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markom |
/* OBSOLETE /* Target-dependent code for the TI TMS320C80 (MVP) for GDB, the GNU debugger. */
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/* OBSOLETE Copyright 1996, 1997, 1999, 2000, 2001 Free Software Foundation, Inc. */
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/* OBSOLETE */
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/* OBSOLETE This file is part of GDB. */
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/* OBSOLETE */
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/* OBSOLETE This program is free software; you can redistribute it and/or modify */
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/* OBSOLETE it under the terms of the GNU General Public License as published by */
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/* OBSOLETE the Free Software Foundation; either version 2 of the License, or */
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/* OBSOLETE (at your option) any later version. */
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/* OBSOLETE */
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/* OBSOLETE This program is distributed in the hope that it will be useful, */
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/* OBSOLETE but WITHOUT ANY WARRANTY; without even the implied warranty of */
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/* OBSOLETE MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */
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/* OBSOLETE GNU General Public License for more details. */
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/* OBSOLETE */
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/* OBSOLETE You should have received a copy of the GNU General Public License */
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/* OBSOLETE along with this program; if not, write to the Free Software */
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/* OBSOLETE Foundation, Inc., 59 Temple Place - Suite 330, */
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/* OBSOLETE Boston, MA 02111-1307, USA. */ */
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/* OBSOLETE */
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/* OBSOLETE #include "defs.h" */
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/* OBSOLETE #include "value.h" */
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/* OBSOLETE #include "frame.h" */
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/* OBSOLETE #include "inferior.h" */
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/* OBSOLETE #include "obstack.h" */
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/* OBSOLETE #include "target.h" */
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/* OBSOLETE #include "bfd.h" */
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/* OBSOLETE #include "gdb_string.h" */
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/* OBSOLETE #include "gdbcore.h" */
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/* OBSOLETE #include "symfile.h" */
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/* OBSOLETE #include "regcache.h" */
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/* OBSOLETE */
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/* OBSOLETE /* Function: frame_find_saved_regs */
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/* OBSOLETE Return the frame_saved_regs structure for the frame. */
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/* OBSOLETE Doesn't really work for dummy frames, but it does pass back */
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/* OBSOLETE an empty frame_saved_regs, so I guess that's better than total failure */ */
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/* OBSOLETE */
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/* OBSOLETE void */
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/* OBSOLETE tic80_frame_find_saved_regs (struct frame_info *fi, */
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/* OBSOLETE struct frame_saved_regs *regaddr) */
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/* OBSOLETE { */
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/* OBSOLETE memcpy (regaddr, &fi->fsr, sizeof (struct frame_saved_regs)); */
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/* OBSOLETE } */
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/* OBSOLETE */
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/* OBSOLETE /* Function: skip_prologue */
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/* OBSOLETE Find end of function prologue. */ */
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/* OBSOLETE */
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/* OBSOLETE CORE_ADDR */
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/* OBSOLETE tic80_skip_prologue (CORE_ADDR pc) */
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/* OBSOLETE { */
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/* OBSOLETE CORE_ADDR func_addr, func_end; */
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/* OBSOLETE struct symtab_and_line sal; */
