (OR1K_SP_REGNUM == ra) && (simm < 0) && (0 == (simm % 4))) { frame_size = -simm; addr += OR1K_INSTLEN; inst = or1k_fetch_instruction (next_frame, addr); /* The stack pointer of the PREVIOUS frame is frame_size greater than the stack pointer of THIS frame. */ trad_frame_set_reg_value (info, OR1K_SP_REGNUM, this_sp + frame_size); } /* Look for the frame pointer being manipulated. */ if ((addr < end_addr) && or1k_analyse_l_sw (inst, &simm, &ra, &rb) && (OR1K_SP_REGNUM == ra) && (OR1K_FP_REGNUM == rb) && (simm >= 0) && (0 == (simm % 4))) { addr += OR1K_INSTLEN; inst = or1k_fetch_instruction (next_frame, addr); /* At this stage, we can find the frame pointer of the PREVIOUS frame on the stack of the current frame. */ trad_frame_set_reg_addr (info, OR1K_FP_REGNUM, this_sp + simm); /* Look for the new frame pointer being set up */ if (addr < end_addr) { gdb_assert (or1k_analyse_l_addi (inst, &rd, &ra, &simm) && (OR1K_FP_REGNUM == rd) && (OR1K_SP_REGNUM == ra) && (simm == frame_size)); addr += OR1K_INSTLEN; inst = or1k_fetch_instruction (next_frame, addr); /* If we have got this far, the stack pointer of the PREVIOUS frame is the frame pointer of THIS frame. */ trad_frame_set_reg_realreg (info, OR1K_SP_REGNUM, OR1K_FP_REGNUM); } } /* Look for the link register being saved */ if ((addr < end_addr) && or1k_analyse_l_sw (inst, &simm, &ra, &rb) && (OR1K_SP_REGNUM == ra) && (OR1K_LR_REGNUM == rb) && (simm >= 0) && (0 == (simm % 4))) { addr += OR1K_INSTLEN; inst = or1k_fetch_instruction (next_frame, addr); /* If the link register is saved in the THIS frame, it holds the value of the PC in the PREVIOUS frame. This overwrites the previous information about finding the PC in the link register. */ trad_frame_set_reg_addr (info, OR1K_NPC_REGNUM, this_sp + simm); } /* Look for callee-saved register being save. The register must be one of the 10 callee saved registers (r10, r12, r14, r16, r18, r20, r22, r24, r26, r28, r30).*/ while (addr < end_addr) { if (or1k_analyse_l_sw (inst, &simm, &ra, &rb) && (OR1K_SP_REGNUM == ra) && (rb >= OR1K_FIRST_SAVED_REGNUM) && (0 == rb % 2) && (simm >= 0) && (0 == (simm % 4))) { addr += OR1K_INSTLEN; inst = or1k_fetch_instruction (next_frame, addr); /* The register in the PREVIOUS frame can be found at this location in THIS frame */ trad_frame_set_reg_addr (info, rb, this_sp + simm); } else { break; /* Not a register save instruction */ } } } /* Build the frame ID */ trad_frame_set_id (info, frame_id_build (this_sp, start_addr)); return info; } /* or1k_frame_unwind_cache() */ /*----------------------------------------------------------------------------*/ /*!Find the frame ID of this frame Given a GDB frame (called by THIS frame), determine the address of oru frame and from this create a new GDB frame struct. The info required is obtained from the prologue cache for THIS frame. @param[in] next_frame The NEXT frame (i.e. inner from here, the one THIS frame called) @param[in] this_prologue_cache Any cached prologue for THIS function. @param[out] this_id Frame ID of our own frame. @return Frame ID for THIS frame */ /*---------------------------------------------------------------------------*/ static void or1k_frame_this_id (struct frame_info *next_frame, void **this_prologue_cache, struct frame_id *this_id) { struct trad_frame_cache *info = or1k_frame_unwind_cache (next_frame, this_prologue_cache); trad_frame_get_id (info, this_id); } /* or1k_frame_this_id() */ /*----------------------------------------------------------------------------*/ /*!Get a register from THIS frame Given a pointer to the NEXT frame, return the details of a register in the PREVIOUS frame. @param[in] next_frame The NEXT frame (i.e. inner from here, the one THIS frame called) @param[in] this_prologue_cache Any cached prologue associated with THIS frame, which may therefore tell us about registers in the PREVIOUS frame. @param[in] regnum The register of interest in the PREVIOUS frame @param[out] optimizedp True (1) if the register has been optimized out. @param[out] lvalp What sort of l-value (if any) does the register represent @param[out] addrp Address in THIS frame where the register's value may be found (-1 if not available) @param[out] realregp Register in this frame where the register's value may be found (-1 if not available) @param[out] bufferp If non-NULL, buffer