-/* Target-dependent code for the TI TMS320C80 (MVP) for GDB, the GNU debugger.
- Copyright 1996, Free Software Foundation, Inc.
-
- 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 2 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, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
-
-#include "defs.h"
-#include "value.h"
-#include "frame.h"
-#include "inferior.h"
-#include "obstack.h"
-#include "target.h"
-#include "bfd.h"
-#include "gdb_string.h"
-#include "gdbcore.h"
-#include "symfile.h"
-
-/* Function: frame_find_saved_regs
- Return the frame_saved_regs structure for the frame.
- Doesn't really work for dummy frames, but it does pass back
- an empty frame_saved_regs, so I guess that's better than total failure */
-
-void
-tic80_frame_find_saved_regs (fi, regaddr)
- struct frame_info *fi;
- struct frame_saved_regs *regaddr;
-{
- memcpy (regaddr, &fi->fsr, sizeof (struct frame_saved_regs));
-}
-
-/* Function: skip_prologue
- Find end of function prologue. */
-
-CORE_ADDR
-tic80_skip_prologue (pc)
- CORE_ADDR pc;
-{
- CORE_ADDR func_addr, func_end;
- struct symtab_and_line sal;
-
- /* See what the symbol table says */
-
- if (find_pc_partial_function (pc, NULL, &func_addr, &func_end))
- {
- sal = find_pc_line (func_addr, 0);
-
- if (sal.line != 0 && sal.end < func_end)
- return sal.end;
- else
- /* Either there's no line info, or the line after the prologue is after
- the end of the function. In this case, there probably isn't a
- prologue. */
- return pc;
- }
-
- /* We can't find the start of this function, so there's nothing we can do. */
- return pc;
-}
-
-/* Function: tic80_scan_prologue
- This function decodes the target function prologue to determine:
- 1) the size of the stack frame
- 2) which registers are saved on it
- 3) the offsets of saved regs
- 4) the frame size
- This information is stored in the "extra" fields of the frame_info. */
-
-static void
-tic80_scan_prologue (fi)
- struct frame_info *fi;
-{
- struct symtab_and_line sal;
- CORE_ADDR prologue_start, prologue_end, current_pc;
-
- /* Assume there is no frame until proven otherwise. */
- fi->framereg = SP_REGNUM;
- fi->framesize = 0;
- fi->frameoffset = 0;
-
- /* this code essentially duplicates skip_prologue,
- but we need the start address below. */
-
- if (find_pc_partial_function (fi->pc, NULL, &prologue_start, &prologue_end))
- {
- sal = find_pc_line (prologue_start, 0);
-
- if (sal.line == 0) /* no line info, use current PC */
- if (prologue_start != entry_point_address ())
- prologue_end = fi->pc;
- else
- return; /* _start has no frame or prologue */
- else if (sal.end < prologue_end) /* next line begins after fn end */
- prologue_end = sal.end; /* (probably means no prologue) */
- }
- else
-/* FIXME */
- prologue_end = prologue_start + 40; /* We're in the boondocks: allow for */
- /* 16 pushes, an add, and "mv fp,sp" */
-
- prologue_end = min (prologue_end, fi->pc);
-
- /* Now search the prologue looking for instructions that set up the
- frame pointer, adjust the stack pointer, and save registers. */
-
- for (current_pc = prologue_start; current_pc < prologue_end; current_pc += 4)
- {
- unsigned int insn;
- int regno;
- int offset = 0;
-
- insn = read_memory_unsigned_integer (current_pc, 4);
-
- if ((insn & 0x301000) == 0x301000) /* Long immediate? */
-/* FIXME - set offset for long immediate instructions */
- current_pc += 4;
- else
- {
- offset = insn & 0x7fff; /* extract 15-bit offset */
- if (offset & 0x4000) /* if negative, sign-extend */
- offset = -(0x8000 - offset);
- }
-
- if ((insn & 0x7fd0000) == 0x590000) /* st.{w,d} reg, xx(r1) */
- {
- regno = ((insn >> 27) & 0x1f);
- fi->fsr.regs[regno] = offset;
- if (insn & 0x8000) /* 64-bit store (st.d)? */
- fi->fsr.regs[regno + 1] = offset + 4;
- }
- else if ((insn & 0xffff8000) == 0x086c8000) /* addu xx, r1, r1 */
- fi->framesize = -offset;
- else if ((insn & 0xffff8000) == 0xf06c8000) /* addu xx, r1, r30 */
- {
- fi->framereg = FP_REGNUM; /* fp is now valid */
- fi->frameoffset = offset;
- break; /* end of stack adjustments */
- }
- else if (insn == 0xf03b2001) /* addu r1, r0, r30 */
- {
- fi->framereg = FP_REGNUM; /* fp is now valid */
- fi->frameoffset = 0;
- break; /* end of stack adjustments */
- }
- else
-/* FIXME - handle long immediate instructions */
- break; /* anything else isn't prologue */
- }
-}
-
-/* Function: init_extra_frame_info
- This function actually figures out the frame address for a given pc and
- sp. This is tricky on the c80 because we sometimes don't use an explicit
- frame pointer, and the previous stack pointer isn't necessarily recorded
- on the stack. The only reliable way to get this info is to