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/* OBSOLETE */
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/* OBSOLETE /* See what the symbol table says */ */
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/* OBSOLETE */
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/* OBSOLETE if (find_pc_partial_function (pc, NULL, &func_addr, &func_end)) */
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/* OBSOLETE { */
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/* OBSOLETE sal = find_pc_line (func_addr, 0); */
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/* OBSOLETE */
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/* OBSOLETE if (sal.line != 0 && sal.end < func_end) */
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/* OBSOLETE return sal.end; */
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/* OBSOLETE else */
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/* OBSOLETE /* Either there's no line info, or the line after the prologue is after */
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/* OBSOLETE the end of the function. In this case, there probably isn't a */
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/* OBSOLETE prologue. */ */
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/* OBSOLETE return pc; */
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/* OBSOLETE } */
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/* OBSOLETE */
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/* OBSOLETE /* We can't find the start of this function, so there's nothing we can do. */ */
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/* OBSOLETE return pc; */
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/* OBSOLETE } */
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/* OBSOLETE */
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/* OBSOLETE /* Function: tic80_scan_prologue */
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/* OBSOLETE This function decodes the target function prologue to determine: */
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/* OBSOLETE 1) the size of the stack frame */
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/* OBSOLETE 2) which registers are saved on it */
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/* OBSOLETE 3) the offsets of saved regs */
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/* OBSOLETE 4) the frame size */
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/* OBSOLETE This information is stored in the "extra" fields of the frame_info. */ */
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/* OBSOLETE */
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/* OBSOLETE static void */
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/* OBSOLETE tic80_scan_prologue (struct frame_info *fi) */
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/* OBSOLETE { */
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/* OBSOLETE struct symtab_and_line sal; */
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/* OBSOLETE CORE_ADDR prologue_start, prologue_end, current_pc; */
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/* OBSOLETE */
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/* OBSOLETE /* Assume there is no frame until proven otherwise. */ */
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/* OBSOLETE fi->framereg = SP_REGNUM; */
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/* OBSOLETE fi->framesize = 0; */
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/* OBSOLETE fi->frameoffset = 0; */
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/* OBSOLETE */
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/* OBSOLETE /* this code essentially duplicates skip_prologue, */
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/* OBSOLETE but we need the start address below. */ */
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/* OBSOLETE */
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/* OBSOLETE if (find_pc_partial_function (fi->pc, NULL, &prologue_start, &prologue_end)) */
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/* OBSOLETE { */
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/* OBSOLETE sal = find_pc_line (prologue_start, 0); */
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/* OBSOLETE */
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/* OBSOLETE if (sal.line == 0) /* no line info, use current PC */ */
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/* OBSOLETE if (prologue_start != entry_point_address ()) */
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/* OBSOLETE prologue_end = fi->pc; */
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/* OBSOLETE else */
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/* OBSOLETE return; /* _start has no frame or prologue */ */
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/* OBSOLETE else if (sal.end < prologue_end) /* next line begins after fn end */ */
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/* OBSOLETE prologue_end = sal.end; /* (probably means no prologue) */ */
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/* OBSOLETE } */
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/* OBSOLETE else */