where the value held in the register may be put */ /*--------------------------------------------------------------------------*/ static void or1k_frame_prev_register (struct frame_info *next_frame, void **this_prologue_cache, int regnum, int *optimizedp, enum lval_type *lvalp, CORE_ADDR *addrp, int *realregp, gdb_byte *bufferp) { struct trad_frame_cache *info = or1k_frame_unwind_cache (next_frame, this_prologue_cache); trad_frame_get_register (info, next_frame, regnum, optimizedp, lvalp, addrp, realregp, bufferp); } /* or1k_frame_prev_register() */ /*----------------------------------------------------------------------------*/ /*!Return the base address of the frame The commenting in the GDB source code could mean our stack pointer or our frame pointer, since we have a falling stack, but index within the frame using negative offsets from the FP. This seems to be the function used to determine the value of $fp, but the value required seems to be the stack pointer, so we return that, even if the value of $fp will be wrong. @param[in] next_frame The NEXT frame (i.e. inner from here, the one THIS frame called) @param[in] this_prologue_cache Any cached prologue for THIS function. @return The frame base address */ /*---------------------------------------------------------------------------*/ static CORE_ADDR or1k_frame_base_address (struct frame_info *next_frame, void **this_prologue_cache) { return frame_unwind_register_unsigned (next_frame, OR1K_SP_REGNUM); } /* or1k_frame_base_address() */ /*----------------------------------------------------------------------------*/ /*!The OpenRISC 1000 registered frame sniffer This function just identifies our family of frame sniffing functions. @param[in] next_frame The "next" (i.e. inner, newer from here, the one THIS frame called) frame. @return A pointer to a struct identifying the sniffing functions */ /*---------------------------------------------------------------------------*/ static const struct frame_unwind * or1k_frame_sniffer (struct frame_info *next_frame) { static const struct frame_unwind or1k_frame_unwind = { .type = NORMAL_FRAME, .this_id = or1k_frame_this_id, .prev_register = or1k_frame_prev_register, .unwind_data = NULL, .sniffer = NULL, .prev_pc = NULL, .dealloc_cache = NULL }; return &or1k_frame_unwind; } /* or1k_frame_sniffer() */ /*----------------------------------------------------------------------------*/ /*!Architecture initialization for OpenRISC 1000 Looks for a candidate architecture in the list of architectures supplied using the info supplied. If none match, create a new architecture. @param[in] info Information about the target architecture @param[in] arches The list of currently know architectures @return A structure describing the target architecture */ /*---------------------------------------------------------------------------*/ static struct gdbarch * or1k_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) { static struct frame_base or1k_frame_base; struct gdbarch *gdbarch; struct gdbarch_tdep *tdep; const struct bfd_arch_info *binfo; /* Find a candidate among the list of pre-declared architectures. */ arches = gdbarch_list_lookup_by_info (arches, &info); if (NULL != arches) { return arches->gdbarch; } /* None found, create a new architecture from the information provided. Can't initialize all the target dependencies until we actually know which target we are talking to, but put in some defaults for now. */ binfo = info.bfd_arch_info; tdep = xmalloc (sizeof *tdep); tdep->num_matchpoints = OR1K_MAX_MATCHPOINTS; tdep->num_gpr_regs = OR1K_MAX_GPR_REGS; tdep->bytes_per_word = binfo->bits_per_word / binfo->bits_per_byte; tdep->bytes_per_address = binfo->bits_per_address / binfo->bits_per_byte; gdbarch = gdbarch_alloc (&info, tdep); /* Target data types. */ set_gdbarch_short_bit (gdbarch, 16); set_gdbarch_int_bit (gdbarch, 32); set_gdbarch_long_bit (gdbarch, 32); set_gdbarch_long_long_bit (gdbarch, 64); set_gdbarch_float_bit (gdbarch, 32); set_gdbarch_float_format (gdbarch, floatformats_ieee_single); set_gdbarch_double_bit (gdbarch, 64); set_gdbarch_double_format (gdbarch, floatformats_ieee_double); set_gdbarch_long_double_bit (gdbarch, 64); set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double); set_gdbarch_ptr_bit (gdbarch, binfo->bits_per_address); set_gdbarch_addr_bit (gdbarch, binfo->bits_per_address); set_gdbarch_char_signed (gdbarch, 1); /* Information about the target architecture */ set_gdbarch_return_value (gdbarch, or1k_return_value); set_gdbarch_breakpoint_from_pc (gdbarch, or1k_breakpoint_from_pc); set_gdbarch_single_step_through_delay (gdbarch, or1k_single_step_through_delay); set_gdbarch_have_nonsteppable_watchpoint (gdbarch, 1); switch (gdbarch_byte_order (gdbarch)) { case BFD_ENDIAN_BIG: set_gdbarch_print_insn (gdbarch, print_insn_big_or32); break; case BFD_ENDIAN_LITTLE: set_gdbarch_print_insn (gdbarch, print_insn_little_or32); break; case BFD_ENDIAN_UNKNOWN: error ("or1k_gdbarch_init: Unknown endianism"); break; } /* Register architecture */ set_gdbarch_pseudo_register_read (gdbarch, or1k_pseudo_register_read); set_gdbarch_pseudo_register_write (gdbarch, or1k_pseudo_register_write); set_gdbarch_num_regs (gdbarch, OR1K_NUM_REGS); set_gdbarch_num_pseudo_regs (gdbarch, OR1K_NUM_PSEUDO_REGS); set_gdbarch_sp_regnum (gdbarch, OR1K_SP_REGNUM); set_gdbarch_pc_regnum (gdbarch, OR1K_NPC_REGNUM); set_gdbarch_ps_regnum (gdbarch, OR1K_SR_REGNUM); set_gdbarch_deprecated_fp_regnum (gdbarch, OR1K_FP_REGNUM); /* Functions to supply register information */ set_gdbarch_register_name (gdbarch, or1k_register_name); set_gdbarch_register_type (gdbarch, or1k_register_type); set_gdbarch_print_registers_info (gdbarch, or1k_registers_info); set_gdbarch_register_reggroup_p (gdbarch, or1k_register_reggroup_p); /* Functions to analyse frames */ set_gdbarch_skip_prologue (gdbarch, or1k_skip_prologue); set_gdbarch_inner_than (gdbarch, core_addr_lessthan); set_gdbarch_frame_align (gdbarch, or1k_frame_align); set_gdbarch_frame_red_zone_size (gdbarch, OR1K_FRAME_RED_ZONE_SIZE); /* Functions to access frame data */ set_gdbarch_unwind_pc (gdbarch, or1k_unwind_pc); set_gdbarch_unwind_sp (gdbarch, or1k_unwind_sp); /* Functions handling dummy frames */ set_gdbarch_push_dummy_call (gdbarch, or1k_push_dummy_call); set_gdbarch_unwind_dummy_id (gdbarch, or1k_unwind_dummy_id); /* High level frame base sniffer */ or1k_frame_base.unwind = or1k_frame_sniffer (NULL); or1k_frame_base.this_base = or1k_frame_base_address; or1k_frame_base.this_locals = or1k_frame_base_address; or1k_frame_base.this_args = or1k_frame_base_address; frame_base_set_default (gdbarch, &or1k_frame_base); /* Low level frame sniffers */ frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer); frame_unwind_append_sniffer (gdbarch, or1k_frame_sniffer); return gdbarch; } /* or1k_gdbarch_init() */ /*----------------------------------------------------------------------------*/ /*!Dump the target specific data for this architecture @param[in] gdbarch The architecture of interest @param[in] file Where to dump the data */ /*---------------------------------------------------------------------------*/ static void or1k_dump_tdep (struct gdbarch *gdbarch, struct ui_file *file) { struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); if (NULL == tdep) { return; /* Nothing to report */ } fprintf_unfiltered (file, "or1k_dump_tdep: %d matchpoints available\n", tdep->num_matchpoints); fprintf_unfiltered (file, "or1k_dump_tdep: %d general purpose registers\n", tdep->num_gpr_regs); fprintf_unfiltered (file, "or1k_dump_tdep: %d bytes per word\n", tdep->bytes_per_word); fprintf_unfiltered (file, "or1k_dump_tdep: %d bytes per address\n", tdep->bytes_per_address); } /* or1k_dump_tdep() */ /* Functions to add extra commands to GDB */ /*----------------------------------------------------------------------------*/ /*!Returns a special purpose register group name @param[in] group The SPR group number @return The SPR name (pointer to the name argument) */ /*---------------------------------------------------------------------------*/ static const char * or1k_spr_group_name (int group) { static const char *or1k_group_names[OR1K_NUM_SPGS] = { "SYS", "DMMU", "IMMU", "DCACHE", "ICACHE", "MAC", "DEBUG", "PERF", "POWER", "PIC", "TIMER", "FPU" }; if ((0 <= group) && (group < OR1K_NUM_SPGS)) { return or1k_group_names[group]; } else { return ""; } } /* or1k_spr_group_name() */ /*----------------------------------------------------------------------------*/ /*!Returns a special purpose register name @param[in] group The SPR group @param[in] index The index within the SPR group @param[out] name Array to put the