- examine the prologue. */
-
-void
-tic80_init_extra_frame_info (fi)
- struct frame_info *fi;
-{
- int reg;
-
- if (fi->next)
- fi->pc = FRAME_SAVED_PC (fi->next);
-
- /* Because zero is a valid register offset relative to SP, we initialize
- the offsets to -1 to indicate unused entries. */
- for (reg = 0; reg < NUM_REGS; reg++)
- fi->fsr.regs[reg] = -1;
-
- if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
- {
- /* We need to setup fi->frame here because run_stack_dummy gets it wrong
- by assuming it's always FP. */
- fi->frame = generic_read_register_dummy (fi->pc, fi->frame, SP_REGNUM);
- fi->framesize = 0;
- fi->frameoffset = 0;
- return;
- }
- else
- {
- tic80_scan_prologue (fi);
-
- if (!fi->next) /* this is the innermost frame? */
- fi->frame = read_register (fi->framereg);
- else
- /* not the innermost frame */
- /* If this function uses FP as the frame register, and the function
- it called saved the FP, get the saved FP. */ if (fi->framereg == FP_REGNUM &&
- fi->next->fsr.regs[FP_REGNUM] != (unsigned) -1)
- fi->frame = read_memory_integer (fi->next->fsr.regs[FP_REGNUM], 4);
-
- /* Convert SP-relative offsets of saved registers to real addresses. */
- for (reg = 0; reg < NUM_REGS; reg++)
- if (fi->fsr.regs[reg] == (unsigned) -1)
- fi->fsr.regs[reg] = 0; /* unused entry */
- else
- fi->fsr.regs[reg] += fi->frame - fi->frameoffset;
- }
-}
-
-/* Function: find_callers_reg
- Find REGNUM on the stack. Otherwise, it's in an active register. One thing
- we might want to do here is to check REGNUM against the clobber mask, and
- somehow flag it as invalid if it isn't saved on the stack somewhere. This
- would provide a graceful failure mode when trying to get the value of
- caller-saves registers for an inner frame. */
-
-CORE_ADDR
-tic80_find_callers_reg (fi, regnum)
- struct frame_info *fi;
- int regnum;
-{
- for (; fi; fi = fi->next)
- if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
- return generic_read_register_dummy (fi->pc, fi->frame, regnum);
- else if (fi->fsr.regs[regnum] != 0)
- return read_memory_integer (fi->fsr.regs[regnum],
- REGISTER_RAW_SIZE (regnum));
- return read_register (regnum);
-}
-
-/* Function: frame_chain
- Given a GDB frame, determine the address of the calling function's frame.
- This will be used to create a new GDB frame struct, and then
- INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC will be called for the new frame.
- For c80, we save the frame size when we initialize the frame_info. */
-
-CORE_ADDR
-tic80_frame_chain (fi)
- struct frame_info *fi;
-{
- CORE_ADDR fn_start, callers_pc, fp;
-
- /* is this a dummy frame? */
- if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
- return fi->frame; /* dummy frame same as caller's frame */
-
- /* is caller-of-this a dummy frame? */
- callers_pc = FRAME_SAVED_PC (fi); /* find out who called us: */
- fp = tic80_find_callers_reg (fi, FP_REGNUM);
- if (PC_IN_CALL_DUMMY (callers_pc, fp, fp))
- return fp; /* dummy frame's frame may bear no relation to ours */
-
- if (find_pc_partial_function (fi->pc, 0, &fn_start, 0))
- if (fn_start == entry_point_address ())
- return 0; /* in _start fn, don't chain further */
-
- if (fi->framereg == FP_REGNUM)
- return tic80_find_callers_reg (fi, FP_REGNUM);
- else
- return fi->frame + fi->framesize;
-}
-
-/* Function: pop_frame
- Discard from the stack the innermost frame,
- restoring all saved registers. */
-
-struct frame_info *
-tic80_pop_frame (frame)
- struct frame_info *frame;
-{
- int regnum;
-
- if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame))
- generic_pop_dummy_frame ();
- else
- {
- for (regnum = 0; regnum < NUM_REGS; regnum++)
- if (frame->fsr.regs[regnum] != 0)
- write_register (regnum,
- read_memory_integer (frame->fsr.regs[regnum], 4));
-
- write_register (PC_REGNUM, FRAME_SAVED_PC (frame));
- write_register (SP_REGNUM, read_register (FP_REGNUM));
-#if 0
- if (read_register (PSW_REGNUM) & 0x80)
- write_register (SPU_REGNUM, read_register (SP_REGNUM));
- else
- write_register (SPI_REGNUM, read_register (SP_REGNUM));
-#endif
- }
- flush_cached_frames ();
- return NULL;
-}
-
-/* Function: frame_saved_pc
- Find the caller of this frame. We do this by seeing if LR_REGNUM is saved
- in the stack anywhere, otherwise we get it from the registers. */
-
-CORE_ADDR
-tic80_frame_saved_pc (fi)
- struct frame_info *fi;
-{
- if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
- return generic_read_register_dummy (fi->pc, fi->frame, PC_REGNUM);
- else
- return tic80_find_callers_reg (fi, LR_REGNUM);
-}
-
-/* Function: tic80_push_return_address (pc, sp)
- Set up the return address for the inferior function call.