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/* OBSOLETE /* FIXME */ */
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/* OBSOLETE prologue_end = prologue_start + 40; /* We're in the boondocks: allow for */ */
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/* OBSOLETE /* 16 pushes, an add, and "mv fp,sp" */ */
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/* OBSOLETE */
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/* OBSOLETE prologue_end = min (prologue_end, fi->pc); */
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/* OBSOLETE */
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/* OBSOLETE /* Now search the prologue looking for instructions that set up the */
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/* OBSOLETE frame pointer, adjust the stack pointer, and save registers. */ */
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/* OBSOLETE */
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/* OBSOLETE for (current_pc = prologue_start; current_pc < prologue_end; current_pc += 4) */
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/* OBSOLETE { */
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/* OBSOLETE unsigned int insn; */
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/* OBSOLETE int regno; */
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/* OBSOLETE int offset = 0; */
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/* OBSOLETE */
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/* OBSOLETE insn = read_memory_unsigned_integer (current_pc, 4); */
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/* OBSOLETE */
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/* OBSOLETE if ((insn & 0x301000) == 0x301000) /* Long immediate? */ */
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/* OBSOLETE /* FIXME - set offset for long immediate instructions */ */
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/* OBSOLETE current_pc += 4; */
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/* OBSOLETE else */
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/* OBSOLETE { */
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/* OBSOLETE offset = insn & 0x7fff; /* extract 15-bit offset */ */
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/* OBSOLETE if (offset & 0x4000) /* if negative, sign-extend */ */
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/* OBSOLETE offset = -(0x8000 - offset); */
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/* OBSOLETE } */
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/* OBSOLETE */
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/* OBSOLETE if ((insn & 0x7fd0000) == 0x590000) /* st.{w,d} reg, xx(r1) */ */
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/* OBSOLETE { */
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/* OBSOLETE regno = ((insn >> 27) & 0x1f); */
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/* OBSOLETE fi->fsr.regs[regno] = offset; */
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/* OBSOLETE if (insn & 0x8000) /* 64-bit store (st.d)? */ */
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/* OBSOLETE fi->fsr.regs[regno + 1] = offset + 4; */
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/* OBSOLETE } */
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/* OBSOLETE else if ((insn & 0xffff8000) == 0x086c8000) /* addu xx, r1, r1 */ */
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/* OBSOLETE fi->framesize = -offset; */
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/* OBSOLETE else if ((insn & 0xffff8000) == 0xf06c8000) /* addu xx, r1, r30 */ */
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/* OBSOLETE { */
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/* OBSOLETE fi->framereg = FP_REGNUM; /* fp is now valid */ */
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/* OBSOLETE fi->frameoffset = offset; */
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/* OBSOLETE break; /* end of stack adjustments */ */
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/* OBSOLETE } */
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/* OBSOLETE else if (insn == 0xf03b2001) /* addu r1, r0, r30 */ */
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/* OBSOLETE { */
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/* OBSOLETE fi->framereg = FP_REGNUM; /* fp is now valid */ */
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/* OBSOLETE fi->frameoffset = 0; */
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/* OBSOLETE break; /* end of stack adjustments */ */
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/* OBSOLETE } */
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/* OBSOLETE else */
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/* OBSOLETE /* FIXME - handle long immediate instructions */ */
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/* OBSOLETE break; /* anything else isn't prologue */ */
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/* OBSOLETE } */
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/* OBSOLETE } */
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/* OBSOLETE */