name in @return The SPR name (pointer to the name argument) */ /*---------------------------------------------------------------------------*/ static char * or1k_spr_register_name (int group, int index, char *name) { char di; switch (group) { case OR1K_SPG_SYS: /* 1:1 names */ switch (index) { case OR1K_SPG_SYS_VR: sprintf (name, "VR" ); return name; case OR1K_SPG_SYS_UPR: sprintf (name, "UPR" ); return name; case OR1K_SPG_SYS_CPUCFGR: sprintf (name, "CPUCFGR" ); return name; case OR1K_SPG_SYS_DMMUCFGR: sprintf (name, "DMMUCFGR"); return name; case OR1K_SPG_SYS_IMMUCFGR: sprintf (name, "IMMUCFGR"); return name; case OR1K_SPG_SYS_DCCFGR: sprintf (name, "DCCFGR" ); return name; case OR1K_SPG_SYS_ICCFGR: sprintf (name, "ICCFGR" ); return name; case OR1K_SPG_SYS_DCFGR: sprintf (name, "DCFGR" ); return name; case OR1K_SPG_SYS_PCCFGR: sprintf (name, "PCCFGR" ); return name; case OR1K_SPG_SYS_NPC: sprintf (name, "NPC" ); return name; case OR1K_SPG_SYS_SR: sprintf (name, "SR" ); return name; case OR1K_SPG_SYS_PPC: sprintf (name, "PPC" ); return name; case OR1K_SPG_SYS_FPCSR: sprintf (name, "FPCSR" ); return name; } /* Exception PC regs */ if((OR1K_SPG_SYS_EPCR <= index) && (index <= OR1K_SPG_SYS_EPCR_END)) { sprintf (name, "EPCR%d", index - OR1K_SPG_SYS_EPCR); return name; } /* Exception EA regs */ if((OR1K_SPG_SYS_EEAR <= index) && (index <= OR1K_SPG_SYS_EEAR_END)) { sprintf (name, "EEAR%d", index - OR1K_SPG_SYS_EEAR); return name; } /* Exception SR regs */ if((OR1K_SPG_SYS_ESR <= index) && (index <= OR1K_SPG_SYS_ESR_END)) { sprintf (name, "ESR%d", index - OR1K_SPG_SYS_ESR); return name; } /* GPRs */ if((OR1K_SPG_SYS_GPR <= index) && (index <= OR1K_SPG_SYS_GPR_END)) { sprintf (name, "GPR%d", index - OR1K_SPG_SYS_GPR); return name; } break; case OR1K_SPG_DMMU: case OR1K_SPG_IMMU: /* MMU registers. Use DMMU constants throughout, but these are identical to the corresponding IMMU constants */ di = OR1K_SPG_DMMU == group ? 'D' : 'I'; /* 1:1 names */ switch (index) { case OR1K_SPG_DMMU_DMMUCR: sprintf (name, "%cMMUCR", di); return name; case OR1K_SPG_DMMU_DMMUPR: sprintf (name, "%cMMUPR", di); return name; case OR1K_SPG_DMMU_DTLBEIR: sprintf (name, "%cTLBEIR", di); return name; } /* ATB Match registers */ if((OR1K_SPG_DMMU_DATBMR <= index) && (index <= OR1K_SPG_DMMU_DATBMR_END)) { sprintf (name, "%cATBMR%d", di, index - OR1K_SPG_DMMU_DATBMR); return name; } /* ATB Translate registers */ if((OR1K_SPG_DMMU_DATBTR <= index) && (index <= OR1K_SPG_DMMU_DATBTR_END)) { sprintf (name, "%cATBTR%d", di, index - OR1K_SPG_DMMU_DATBTR); return name; } /* TLB Way 1 Match registers */ if((OR1K_SPG_DMMU_DTLBW1MR <= index) && (index <= OR1K_SPG_DMMU_DTLBW1MR_END)) { sprintf (name, "%cTLBW1MR%d", di, index - OR1K_SPG_DMMU_DTLBW1MR); return name; } /* TLB Way 1 Translate registers */ if((OR1K_SPG_DMMU_DTLBW1TR <= index) && (index <= OR1K_SPG_DMMU_DTLBW1TR_END)) { sprintf (name, "%cTLBW1TR%d", di, index - OR1K_SPG_DMMU_DTLBW1TR); return name; } /* TLB Way 2 Match registers */ if((OR1K_SPG_DMMU_DTLBW2MR <= index) && (index <= OR1K_SPG_DMMU_DTLBW2MR_END)) { sprintf (name, "%cTLBW2MR%d", di, index - OR1K_SPG_DMMU_DTLBW2MR); return name; } /* TLB Way 2 Translate registers */ if((OR1K_SPG_DMMU_DTLBW2TR <= index) && (index <= OR1K_SPG_DMMU_DTLBW2TR_END)) { sprintf (name, "%cTLBW2TR%d", di, index - OR1K_SPG_DMMU_DTLBW2TR); return name; } /* TLB Way 3 Match registers */ if((OR1K_SPG_DMMU_DTLBW3MR <= index) && (index <= OR1K_SPG_DMMU_DTLBW3MR_END)) { sprintf (name, "%cTLBW3MR%d", di, index - OR1K_SPG_DMMU_DTLBW3MR); return name; } /* TLB Way 3 Translate registers */ if((OR1K_SPG_DMMU_DTLBW3TR <= index) && (index <= OR1K_SPG_DMMU_DTLBW3TR_END)) { sprintf (name, "%cTLBW3TR%d", di, index - OR1K_SPG_DMMU_DTLBW3TR); return name; } break; case OR1K_SPG_DC: /* Data cache registers. These do not have an exact correspondence with their instruction cache counterparts, so must be done separately. */ /* 1:1 names */ switch (index) { case OR1K_SPG_DC_DCCR: sprintf (name, "DCCR" ); return name; case OR1K_SPG_DC_DCBPR: sprintf (name, "DCBPR"); return name; case OR1K_SPG_DC_DCBFR: sprintf (name, "DCBFR"); return name; case OR1K_SPG_DC_DCBIR: sprintf (name, "DCBIR"); return name; case OR1K_SPG_DC_DCBWR: sprintf (name, "DCBWR"); return name; case OR1K_SPG_DC_DCBLR: sprintf (name, "DCBLR"); return name; } break; case