- Necessary for targets that don't actually execute a JSR/BSR instruction
- (ie. when using an empty CALL_DUMMY) */
-
-CORE_ADDR
-tic80_push_return_address (pc, sp)
- CORE_ADDR pc;
- CORE_ADDR sp;
-{
- write_register (LR_REGNUM, CALL_DUMMY_ADDRESS ());
- return sp;
-}
-
-
-/* Function: push_arguments
- Setup the function arguments for calling a function in the inferior.
-
- On the TI C80 architecture, there are six register pairs (R2/R3 to R12/13)
- which are dedicated for passing function arguments. Up to the first six
- arguments (depending on size) may go into these registers.
- The rest go on the stack.
-
- Arguments that are smaller than 4 bytes will still take up a whole
- register or a whole 32-bit word on the stack, and will be
- right-justified in the register or the stack word. This includes
- chars, shorts, and small aggregate types.
-
- Arguments that are four bytes or less in size are placed in the
- even-numbered register of a register pair, and the odd-numbered
- register is not used.
-
- Arguments of 8 bytes size (such as floating point doubles) are placed
- in a register pair. The least significant 32-bit word is placed in
- the even-numbered register, and the most significant word in the
- odd-numbered register.
-
- Aggregate types with sizes between 4 and 8 bytes are passed
- entirely on the stack, and are left-justified within the
- double-word (as opposed to aggregates smaller than 4 bytes
- which are right-justified).
-
- Aggregates of greater than 8 bytes are first copied onto the stack,
- and then a pointer to the copy is passed in the place of the normal
- argument (either in a register if available, or on the stack).
-
- Functions that must return an aggregate type can return it in the
- normal return value registers (R2 and R3) if its size is 8 bytes or
- less. For larger return values, the caller must allocate space for
- the callee to copy the return value to. A pointer to this space is
- passed as an implicit first argument, always in R0. */
-
-CORE_ADDR
-tic80_push_arguments (nargs, args, sp, struct_return, struct_addr)
- int nargs;
- value_ptr *args;
- CORE_ADDR sp;
- unsigned char struct_return;
- CORE_ADDR struct_addr;
-{
- int stack_offset, stack_alloc;
- int argreg;
- int argnum;
- struct type *type;
- CORE_ADDR regval;
- char *val;
- char valbuf[4];
- int len;
- int odd_sized_struct;
- int is_struct;
-
- /* first force sp to a 4-byte alignment */
- sp = sp & ~3;
-
- argreg = ARG0_REGNUM;
- /* The "struct return pointer" pseudo-argument goes in R0 */
- if (struct_return)
- write_register (argreg++, struct_addr);
-
- /* Now make sure there's space on the stack */
- for (argnum = 0, stack_alloc = 0;
- argnum < nargs; argnum++)
- stack_alloc += ((TYPE_LENGTH (VALUE_TYPE (args[argnum])) + 3) & ~3);
- sp -= stack_alloc; /* make room on stack for args */
-
-
- /* Now load as many as possible of the first arguments into
- registers, and push the rest onto the stack. There are 16 bytes
- in four registers available. Loop thru args from first to last. */
-
- argreg = ARG0_REGNUM;
- for (argnum = 0, stack_offset = 0; argnum < nargs; argnum++)
- {
- type = VALUE_TYPE (args[argnum]);
- len = TYPE_LENGTH (type);
- memset (valbuf, 0, sizeof (valbuf));
- val = (char *) VALUE_CONTENTS (args[argnum]);
-
-/* FIXME -- tic80 can take doubleword arguments in register pairs */
- is_struct = (type->code == TYPE_CODE_STRUCT);
- odd_sized_struct = 0;
-
- if (!is_struct)
- {
- if (len < 4)
- { /* value gets right-justified in the register or stack word */
- memcpy (valbuf + (4 - len), val, len);
- val = valbuf;
- }
- if (len > 4 && (len & 3) != 0)
- odd_sized_struct = 1; /* such structs go entirely on stack */
- }
- else
- {
- /* Structs are always passed by reference. */
- write_register (argreg, sp + stack_offset);
- argreg++;
- }
-
- while (len > 0)
- {
- if (is_struct || argreg > ARGLAST_REGNUM || odd_sized_struct)
- { /* must go on the stack */
- write_memory (sp + stack_offset, val, 4);
- stack_offset += 4;
- }
- /* NOTE WELL!!!!! This is not an "else if" clause!!!