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/* OBSOLETE /* Function: init_extra_frame_info */
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/* OBSOLETE This function actually figures out the frame address for a given pc and */
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/* OBSOLETE sp. This is tricky on the c80 because we sometimes don't use an explicit */
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/* OBSOLETE frame pointer, and the previous stack pointer isn't necessarily recorded */
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/* OBSOLETE on the stack. The only reliable way to get this info is to */
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/* OBSOLETE examine the prologue. */ */
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/* OBSOLETE */
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/* OBSOLETE void */
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/* OBSOLETE tic80_init_extra_frame_info (struct frame_info *fi) */
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/* OBSOLETE { */
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/* OBSOLETE int reg; */
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/* OBSOLETE */
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/* OBSOLETE if (fi->next) */
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/* OBSOLETE fi->pc = FRAME_SAVED_PC (fi->next); */
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/* OBSOLETE */
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/* OBSOLETE /* Because zero is a valid register offset relative to SP, we initialize */
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/* OBSOLETE the offsets to -1 to indicate unused entries. */ */
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/* OBSOLETE for (reg = 0; reg < NUM_REGS; reg++) */
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/* OBSOLETE fi->fsr.regs[reg] = -1; */
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/* OBSOLETE */
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/* OBSOLETE if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) */
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/* OBSOLETE { */
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/* OBSOLETE /* We need to setup fi->frame here because run_stack_dummy gets it wrong */
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/* OBSOLETE by assuming it's always FP. */ */
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/* OBSOLETE fi->frame = generic_read_register_dummy (fi->pc, fi->frame, SP_REGNUM); */
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/* OBSOLETE fi->framesize = 0; */
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/* OBSOLETE fi->frameoffset = 0; */
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/* OBSOLETE return; */
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/* OBSOLETE } */
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| 191 |
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/* OBSOLETE else */
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/* OBSOLETE { */
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/* OBSOLETE tic80_scan_prologue (fi); */
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/* OBSOLETE */
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/* OBSOLETE if (!fi->next) /* this is the innermost frame? */ */
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/* OBSOLETE fi->frame = read_register (fi->framereg); */
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/* OBSOLETE else */
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/* OBSOLETE /* not the innermost frame */ */
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| 199 |
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/* OBSOLETE /* If this function uses FP as the frame register, and the function */
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| 200 |
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/* OBSOLETE it called saved the FP, get the saved FP. */ if (fi->framereg == FP_REGNUM && */
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/* OBSOLETE fi->next->fsr.regs[FP_REGNUM] != (unsigned) -1) */
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| 202 |
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/* OBSOLETE fi->frame = read_memory_integer (fi->next->fsr.regs[FP_REGNUM], 4); */
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| 203 |
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/* OBSOLETE */
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| 204 |
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/* OBSOLETE /* Convert SP-relative offsets of saved registers to real addresses. */ */
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| 205 |
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/* OBSOLETE for (reg = 0; reg < NUM_REGS; reg++) */
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| 206 |
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/* OBSOLETE if (fi->fsr.regs[reg] == (unsigned) -1) */
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/* OBSOLETE fi->fsr.regs[reg] = 0; /* unused entry */ */