OR1K_SPG_IC: /* Instruction cache registers */ /* 1:1 names */ switch (index) { case OR1K_SPG_IC_ICCR: sprintf (name, "ICCR" ); return name; case OR1K_SPG_IC_ICBPR: sprintf (name, "ICBPR"); return name; case OR1K_SPG_IC_ICBIR: sprintf (name, "ICBIR"); return name; case OR1K_SPG_IC_ICBLR: sprintf (name, "ICBLR"); return name; } break; case OR1K_SPG_MAC: /* MAC registers */ /* 1:1 names */ switch (index) { case OR1K_SPG_MAC_MACLO: sprintf (name, "MACLO"); return name; case OR1K_SPG_MAC_MACHI: sprintf (name, "MACHI"); return name; } break; case OR1K_SPG_DEBUG: /* Debug registers */ /* Debug Value registers */ if((OR1K_SPG_DEBUG_DVR <= index) && (index <= OR1K_SPG_DEBUG_DVR_END)) { sprintf (name, "DVR%d", index - OR1K_SPG_DEBUG_DVR); return name; } /* Debug Control registers */ if((OR1K_SPG_DEBUG_DCR <= index) && (index <= OR1K_SPG_DEBUG_DCR_END)) { sprintf (name, "DCR%d", index - OR1K_SPG_DEBUG_DCR); return name; } /* 1:1 names */ switch (index) { case OR1K_SPG_DEBUG_DMR1: sprintf (name, "DMR1" ); return name; case OR1K_SPG_DEBUG_DMR2: sprintf (name, "DMR2" ); return name; case OR1K_SPG_DEBUG_DCWR0: sprintf (name, "DCWR0"); return name; case OR1K_SPG_DEBUG_DCWR1: sprintf (name, "DCWR1"); return name; case OR1K_SPG_DEBUG_DSR: sprintf (name, "DSR" ); return name; case OR1K_SPG_DEBUG_DRR: sprintf (name, "DRR" ); return name; } break; case OR1K_SPG_PC: /* Performance Counter registers */ /* Performance Counters Count registers */ if((OR1K_SPG_PC_PCCR <= index) && (index <= OR1K_SPG_PC_PCCR_END)) { sprintf (name, "PCCR%d", index - OR1K_SPG_PC_PCCR); return name; } /* Performance Counters Mode registers */ if((OR1K_SPG_PC_PCMR <= index) && (index <= OR1K_SPG_PC_PCMR_END)) { sprintf (name, "PCMR%d", index - OR1K_SPG_PC_PCMR); return name; } break; case OR1K_SPG_PM: /* Power Management registers */ /* 1:1 names */ switch (index) { case OR1K_SPG_PM_PMR: sprintf (name, "PMR"); return name; } break; case OR1K_SPG_PIC: /* Programmable Interrupt Controller registers */ /* 1:1 names */ switch (index) { case OR1K_SPG_PIC_PICMR: sprintf (name, "PICMR"); return name; case OR1K_SPG_PIC_PICSR: sprintf (name, "PICSR"); return name; } break; case OR1K_SPG_TT: /* Tick Timer registers */ /* 1:1 names */ switch (index) { case OR1K_SPG_TT_TTMR: sprintf (name, "TTMR"); return name; case OR1K_SPG_TT_TTCR: sprintf (name, "TTCR"); return name; } break; case OR1K_SPG_FPU: break; } /* Not a recognized register */ strcpy (name, ""); return name; } /* or1k_spr_register_name() */ /*----------------------------------------------------------------------------*/ /*!Get SPR group number from a name @param[in] group_name SPR register group @return The index, or negative if no match. */ /*----------------------------------------------------------------------------*/ static int or1k_groupnum_from_name (char *group_name) { int group; for (group = 0; group < OR1K_NUM_SPGS; group++) { if (0 == strcasecmp (group_name, or1k_spr_group_name (group))) { return group; } } return -1; } /* or1k_groupnum_from_name() */ /*----------------------------------------------------------------------------*/ /*!Get register index in special purpose register group from name The name may either be SPR<group_num>_<index> or a known unique name. In either case the group number must match the supplied group number. @param[in] group SPR register group @param[in] name Register name @return The index, or negative if no match. */ /*----------------------------------------------------------------------------*/ static int or1k_regnum_from_name (int group, char *name) { /* Last valid register in each group. */ static const int or1k_spr_group_last[OR1K_NUM_SPGS] = { OR1K_SPG_SYS_LAST, OR1K_SPG_DMMU_LAST, OR1K_SPG_IMMU_LAST, OR1K_SPG_DC_LAST, OR1K_SPG_IC_LAST, OR1K_SPG_MAC_LAST, OR1K_SPG_DEBUG_LAST, OR1K_SPG_PC_LAST, OR1K_SPG_PM_LAST, OR1K_SPG_PIC_LAST, OR1K_SPG_TT_LAST, OR1K_SPG_FPU_LAST }; int i; char spr_name[32]; if (0 == strcasecmp (name, "SPR")) { char *ptr_c; /* Skip SPR */ name += 3; /* Get group number */ i = (int) strtoul (name, &ptr_c, 10); if (*ptr_c != '_' || i != group) { return -1; } /* Get index */ ptr_c++; i = (int) strtoul (name, &ptr_c, 10); if (*ptr_c) { return -1; } else { return i; } } /* Look for a "known" name in this group */ for (i = 0; i <= or1k_spr_group_last[group]; i++) { char *s = or1k_spr_register_name (group, i, spr_name); if (0 == strcasecmp (name, s)) { return i; } } /* Failure */ return -1; } /* or1k_regnum_from_name() */ /*----------------------------------------------------------------------------*/ /*!Get the next token from a string I can't believe there isn't a library argument for this, but strtok is deprecated. Take a string and find the start of the next token and its length. A token is anything containing non-blank characters. @param[in] str The string to look at (may be NULL). @param[out] tok Pointer to the start of the token within str. May be NULL if this result is not wanted (e.g. just the length is wanted. If no token is found will be the NULL char at the end of the string, if the original str was NULL, this will be NULL. @return The length of the token found */ /*----------------------------------------------------------------------------*/ static int or1k_tokenize (char *str, char **tok) { char *ptr; int len; /* Deal with NULL argument */ if (NULL == str) { if (NULL != tok) { *tok = NULL; } return 0; } /* Find the start */ for (ptr = str; ISBLANK (*ptr) ; ptr++) { continue; } /* Return the start pointer if requested */ if (NULL != tok) { *tok = ptr; } /* Find the end and put in EOS */ for (len = 0; ('\0' != ptr[len]) && (!ISBLANK (ptr[len])); len++) { continue; } return len; } /* or1k_tokenize() */ /*----------------------------------------------------------------------------*/ /*!Parses args for spr commands Determines the special purpose register (SPR) name and puts result into group and index Syntax is: @verbatim <spr_args> -> <group_ref> | <reg_name> <group_ref> -> <group_id> <index> <group_id> -> <group_num> | <group_name> @endverbatim Where the indices/names have to be valid. So to parse, we look for 1 or 2 args. If 1 it must be a unique register name. If 2, the first must be a group number or name and the second an index within that group. Also responsible for providing diagnostics if the arguments do not match. Rewritten for GDB 6.8 to use the new UI calls and remove assorted bugs. Syntax also slightly restricted to be more comprehensible. @param[in] arg_str The argument string @param[out] group The group this SPR belongs in, or -1 to indicate failure @param[out] index Index of the register within the group, or -1 to indicate the whole group @param[in] is_set 1 (true) if we are called from the "spr" command (so there is an extra arg) rather than the "info spr" command. Needed to distinguish between the case where info is sought from a register specified as group and index and setting a uniquely identified register to a value. @return A pointer to any remaining args */ /*---------------------------------------------------------------------------*/ static char * or1k_parse_spr_params (char *arg_str, int *group, int *index, int is_set) { struct { char *str; int len; unsigned long int val; int is_num; } arg[3] = { { .str = NULL, .len = 0, .val = 0, .is_num = 0, }, { .str = NULL, .len = 0, .val = 0, .is_num = 0, }, { .str = NULL, .len = 0, .val = 0, .is_num = 0, } }; int num_args; char *trailer = arg_str; char *tmp_str; int i; char spr_name[32]; /* Break out the arguments. Note that the strings are NOT null terminated (we don't want to change arg_str), so we must rely on len. The stroul call will still work, since there is always a non-digit char (possibly EOS) after the last digit. */ if (NULL == arg_str) { num_args = 0; } else { for (num_args = 0; num_args < 3; num_args++) { arg[num_args].len = or1k_tokenize (trailer, &(arg[num_args].str)); trailer = arg[num_args].str + arg[num_args].len; if (0 == arg[num_args].len) { break; } } } /* Patch nulls into the arg strings and see about values. Couldn't do this earlier, since we needed the next char clean to check later args. This means advancing trailer, UNLESS it was already at EOS */ if((NULL != arg_str) && ('\0' != *trailer)) { trailer++; } for (i = 0; i < num_args; i++) { (arg[i].str)[arg[i].len] = '\0'; errno = 0; arg[i].val = strtoul (arg[i].str, &tmp_str, 0); arg[i].is_num = (0 == errno) && ('\0' == *tmp_str); } /* Deal with the case where we are setting a register, so the final argument should be disregarded (it is the trailer). Do this anyway if we get a third argument */ if ((is_set & (num_args > 0)) || (num_args > 2)) { trailer = arg[num_args - 1].str; num_args--; } /* Deal