- That's because some things get passed on the stack
- AND in the registers! */
- if (!is_struct && argreg <= ARGLAST_REGNUM)
- { /* there's room in a register */
- regval = extract_address (val, REGISTER_RAW_SIZE (argreg));
- write_register (argreg, regval);
- argreg += 2; /* FIXME -- what about doubleword args? */
- }
- /* Store the value 4 bytes at a time. This means that things
- larger than 4 bytes may go partly in registers and partly
- on the stack. */
- len -= REGISTER_RAW_SIZE (argreg);
- val += REGISTER_RAW_SIZE (argreg);
- }
- }
- return sp;
-}
-
-/* Function: tic80_write_sp
- Because SP is really a read-only register that mirrors either SPU or SPI,
- we must actually write one of those two as well, depending on PSW. */
-
-void
-tic80_write_sp (val)
- CORE_ADDR val;
-{
-#if 0
- unsigned long psw = read_register (PSW_REGNUM);
-
- if (psw & 0x80) /* stack mode: user or interrupt */
- write_register (SPU_REGNUM, val);
- else
- write_register (SPI_REGNUM, val);
-#endif
- write_register (SP_REGNUM, val);
-}
-
-void
-_initialize_tic80_tdep ()
-{
- tm_print_insn = print_insn_tic80;
-}
+/* OBSOLETE /* Target-dependent code for the TI TMS320C80 (MVP) for GDB, the GNU debugger. */
+/* OBSOLETE Copyright 1996, 1997, 1999, 2000, 2001 Free Software Foundation, Inc. */
+/* OBSOLETE */
+/* OBSOLETE This file is part of GDB. */
+/* OBSOLETE */
+/* OBSOLETE This program is free software; you can redistribute it and/or modify */
+/* OBSOLETE it under the terms of the GNU General Public License as published by */
+/* OBSOLETE the Free Software Foundation; either version 2 of the License, or */
+/* OBSOLETE (at your option) any later version. */
+/* OBSOLETE */
+/* OBSOLETE This program is distributed in the hope that it will be useful, */
+/* OBSOLETE but WITHOUT ANY WARRANTY; without even the implied warranty of */
+/* OBSOLETE MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */
+/* OBSOLETE GNU General Public License for more details. */
+/* OBSOLETE */
+/* OBSOLETE You should have received a copy of the GNU General Public License */
+/* OBSOLETE along with this program; if not, write to the Free Software */
+/* OBSOLETE Foundation, Inc., 59 Temple Place - Suite 330, */
+/* OBSOLETE Boston, MA 02111-1307, USA. */ */
+/* OBSOLETE */
+/* OBSOLETE #include "defs.h" */
+/* OBSOLETE #include "value.h" */
+/* OBSOLETE #include "frame.h" */
+/* OBSOLETE #include "inferior.h" */
+/* OBSOLETE #include "obstack.h" */
+/* OBSOLETE #include "target.h" */
+/* OBSOLETE #include "bfd.h" */
+/* OBSOLETE #include "gdb_string.h" */
+/* OBSOLETE #include "gdbcore.h" */
+/* OBSOLETE #include "symfile.h" */
+/* OBSOLETE #include "regcache.h" */
+/* OBSOLETE */
+/* OBSOLETE /* Function: frame_find_saved_regs */
+/* OBSOLETE Return the frame_saved_regs structure for the frame. */
+/* OBSOLETE Doesn't really work for dummy frames, but it does pass back */
+/* OBSOLETE an empty frame_saved_regs, so I guess that's better than total failure */ */
+/* OBSOLETE */
+/* OBSOLETE void */
+/* OBSOLETE tic80_frame_find_saved_regs (struct frame_info *fi, */
+/* OBSOLETE struct frame_saved_regs *regaddr) */
+/* OBSOLETE { */
+/* OBSOLETE memcpy (regaddr, &fi->fsr, sizeof (struct frame_saved_regs)); */
+/* OBSOLETE } */
+/* OBSOLETE */
+/* OBSOLETE /* Function: skip_prologue */
+/* OBSOLETE Find end of function prologue. */ */
+/* OBSOLETE */
+/* OBSOLETE CORE_ADDR */
+/* OBSOLETE tic80_skip_prologue (CORE_ADDR pc) */
+/* OBSOLETE { */
+/* OBSOLETE CORE_ADDR func_addr, func_end; */
+/* OBSOLETE struct symtab_and_line sal; */
+/* OBSOLETE */
+/* OBSOLETE /* See what the symbol table says */ */
+/* OBSOLETE */
+/* OBSOLETE if (find_pc_partial_function (pc, NULL, &func_addr, &func_end)) */
+/* OBSOLETE { */