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| 208 |
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/* OBSOLETE else */
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| 209 |
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/* OBSOLETE fi->fsr.regs[reg] += fi->frame - fi->frameoffset; */
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| 210 |
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/* OBSOLETE } */
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| 211 |
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/* OBSOLETE } */
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| 212 |
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/* OBSOLETE */
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| 213 |
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/* OBSOLETE /* Function: find_callers_reg */
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| 214 |
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/* OBSOLETE Find REGNUM on the stack. Otherwise, it's in an active register. One thing */
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| 215 |
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/* OBSOLETE we might want to do here is to check REGNUM against the clobber mask, and */
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| 216 |
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/* OBSOLETE somehow flag it as invalid if it isn't saved on the stack somewhere. This */
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/* OBSOLETE would provide a graceful failure mode when trying to get the value of */
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| 218 |
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/* OBSOLETE caller-saves registers for an inner frame. */ */
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| 219 |
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/* OBSOLETE */
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| 220 |
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/* OBSOLETE CORE_ADDR */
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| 221 |
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/* OBSOLETE tic80_find_callers_reg (struct frame_info *fi, int regnum) */
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| 222 |
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/* OBSOLETE { */
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| 223 |
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/* OBSOLETE for (; fi; fi = fi->next) */
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| 224 |
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/* OBSOLETE if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) */
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| 225 |
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/* OBSOLETE return generic_read_register_dummy (fi->pc, fi->frame, regnum); */
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| 226 |
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/* OBSOLETE else if (fi->fsr.regs[regnum] != 0) */
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| 227 |
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/* OBSOLETE return read_memory_integer (fi->fsr.regs[regnum], */
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| 228 |
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/* OBSOLETE REGISTER_RAW_SIZE (regnum)); */
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| 229 |
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/* OBSOLETE return read_register (regnum); */
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| 230 |
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/* OBSOLETE } */
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| 231 |
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/* OBSOLETE */
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| 232 |
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/* OBSOLETE /* Function: frame_chain */
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| 233 |
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/* OBSOLETE Given a GDB frame, determine the address of the calling function's frame. */
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| 234 |
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/* OBSOLETE This will be used to create a new GDB frame struct, and then */
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| 235 |
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/* OBSOLETE INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC will be called for the new frame. */
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| 236 |
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/* OBSOLETE For c80, we save the frame size when we initialize the frame_info. */ */
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| 237 |
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/* OBSOLETE */
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| 238 |
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/* OBSOLETE CORE_ADDR */
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| 239 |
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/* OBSOLETE tic80_frame_chain (struct frame_info *fi) */