with different numbers of args */ switch (num_args) { case 0: ui_out_message (uiout, 0, "Usage: <command> <register> |\n" " <command> <group> |\n" " <command> <group> <index>\n" "Valid groups are:\n"); for (i = 0; i < OR1K_NUM_SPGS; i++) { ui_out_field_string (uiout, NULL, or1k_spr_group_name (i)); ui_out_spaces (uiout, 1); ui_out_wrap_hint (uiout, NULL); } ui_out_field_string (uiout, NULL, "\n"); *index = -1; return trailer; case 1: /* See if it is a numeric group */ if (arg[0].is_num) { if (arg[0].val < OR1K_NUM_SPGS) { *group = arg[0].val; *index = -1; return trailer; } else { ui_out_message (uiout, 0, "Group index should be in the range 0 - %d\n", OR1K_NUM_SPGS); *group = -1; *index = -1; return trailer; } } /* Is is it a group name? */ *group = or1k_groupnum_from_name (arg[0].str); if (*group >= 0) { *index = -1; return trailer; } /* See if it is a valid register name in any group */ for (*group = 0; *group < OR1K_NUM_SPGS; (*group)++) { *index = or1k_regnum_from_name (*group, arg[0].str); if (*index >= 0) { return trailer; } } /* Couldn't find it - print out a rude message */ ui_out_message (uiout, 0, "Group or register name not recognized.\n" "Valid groups are:\n"); for (i = 0; i < OR1K_NUM_SPGS; i++) { ui_out_field_string (uiout, NULL, or1k_spr_group_name (i)); ui_out_spaces (uiout, 1); ui_out_wrap_hint (uiout, NULL); } ui_out_field_string (uiout, NULL, "\n"); *group = -1; *index = -1; return trailer; case 2: /* See if first arg is a numeric group */ if (arg[0].is_num) { if (arg[0].val < OR1K_NUM_SPGS) { *group = arg[0].val; *index = -1; } else { ui_out_message (uiout, 0, "Group index should be in the range 0 - %d\n", OR1K_NUM_SPGS - 1); *group = -1; *index = -1; return trailer; } } else { /* Is is it a group name? */ *group = or1k_groupnum_from_name (arg[0].str); if (*group >= 0) { *index = -1; } else { ui_out_message (uiout, 0, "Group name not recognized.\n" "Valid groups are:\n"); for (i = 0; i < OR1K_NUM_SPGS; i++) { ui_out_field_string (uiout, NULL, or1k_spr_group_name (i)); ui_out_spaces (uiout, 1); ui_out_wrap_hint (uiout, NULL); } ui_out_field_string (uiout, NULL, "\n"); *group = -1; *index = -1; return trailer; } } /* Is second arg an index or name? */ if (arg[1].is_num) { if (arg[1].val < OR1K_SPG_SIZE) { /* Check this really is a register */ if (0 != strlen (or1k_spr_register_name (*group, arg[1].val, spr_name))) { *index = arg[1].val; return trailer; } else { ui_out_message (uiout, 0, "No valid register at that index in group\n"); *group = -1; *index = -1; return trailer; } } else { ui_out_message (uiout, 0, "Register index should be in the range 0 - %d\n", OR1K_SPG_SIZE - 1); *group = -1; *index = -1; return trailer; } } /* Must be a name */ *index = or1k_regnum_from_name (*group, arg[1].str); if (*index >= 0) { return trailer; } /* Couldn't find it - print out a rude message */ ui_out_message (uiout, 0, "Register name not recognized in group.\n"); *group = -1; *index = -1; return trailer; default: /* Anything else is an error */ ui_out_message (uiout, 0, "Unable to parse arguments\n"); *group = -1; *index = -1; return trailer; } } /* or1k_parse_spr_params() */ /*---------------------------------------------------------------------------*/ /*!Read a special purpose register from the target This has to be done using the target remote command "readspr" @param[in] regnum The register to read @return The value read */ /*---------------------------------------------------------------------------*/ static ULONGEST or1k_read_spr (unsigned int regnum) { struct ui_file *uibuf = mem_fileopen (); char cmd[sizeof ("readspr ffff")]; unsigned long int data; char *res; long int len; /* Create the command string and pass it to target remote command function */ sprintf (cmd, "readspr %4x", regnum); target_rcmd (cmd, uibuf); /* Get the output for the UI file as a string */ res = ui_file_xstrdup (uibuf, &len); sscanf (res, "%lx", &data); /* Tidy up */ xfree (res); ui_file_delete (uibuf); return (ULONGEST)data; } /* or1k_read_spr() */ /*---------------------------------------------------------------------------*/ /*!Write a special purpose register on the target This has to be done using the target remote command "writespr" Since the SPRs may map to GPR's or the other GDB register (PPC, NPC, SR), any register cache is flushed. @param[in] regnum The