+/* OBSOLETE sal = find_pc_line (func_addr, 0); */
+/* OBSOLETE */
+/* OBSOLETE if (sal.line != 0 && sal.end < func_end) */
+/* OBSOLETE return sal.end; */
+/* OBSOLETE else */
+/* OBSOLETE /* Either there's no line info, or the line after the prologue is after */
+/* OBSOLETE the end of the function. In this case, there probably isn't a */
+/* OBSOLETE prologue. */ */
+/* OBSOLETE return pc; */
+/* OBSOLETE } */
+/* OBSOLETE */
+/* OBSOLETE /* We can't find the start of this function, so there's nothing we can do. */ */
+/* OBSOLETE return pc; */
+/* OBSOLETE } */
+/* OBSOLETE */
+/* OBSOLETE /* Function: tic80_scan_prologue */
+/* OBSOLETE This function decodes the target function prologue to determine: */
+/* OBSOLETE 1) the size of the stack frame */
+/* OBSOLETE 2) which registers are saved on it */
+/* OBSOLETE 3) the offsets of saved regs */
+/* OBSOLETE 4) the frame size */
+/* OBSOLETE This information is stored in the "extra" fields of the frame_info. */ */
+/* OBSOLETE */
+/* OBSOLETE static void */
+/* OBSOLETE tic80_scan_prologue (struct frame_info *fi) */
+/* OBSOLETE { */
+/* OBSOLETE struct symtab_and_line sal; */
+/* OBSOLETE CORE_ADDR prologue_start, prologue_end, current_pc; */
+/* OBSOLETE */
+/* OBSOLETE /* Assume there is no frame until proven otherwise. */ */
+/* OBSOLETE fi->framereg = SP_REGNUM; */
+/* OBSOLETE fi->framesize = 0; */
+/* OBSOLETE fi->frameoffset = 0; */
+/* OBSOLETE */
+/* OBSOLETE /* this code essentially duplicates skip_prologue, */
+/* OBSOLETE but we need the start address below. */ */
+/* OBSOLETE */
+/* OBSOLETE if (find_pc_partial_function (fi->pc, NULL, &prologue_start, &prologue_end)) */
+/* OBSOLETE { */
+/* OBSOLETE sal = find_pc_line (prologue_start, 0); */
+/* OBSOLETE */
+/* OBSOLETE if (sal.line == 0) /* no line info, use current PC */ */
+/* OBSOLETE if (prologue_start != entry_point_address ()) */
+/* OBSOLETE prologue_end = fi->pc; */
+/* OBSOLETE else */
+/* OBSOLETE return; /* _start has no frame or prologue */ */
+/* OBSOLETE else if (sal.end < prologue_end) /* next line begins after fn end */ */
+/* OBSOLETE prologue_end = sal.end; /* (probably means no prologue) */ */
+/* OBSOLETE } */
+/* OBSOLETE else */
+/* OBSOLETE /* FIXME */ */
+/* OBSOLETE prologue_end = prologue_start + 40; /* We're in the boondocks: allow for */ */
+/* OBSOLETE /* 16 pushes, an add, and "mv fp,sp" */ */
+/* OBSOLETE */
+/* OBSOLETE prologue_end = min (prologue_end, fi->pc); */
+/* OBSOLETE */
+/* OBSOLETE /* Now search the prologue looking for instructions that set up the */
+/* OBSOLETE frame pointer, adjust the stack pointer, and save registers. */ */
+/* OBSOLETE */
+/* OBSOLETE for (current_pc = prologue_start; current_pc < prologue_end; current_pc += 4) */
+/* OBSOLETE { */
+/* OBSOLETE unsigned int insn; */
+/* OBSOLETE int regno; */
+/* OBSOLETE int offset = 0; */
+/* OBSOLETE */
+/* OBSOLETE insn = read_memory_unsigned_integer (current_pc, 4); */
+/* OBSOLETE */
+/* OBSOLETE if ((insn & 0x301000) == 0x301000) /* Long immediate? */ */
+/* OBSOLETE /* FIXME - set offset for long immediate instructions */ */
+/* OBSOLETE current_pc += 4; */
+/* OBSOLETE else */
+/* OBSOLETE { */
+/* OBSOLETE offset = insn & 0x7fff; /* extract 15-bit offset */ */
+/* OBSOLETE if (offset & 0x4000) /* if negative, sign-extend */ */
+/* OBSOLETE offset = -(0x8000 - offset); */
+/* OBSOLETE } */
+/* OBSOLETE */
+/* OBSOLETE if ((insn & 0x7fd0000) == 0x590000) /* st.{w,d} reg, xx(r1) */ */
+/* OBSOLETE { */
+/* OBSOLETE regno = ((insn >> 27) & 0x1f); */
+/* OBSOLETE fi->fsr.regs[regno] = offset; */
+/* OBSOLETE if (insn & 0x8000) /* 64-bit store (st.d)? */ */
+/* OBSOLETE fi->fsr.regs[regno + 1] = offset + 4; */
+/* OBSOLETE } */
+/* OBSOLETE else if ((insn & 0xffff8000) == 0x086c8000) /* addu xx, r1, r1 */ */