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| 240 |
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/* OBSOLETE { */
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| 241 |
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/* OBSOLETE CORE_ADDR fn_start, callers_pc, fp; */
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| 242 |
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/* OBSOLETE */
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| 243 |
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/* OBSOLETE /* is this a dummy frame? */ */
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| 244 |
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/* OBSOLETE if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) */
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| 245 |
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/* OBSOLETE return fi->frame; /* dummy frame same as caller's frame */ */
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| 246 |
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/* OBSOLETE */
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| 247 |
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/* OBSOLETE /* is caller-of-this a dummy frame? */ */
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| 248 |
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/* OBSOLETE callers_pc = FRAME_SAVED_PC (fi); /* find out who called us: */ */
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| 249 |
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/* OBSOLETE fp = tic80_find_callers_reg (fi, FP_REGNUM); */
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| 250 |
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/* OBSOLETE if (PC_IN_CALL_DUMMY (callers_pc, fp, fp)) */
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| 251 |
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/* OBSOLETE return fp; /* dummy frame's frame may bear no relation to ours */ */
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| 252 |
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/* OBSOLETE */
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| 253 |
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/* OBSOLETE if (find_pc_partial_function (fi->pc, 0, &fn_start, 0)) */
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| 254 |
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/* OBSOLETE if (fn_start == entry_point_address ()) */
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| 255 |
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/* OBSOLETE return 0; /* in _start fn, don't chain further */ */
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| 256 |
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/* OBSOLETE */
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| 257 |
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/* OBSOLETE if (fi->framereg == FP_REGNUM) */
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| 258 |
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/* OBSOLETE return tic80_find_callers_reg (fi, FP_REGNUM); */
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| 259 |
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/* OBSOLETE else */
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| 260 |
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/* OBSOLETE return fi->frame + fi->framesize; */
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| 261 |
|
|
/* OBSOLETE } */
|
| 262 |
|
|
/* OBSOLETE */
|
| 263 |
|
|
/* OBSOLETE /* Function: pop_frame */
|
| 264 |
|
|
/* OBSOLETE Discard from the stack the innermost frame, */
|
| 265 |
|
|
/* OBSOLETE restoring all saved registers. */ */
|
| 266 |
|
|
/* OBSOLETE */
|
| 267 |
|
|
/* OBSOLETE struct frame_info * */
|
| 268 |
|
|
/* OBSOLETE tic80_pop_frame (struct frame_info *frame) */
|
| 269 |
|
|
/* OBSOLETE { */
|
| 270 |
|
|
/* OBSOLETE int regnum; */
|
| 271 |
|
|
/* OBSOLETE */
|
| 272 |
|
|
/* OBSOLETE if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame)) */
|
| 273 |
|
|
/* OBSOLETE generic_pop_dummy_frame (); */
|
| 274 |
|
|
/* OBSOLETE else */
|
| 275 |
|
|
/* OBSOLETE { */
|
| 276 |
|
|
/* OBSOLETE for (regnum = 0; regnum < NUM_REGS; regnum++) */
|
| 277 |
|
|
/* OBSOLETE if (frame->fsr.regs[regnum] != 0) */
|
| 278 |
|
|
/* OBSOLETE write_register (regnum, */
|
| 279 |
|
|
/* OBSOLETE read_memory_integer (frame->fsr.regs[regnum], 4)); */
|
| 280 |
|
|
/* OBSOLETE */
|
| 281 |
|
|
/* OBSOLETE write_register (PC_REGNUM, FRAME_SAVED_PC (frame)); */
|
| 282 |
|
|
/* OBSOLETE write_register (SP_REGNUM, read_register (FP_REGNUM)); */
|
| 283 |
|
|
/* OBSOLETE #if 0 */
|
| 284 |
|
|
/* OBSOLETE if (read_register (PSW_REGNUM) & 0x80) */
|
| 285 |
|
|
/* OBSOLETE write_register (SPU_REGNUM, read_register (SP_REGNUM)); */
|
| 286 |
|
|
/* OBSOLETE else */
|
| 287 |
|
|
/* OBSOLETE write_register (SPI_REGNUM, read_register (SP_REGNUM)); */
|
| 288 |
|
|
/* OBSOLETE #endif */
|
| 289 |
|
|
/* OBSOLETE } */
|
| 290 |
|
|
/* OBSOLETE flush_cached_frames (); */
|
| 291 |
|
|
/* OBSOLETE return NULL; */
|
| 292 |
|
|
/* OBSOLETE } */
|
| 293 |
|
|
/* OBSOLETE */