register to write @param[in] data The value to write */ /*---------------------------------------------------------------------------*/ static void or1k_write_spr (unsigned int regnum, ULONGEST data) { struct ui_file *uibuf = mem_fileopen (); char cmd[sizeof ("writespr ffff ffffffff")]; char *res; long int len; /* Create the command string and pass it to target remote command function */ sprintf (cmd, "writespr %4x %8llx", regnum, (long long unsigned int)data); target_rcmd (cmd, uibuf); /* Flush the register cache */ registers_changed (); /* We ignore the result - Rcmd can put out its own error messages. Just tidy up */ ui_file_delete (uibuf); } /* or1k_write_spr() */ /*----------------------------------------------------------------------------*/ /*!Show the value of a special purpose register or group This is a custom extension to the GDB info command. @param[in] args @param[in] from_tty True (1) if GDB is running from a TTY, false (0) otherwise. */ /*---------------------------------------------------------------------------*/ static void or1k_info_spr_command (char *args, int from_tty) { int group; int index; char spr_name[32]; or1k_parse_spr_params (args, &group, &index, 0); if (group < 0) { return; /* Couldn't parse the args */ } if (index >= 0) { ULONGEST value = or1k_read_spr (OR1K_SPR (group, index)); ui_out_field_fmt (uiout, NULL, "%s.%s = SPR%i_%i = %llu (0x%llx)\n", or1k_spr_group_name (group), or1k_spr_register_name (group, index, spr_name), group, index, (long long unsigned int)value, (long long unsigned int)value); } else { /* Print all valid registers in the group */ for (index = 0; index < OR1K_SPG_SIZE; index++) { if (0 != strlen (or1k_spr_register_name (group, index, spr_name))) { ULONGEST value = or1k_read_spr (OR1K_SPR (group, index)); ui_out_field_fmt (uiout, NULL, "%s.%s = SPR%i_%i = %llu (0x%llx)\n", or1k_spr_group_name (group), or1k_spr_register_name (group, index, spr_name), group, index, (long long unsigned int)value, (long long unsigned int)value); } } } } /* or1k_info_spr_command() */ /*----------------------------------------------------------------------------*/ /*!Set a special purpose register This is a custom command added to GDB. @param[in] args @param[in] from_tty True (1) if GDB is running from a TTY, false (0) otherwise. */ /*---------------------------------------------------------------------------*/ static void or1k_spr_command (char *args, int from_tty) { int group; int index; char *tmp_str; char *nargs = or1k_parse_spr_params (args, &group, &index, 1); ULONGEST old_val; ULONGEST new_val; char spr_name[32]; /* Do we have a valid register spec? */ if (index < 0) { return; /* Parser will have printed the error message */ } /* Do we have a value to set? */ errno = 0; new_val = (ULONGEST)strtoul (nargs, &tmp_str, 0); if((0 != errno) || ('\0' != *tmp_str)) { ui_out_message (uiout, 0, "Invalid value - register not changed\n"); return; } old_val = or1k_read_spr (OR1K_SPR (group, index)); or1k_write_spr (OR1K_SPR (group, index) , new_val); ui_out_field_fmt (uiout, NULL, "%s.%s (SPR%i_%i) set to %llu (0x%llx), " "was: %llu (0x%llx)\n", or1k_spr_group_name (group), or1k_spr_register_name (group, index, spr_name) , group, index, (long long unsigned int)new_val, (long long unsigned int)new_val, (long long unsigned int)old_val, (long long unsigned int)old_val); } /* or1k_spr_command() */ /*----------------------------------------------------------------------------*/ /*!Main entry point for target architecture initialization In this version initializes the architecture via registers_gdbarch_init(). Add a command to set and show special purpose registers. */ /*---------------------------------------------------------------------------*/ void _initialize_or1k_tdep (void) { /* Register this architecture. We should do this for or16 and or64 when they have their BFD defined. */ gdbarch_register (bfd_arch_or32, or1k_gdbarch_init, or1k_dump_tdep); /* Initialize the automata for the assembler */ build_automata(); /* Commands to show and set special purpose registers */ add_info ("spr", or1k_info_spr_command, "Show the value of a special purpose register"); add_com ("spr", class_support, or1k_spr_command, "Set a special purpose register"); } /* _initialize_or1k_tdep() */
Go to most recent revision | Compare with Previous | Blame | View Log