+/* OBSOLETE fi->framesize = -offset; */
+/* OBSOLETE else if ((insn & 0xffff8000) == 0xf06c8000) /* addu xx, r1, r30 */ */
+/* OBSOLETE { */
+/* OBSOLETE fi->framereg = FP_REGNUM; /* fp is now valid */ */
+/* OBSOLETE fi->frameoffset = offset; */
+/* OBSOLETE break; /* end of stack adjustments */ */
+/* OBSOLETE } */
+/* OBSOLETE else if (insn == 0xf03b2001) /* addu r1, r0, r30 */ */
+/* OBSOLETE { */
+/* OBSOLETE fi->framereg = FP_REGNUM; /* fp is now valid */ */
+/* OBSOLETE fi->frameoffset = 0; */
+/* OBSOLETE break; /* end of stack adjustments */ */
+/* OBSOLETE } */
+/* OBSOLETE else */
+/* OBSOLETE /* FIXME - handle long immediate instructions */ */
+/* OBSOLETE break; /* anything else isn't prologue */ */
+/* OBSOLETE } */
+/* OBSOLETE } */
+/* OBSOLETE */
+/* OBSOLETE /* Function: init_extra_frame_info */
+/* OBSOLETE This function actually figures out the frame address for a given pc and */
+/* OBSOLETE sp. This is tricky on the c80 because we sometimes don't use an explicit */
+/* OBSOLETE frame pointer, and the previous stack pointer isn't necessarily recorded */
+/* OBSOLETE on the stack. The only reliable way to get this info is to */
+/* OBSOLETE examine the prologue. */ */
+/* OBSOLETE */
+/* OBSOLETE void */
+/* OBSOLETE tic80_init_extra_frame_info (struct frame_info *fi) */
+/* OBSOLETE { */
+/* OBSOLETE int reg; */
+/* OBSOLETE */
+/* OBSOLETE if (fi->next) */
+/* OBSOLETE fi->pc = FRAME_SAVED_PC (fi->next); */
+/* OBSOLETE */
+/* OBSOLETE /* Because zero is a valid register offset relative to SP, we initialize */
+/* OBSOLETE the offsets to -1 to indicate unused entries. */ */
+/* OBSOLETE for (reg = 0; reg < NUM_REGS; reg++) */
+/* OBSOLETE fi->fsr.regs[reg] = -1; */
+/* OBSOLETE */
+/* OBSOLETE if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) */
+/* OBSOLETE { */
+/* OBSOLETE /* We need to setup fi->frame here because run_stack_dummy gets it wrong */
+/* OBSOLETE by assuming it's always FP. */ */
+/* OBSOLETE fi->frame = generic_read_register_dummy (fi->pc, fi->frame, SP_REGNUM); */
+/* OBSOLETE fi->framesize = 0; */
+/* OBSOLETE fi->frameoffset = 0; */
+/* OBSOLETE return; */
+/* OBSOLETE } */
+/* OBSOLETE else */
+/* OBSOLETE { */
+/* OBSOLETE tic80_scan_prologue (fi); */
+/* OBSOLETE */
+/* OBSOLETE if (!fi->next) /* this is the innermost frame? */ */
+/* OBSOLETE fi->frame = read_register (fi->framereg); */
+/* OBSOLETE else */
+/* OBSOLETE /* not the innermost frame */ */
+/* OBSOLETE /* If this function uses FP as the frame register, and the function */
+/* OBSOLETE it called saved the FP, get the saved FP. */ if (fi->framereg == FP_REGNUM && */
+/* OBSOLETE fi->next->fsr.regs[FP_REGNUM] != (unsigned) -1) */
+/* OBSOLETE fi->frame = read_memory_integer (fi->next->fsr.regs[FP_REGNUM], 4); */
+/* OBSOLETE */
+/* OBSOLETE /* Convert SP-relative offsets of saved registers to real addresses. */ */
+/* OBSOLETE for (reg = 0; reg < NUM_REGS; reg++) */
+/* OBSOLETE if (fi->fsr.regs[reg] == (unsigned) -1) */
+/* OBSOLETE fi->fsr.regs[reg] = 0; /* unused entry */ */
+/* OBSOLETE else */
+/* OBSOLETE fi->fsr.regs[reg] += fi->frame - fi->frameoffset; */
+/* OBSOLETE } */
+/* OBSOLETE } */
+/* OBSOLETE */
+/* OBSOLETE /* Function: find_callers_reg */
+/* OBSOLETE Find REGNUM on the stack. Otherwise, it's in an active register. One thing */
+/* OBSOLETE we might want to do here is to check REGNUM against the clobber mask, and */
+/* OBSOLETE somehow flag it as invalid if it isn't saved on the stack somewhere. This */
+/* OBSOLETE would provide a graceful failure mode when trying to get the value of */
+/* OBSOLETE caller-saves registers for an inner frame. */ */
+/* OBSOLETE */
+/* OBSOLETE CORE_ADDR */