|
| 294 |
|
|
/* OBSOLETE /* Function: frame_saved_pc */
|
| 295 |
|
|
/* OBSOLETE Find the caller of this frame. We do this by seeing if LR_REGNUM is saved */
|
| 296 |
|
|
/* OBSOLETE in the stack anywhere, otherwise we get it from the registers. */ */
|
| 297 |
|
|
/* OBSOLETE */
|
| 298 |
|
|
/* OBSOLETE CORE_ADDR */
|
| 299 |
|
|
/* OBSOLETE tic80_frame_saved_pc (struct frame_info *fi) */
|
| 300 |
|
|
/* OBSOLETE { */
|
| 301 |
|
|
/* OBSOLETE if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) */
|
| 302 |
|
|
/* OBSOLETE return generic_read_register_dummy (fi->pc, fi->frame, PC_REGNUM); */
|
| 303 |
|
|
/* OBSOLETE else */
|
| 304 |
|
|
/* OBSOLETE return tic80_find_callers_reg (fi, LR_REGNUM); */
|
| 305 |
|
|
/* OBSOLETE } */
|
| 306 |
|
|
/* OBSOLETE */
|
| 307 |
|
|
/* OBSOLETE /* Function: tic80_push_return_address (pc, sp) */
|
| 308 |
|
|
/* OBSOLETE Set up the return address for the inferior function call. */
|
| 309 |
|
|
/* OBSOLETE Necessary for targets that don't actually execute a JSR/BSR instruction */
|
| 310 |
|
|
/* OBSOLETE (ie. when using an empty CALL_DUMMY) */ */
|
| 311 |
|
|
/* OBSOLETE */
|
| 312 |
|
|
/* OBSOLETE CORE_ADDR */
|
| 313 |
|
|
/* OBSOLETE tic80_push_return_address (CORE_ADDR pc, CORE_ADDR sp) */
|
| 314 |
|
|
/* OBSOLETE { */
|
| 315 |
|
|
/* OBSOLETE write_register (LR_REGNUM, CALL_DUMMY_ADDRESS ()); */
|
| 316 |
|
|
/* OBSOLETE return sp; */
|
| 317 |
|
|
/* OBSOLETE } */
|
| 318 |
|
|
/* OBSOLETE */
|
| 319 |
|
|
/* OBSOLETE */
|
| 320 |
|
|
/* OBSOLETE /* Function: push_arguments */
|
| 321 |
|
|
/* OBSOLETE Setup the function arguments for calling a function in the inferior. */
|
| 322 |
|
|
/* OBSOLETE */
|
| 323 |
|
|
/* OBSOLETE On the TI C80 architecture, there are six register pairs (R2/R3 to R12/13) */
|
| 324 |
|
|
/* OBSOLETE which are dedicated for passing function arguments. Up to the first six */
|
| 325 |
|
|
/* OBSOLETE arguments (depending on size) may go into these registers. */
|
| 326 |
|
|
/* OBSOLETE The rest go on the stack. */
|
| 327 |
|
|
/* OBSOLETE */
|
| 328 |
|
|
/* OBSOLETE Arguments that are smaller than 4 bytes will still take up a whole */
|
| 329 |
|
|
/* OBSOLETE register or a whole 32-bit word on the stack, and will be */
|
| 330 |
|
|
/* OBSOLETE right-justified in the register or the stack word. This includes */
|
| 331 |
|
|
/* OBSOLETE chars, shorts, and small aggregate types. */
|
| 332 |
|
|
/* OBSOLETE */
|
| 333 |
|
|
/* OBSOLETE Arguments that are four bytes or less in size are placed in the */
|
| 334 |
|
|
/* OBSOLETE even-numbered register of a register pair, and the odd-numbered */
|
| 335 |
|
|
/* OBSOLETE register is not used. */
|
| 336 |
|
|
/* OBSOLETE */
|
| 337 |
|
|
/* OBSOLETE Arguments of 8 bytes size (such as floating point doubles) are placed */
|
| 338 |
|
|
/* OBSOLETE in a register pair. The least significant 32-bit word is placed in */
|
| 339 |
|
|
/* OBSOLETE the even-numbered register, and the most significant word in the */
|
| 340 |
|
|
/* OBSOLETE odd-numbered register. */
|
| 341 |
|
|
/* OBSOLETE */
|
| 342 |
|
|
/* OBSOLETE Aggregate types with sizes between 4 and 8 bytes are passed */
|
| 343 |
|
|
/* OBSOLETE entirely on the stack, and are left-justified within the */
|
| 344 |
|
|
/* OBSOLETE double-word (as opposed to aggregates smaller than 4 bytes */
|
| 345 |
|
|
/* OBSOLETE which are right-justified). */
|
| 346 |
|
|
/* OBSOLETE */
|
| 347 |
|
|
/* OBSOLETE Aggregates of greater than 8 bytes are first copied onto the stack, */
|
| 348 |
|
|
/* OBSOLETE and then a pointer to the copy is passed in the place of the normal */
|
| 349 |
|
|
/* OBSOLETE argument (either in a register if available, or on the stack). */
|
| 350 |
|
|
/* OBSOLETE */
|
| 351 |
|
|
/* OBSOLETE Functions that must return an aggregate type can return it in the */
|
| 352 |
|
|
/* OBSOLETE normal return value registers (R2 and R3) if its size is 8 bytes or */
|
| 353 |
|
|
/* OBSOLETE less. For larger return values, the caller must allocate space for */
|
| 354 |
|
|
/* OBSOLETE the callee to copy the return value to. A pointer to this space is */
|
| 355 |
|
|
/* OBSOLETE passed as an implicit first argument, always in R0. */ */
|
| 356 |
|
|
/* OBSOLETE */
|
| 357 |
|
|
/* OBSOLETE CORE_ADDR */
|
| 358 |
|
|
/* OBSOLETE tic80_push_arguments (int nargs, value_ptr *args, CORE_ADDR sp, */
|
| 359 |
|
|
/* OBSOLETE unsigned char struct_return, CORE_ADDR struct_addr) */
|
| 360 |
|
|
/* OBSOLETE { */
|
| 361 |
|
|
/* OBSOLETE int stack_offset, stack_alloc; */
|
| 362 |
|
|
/* OBSOLETE int argreg; */
|
| 363 |
|
|
/* OBSOLETE int argnum; */
|
| 364 |
|
|
/* OBSOLETE struct type *type; */
|
| 365 |
|
|
/* OBSOLETE CORE_ADDR regval; */
|
| 366 |
|
|
/* OBSOLETE char *val; */
|
| 367 |
|
|
/* OBSOLETE char valbuf[4]; */
|
| 368 |
|
|
/* OBSOLETE int len; */
|
| 369 |
|
|
/* OBSOLETE int odd_sized_struct; */
|
| 370 |
|
|
/* OBSOLETE int is_struct; */
|
| 371 |
|
|
/* OBSOLETE */
|
| 372 |
|
|
/* OBSOLETE /* first force sp to a 4-byte alignment */ */
|
| 373 |
|
|
/* OBSOLETE sp = sp & ~3; */
|
| 374 |
|
|
/* OBSOLETE */
|
| 375 |
|
|
/* OBSOLETE argreg = ARG0_REGNUM; */
|
| 376 |
|
|
/* OBSOLETE /* The "struct return pointer" pseudo-argument goes in R0 */ */
|
| 377 |
|
|
/* OBSOLETE if (struct_return) */
|
| 378 |
|
|
/* OBSOLETE write_register (argreg++, struct_addr); */
|
| 379 |
|
|
/* OBSOLETE */
|
| 380 |
|
|
/* OBSOLETE /* Now make sure there's space on the stack */ */
|
| 381 |
|
|
/* OBSOLETE for (argnum = 0, stack_alloc = 0; */
|
| 382 |
|
|
/* OBSOLETE argnum < nargs; argnum++) */
|
| 383 |
|
|
/* OBSOLETE stack_alloc += ((TYPE_LENGTH (VALUE_TYPE (args[argnum])) + 3) & ~3); */
|
| 384 |
|
|
/* OBSOLETE sp -= stack_alloc; /* make room on stack for args */ */
|
| 385 |
|
|
/* OBSOLETE */
|
| 386 |
|
|
/* OBSOLETE */
|
| 387 |
|
|
/* OBSOLETE /* Now load as many as possible of the first arguments into */
|
| 388 |
|
|
/* OBSOLETE registers, and push the rest onto the stack. There are 16 bytes */
|
| 389 |
|
|
/* OBSOLETE in four registers available. Loop thru args from first to last. */ */
|
| 390 |
|
|
/* OBSOLETE */
|
| 391 |
|
|
/* OBSOLETE argreg = ARG0_REGNUM; */
|
| 392 |
|
|
/* OBSOLETE for (argnum = 0, stack_offset = 0; argnum < nargs; argnum++) */
|
| 393 |
|
|
/* OBSOLETE { */
|
| 394 |
|
|
/* OBSOLETE type = VALUE_TYPE (args[argnum]); */
|
| 395 |
|
|
/* OBSOLETE len = TYPE_LENGTH (type); */
|
| 396 |
|
|
/* OBSOLETE memset (valbuf, 0, sizeof (valbuf)); */
|
| 397 |
|
|
/* OBSOLETE val = (char *) VALUE_CONTENTS (args[argnum]); */
|
| 398 |
|
|
/* OBSOLETE */
|
| 399 |
|
|
/* OBSOLETE /* FIXME -- tic80 can take doubleword arguments in register pairs */ */
|
| 400 |
|
|
/* OBSOLETE is_struct = (type->code == TYPE_CODE_STRUCT); */
|
| 401 |
|
|
/* OBSOLETE odd_sized_struct = 0; */
|
| 402 |
|
|
/* OBSOLETE */
|
| 403 |
|
|
/* OBSOLETE if (!is_struct) */
|
| 404 |
|
|
/* OBSOLETE { */
|
| 405 |
|
|
/* OBSOLETE if (len < 4) */
|
| 406 |
|
|
/* OBSOLETE { /* value gets right-justified in the register or stack word */ */
|
| 407 |
|
|
/* OBSOLETE memcpy (valbuf + (4 - len), val, len); */
|
| 408 |
|
|
/* OBSOLETE val = valbuf; */
|
| 409 |
|
|
/* OBSOLETE } */
|
| 410 |
|
|
/* OBSOLETE if (len > 4 && (len & 3) != 0) */
|
| 411 |
|
|
/* OBSOLETE odd_sized_struct = 1; /* such structs go entirely on stack */ */
|
| 412 |
|
|
/* OBSOLETE } */
|
| 413 |
|
|
/* OBSOLETE else */
|
| 414 |
|
|
/* OBSOLETE { */
|
| 415 |
|
|
/* OBSOLETE /* Structs are always passed by reference. */ */
|
| 416 |
|
|
/* OBSOLETE write_register (argreg, sp + stack_offset); */
|
| 417 |
|
|
/* OBSOLETE argreg++; */
|
| 418 |
|
|
/* OBSOLETE } */
|
| 419 |
|
|
/* OBSOLETE */
|
| 420 |
|
|
/* OBSOLETE while (len > 0) */
|
| 421 |
|
|
/* OBSOLETE { */
|
| 422 |
|
|
/* OBSOLETE if (is_struct || argreg > ARGLAST_REGNUM || odd_sized_struct) */
|
| 423 |
|
|
/* OBSOLETE { /* must go on the stack */ */
|
| 424 |
|
|
/* OBSOLETE write_memory (sp + stack_offset, val, 4); */
|
| 425 |
|
|
/* OBSOLETE stack_offset += 4; */
|
| 426 |
|
|
/* OBSOLETE } */
|
| 427 |
|
|
/* OBSOLETE /* NOTE WELL!!!!! This is not an "else if" clause!!! */
|
| 428 |
|
|
/* OBSOLETE That's because some things get passed on the stack */
|
| 429 |
|
|
/* OBSOLETE AND in the registers! */ */
|
| 430 |
|
|
/* OBSOLETE if (!is_struct && argreg <= ARGLAST_REGNUM) */
|
| 431 |
|
|
/* OBSOLETE { /* there's room in a register */ */
|
| 432 |
|
|
/* OBSOLETE regval = extract_address (val, REGISTER_RAW_SIZE (argreg)); */
|
| 433 |
|
|
/* OBSOLETE write_register (argreg, regval); */
|
| 434 |
|
|
/* OBSOLETE argreg += 2; /* FIXME -- what about doubleword args? */ */
|
| 435 |
|
|
/* OBSOLETE } */
|
| 436 |
|
|
/* OBSOLETE /* Store the value 4 bytes at a time. This means that things */
|
| 437 |
|
|
/* OBSOLETE larger than 4 bytes may go partly in registers and partly */
|
| 438 |
|
|
/* OBSOLETE on the stack. */ */
|
| 439 |
|
|
/* OBSOLETE len -= REGISTER_RAW_SIZE (argreg); */
|
| 440 |
|
|
/* OBSOLETE val += REGISTER_RAW_SIZE (argreg); */
|
| 441 |
|
|
/* OBSOLETE } */
|
| 442 |
|
|
/* OBSOLETE } */
|
| 443 |
|
|
/* OBSOLETE return sp; */
|
| 444 |
|
|
/* OBSOLETE } */
|
| 445 |
|
|
/* OBSOLETE */
|
| 446 |
|
|
/* OBSOLETE /* Function: tic80_write_sp */
|
| 447 |
|
|
/* OBSOLETE Because SP is really a read-only register that mirrors either SPU or SPI, */
|
| 448 |
|
|
/* OBSOLETE we must actually write one of those two as well, depending on PSW. */ */
|
| 449 |
|
|
/* OBSOLETE */
|
| 450 |
|
|
/* OBSOLETE void */
|
| 451 |
|
|
/* OBSOLETE tic80_write_sp (CORE_ADDR val) */
|
| 452 |
|
|
/* OBSOLETE { */
|
| 453 |
|
|
/* OBSOLETE #if 0 */
|
| 454 |
|
|
/* OBSOLETE unsigned long psw = read_register (PSW_REGNUM); */
|
| 455 |
|
|
/* OBSOLETE */
|
| 456 |
|
|
/* OBSOLETE if (psw & 0x80) /* stack mode: user or interrupt */ */
|
| 457 |
|
|
/* OBSOLETE write_register (SPU_REGNUM, val); */
|
| 458 |
|
|
/* OBSOLETE else */
|
| 459 |
|
|
/* OBSOLETE write_register (SPI_REGNUM, val); */
|
| 460 |
|
|
/* OBSOLETE #endif */
|
| 461 |
|
|
/* OBSOLETE write_register (SP_REGNUM, val); */
|
| 462 |
|
|
/* OBSOLETE } */
|
| 463 |
|
|
/* OBSOLETE */
|
| 464 |
|
|
/* OBSOLETE void */
|
| 465 |
|
|
/* OBSOLETE _initialize_tic80_tdep (void) */
|
| 466 |
|
|
/* OBSOLETE { */
|
| 467 |
|
|
/* OBSOLETE tm_print_insn = print_insn_tic80; */
|
| 468 |
|
|
/* OBSOLETE } */
|