+/* OBSOLETE tic80_find_callers_reg (struct frame_info *fi, int regnum) */
+/* OBSOLETE { */
+/* OBSOLETE for (; fi; fi = fi->next) */
+/* OBSOLETE if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) */
+/* OBSOLETE return generic_read_register_dummy (fi->pc, fi->frame, regnum); */
+/* OBSOLETE else if (fi->fsr.regs[regnum] != 0) */
+/* OBSOLETE return read_memory_integer (fi->fsr.regs[regnum], */
+/* OBSOLETE REGISTER_RAW_SIZE (regnum)); */
+/* OBSOLETE return read_register (regnum); */
+/* OBSOLETE } */
+/* OBSOLETE */
+/* OBSOLETE /* Function: frame_chain */
+/* OBSOLETE Given a GDB frame, determine the address of the calling function's frame. */
+/* OBSOLETE This will be used to create a new GDB frame struct, and then */
+/* OBSOLETE INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC will be called for the new frame. */
+/* OBSOLETE For c80, we save the frame size when we initialize the frame_info. */ */
+/* OBSOLETE */
+/* OBSOLETE CORE_ADDR */
+/* OBSOLETE tic80_frame_chain (struct frame_info *fi) */
+/* OBSOLETE { */
+/* OBSOLETE CORE_ADDR fn_start, callers_pc, fp; */
+/* OBSOLETE */
+/* OBSOLETE /* is this a dummy frame? */ */
+/* OBSOLETE if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) */
+/* OBSOLETE return fi->frame; /* dummy frame same as caller's frame */ */
+/* OBSOLETE */
+/* OBSOLETE /* is caller-of-this a dummy frame? */ */
+/* OBSOLETE callers_pc = FRAME_SAVED_PC (fi); /* find out who called us: */ */
+/* OBSOLETE fp = tic80_find_callers_reg (fi, FP_REGNUM); */
+/* OBSOLETE if (PC_IN_CALL_DUMMY (callers_pc, fp, fp)) */
+/* OBSOLETE return fp; /* dummy frame's frame may bear no relation to ours */ */
+/* OBSOLETE */
+/* OBSOLETE if (find_pc_partial_function (fi->pc, 0, &fn_start, 0)) */
+/* OBSOLETE if (fn_start == entry_point_address ()) */
+/* OBSOLETE return 0; /* in _start fn, don't chain further */ */
+/* OBSOLETE */
+/* OBSOLETE if (fi->framereg == FP_REGNUM) */
+/* OBSOLETE return tic80_find_callers_reg (fi, FP_REGNUM); */
+/* OBSOLETE else */
+/* OBSOLETE return fi->frame + fi->framesize; */
+/* OBSOLETE } */
+/* OBSOLETE */
+/* OBSOLETE /* Function: pop_frame */
+/* OBSOLETE Discard from the stack the innermost frame, */
+/* OBSOLETE restoring all saved registers. */ */
+/* OBSOLETE */
+/* OBSOLETE struct frame_info * */
+/* OBSOLETE tic80_pop_frame (struct frame_info *frame) */
+/* OBSOLETE { */
+/* OBSOLETE int regnum; */
+/* OBSOLETE */
+/* OBSOLETE if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame)) */
+/* OBSOLETE generic_pop_dummy_frame (); */
+/* OBSOLETE else */
+/* OBSOLETE { */
+/* OBSOLETE for (regnum = 0; regnum < NUM_REGS; regnum++) */
+/* OBSOLETE if (frame->fsr.regs[regnum] != 0) */
+/* OBSOLETE write_register (regnum, */
+/* OBSOLETE read_memory_integer (frame->fsr.regs[regnum], 4)); */
+/* OBSOLETE */
+/* OBSOLETE write_register (PC_REGNUM, FRAME_SAVED_PC (frame)); */
+/* OBSOLETE write_register (SP_REGNUM, read_register (FP_REGNUM)); */
+/* OBSOLETE #if 0 */
+/* OBSOLETE if (read_register (PSW_REGNUM) & 0x80) */
+/* OBSOLETE write_register (SPU_REGNUM, read_register (SP_REGNUM)); */
+/* OBSOLETE else */
+/* OBSOLETE write_register (SPI_REGNUM, read_register (SP_REGNUM)); */
+/* OBSOLETE #endif */
+/* OBSOLETE } */
+/* OBSOLETE flush_cached_frames (); */
+/* OBSOLETE return NULL; */
+/* OBSOLETE } */
+/* OBSOLETE */
+/* OBSOLETE /* Function: frame_saved_pc */
+/* OBSOLETE Find the caller of this frame. We do this by seeing if LR_REGNUM is saved */
+/* OBSOLETE in the stack anywhere, otherwise we get it from the registers. */ */
+/* OBSOLETE */
+/* OBSOLETE CORE_ADDR */
+/* OBSOLETE tic80_frame_saved_pc (struct frame_info *fi) */
+/* OBSOLETE { */
+/* OBSOLETE if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) */
+/* OBSOLETE return generic_read_register_dummy (fi->pc, fi->frame, PC_REGNUM); */
+/* OBSOLETE else */
+/* OBSOLETE return tic80_find_callers_reg (fi, LR_REGNUM); */
+/* OBSOLETE } */
+/* OBSOLETE */
+/* OBSOLETE /* Function: tic80_push_return_address (pc, sp) */
+/* OBSOLETE Set up the return address for the inferior function call. */
+/* OBSOLETE Necessary for targets that don't actually execute a JSR/BSR instruction */
+/* OBSOLETE (ie. when using an empty CALL_DUMMY) */ */
+/* OBSOLETE */
+/* OBSOLETE CORE_ADDR */
+/* OBSOLETE tic80_push_return_address (CORE_ADDR pc, CORE_ADDR sp) */
+/* OBSOLETE { */
+/* OBSOLETE write_register (LR_REGNUM, CALL_DUMMY_ADDRESS ()); */
+/* OBSOLETE return sp; */
+/* OBSOLETE } */
+/* OBSOLETE */
+/* OBSOLETE */
+/* OBSOLETE /* Function: push_arguments */
+/* OBSOLETE Setup the function arguments for calling a function in the inferior. */
+/* OBSOLETE */
+/* OBSOLETE On the TI C80 architecture, there are six register pairs (R2/R3 to R12/13) */
+/* OBSOLETE which are dedicated for passing function arguments. Up to the first six */
+/* OBSOLETE arguments (depending on size) may go into these registers. */
+/* OBSOLETE The rest go on the stack. */
+/* OBSOLETE */
+/* OBSOLETE Arguments that are smaller than 4 bytes will still take up a whole */
+/* OBSOLETE register or a whole 32-bit word on the stack, and will be */
+/* OBSOLETE right-justified in the register or the stack word. This includes */
+/* OBSOLETE chars, shorts, and small aggregate types. */
+/* OBSOLETE */
+/* OBSOLETE Arguments that are four bytes or less in size are placed in the */
+/* OBSOLETE even-numbered register of a register pair, and the odd-numbered */
+/* OBSOLETE register is not used. */
+/* OBSOLETE */
+/* OBSOLETE Arguments of 8 bytes size (such as floating point doubles) are placed */
+/* OBSOLETE in a register pair. The least significant 32-bit word is placed in */
+/* OBSOLETE the even-numbered register, and the most significant word in the */
+/* OBSOLETE odd-numbered register. */
+/* OBSOLETE */
+/* OBSOLETE Aggregate types with sizes between 4 and 8 bytes are passed */
+/* OBSOLETE entirely on the stack, and are left-justified within the */
+/* OBSOLETE double-word (as opposed to aggregates smaller than 4 bytes */
+/* OBSOLETE which are right-justified). */
+/* OBSOLETE */
+/* OBSOLETE Aggregates of greater than 8 bytes are first copied onto the stack, */
+/* OBSOLETE and then a pointer to the copy is passed in the place of the normal */
+/* OBSOLETE argument (either in a register if available, or on the stack). */
+/* OBSOLETE */
+/* OBSOLETE Functions that must return an aggregate type can return it in the */
+/* OBSOLETE normal return value registers (R2 and R3) if its size is 8 bytes or */
+/* OBSOLETE less. For larger return values, the caller must allocate space for */
+/* OBSOLETE the callee to copy the return value to. A pointer to this space is */
+/* OBSOLETE passed as an implicit first argument, always in R0. */ */
+/* OBSOLETE */
+/* OBSOLETE CORE_ADDR */
+/* OBSOLETE tic80_push_arguments (int nargs, value_ptr *args, CORE_ADDR sp, */
+/* OBSOLETE unsigned char struct_return, CORE_ADDR struct_addr) */
+/* OBSOLETE { */
+/* OBSOLETE int stack_offset, stack_alloc; */
+/* OBSOLETE int argreg; */
+/* OBSOLETE int argnum; */
+/* OBSOLETE struct type *type; */
+/* OBSOLETE CORE_ADDR regval; */
+/* OBSOLETE char *val; */
+/* OBSOLETE char valbuf[4]; */
+/* OBSOLETE int len; */
+/* OBSOLETE int odd_sized_struct; */
+/* OBSOLETE int is_struct; */
+/* OBSOLETE */
+/* OBSOLETE /* first force sp to a 4-byte alignment */ */
+/* OBSOLETE sp = sp & ~3; */
+/* OBSOLETE */
+/* OBSOLETE argreg = ARG0_REGNUM; */
+/* OBSOLETE /* The "struct return pointer" pseudo-argument goes in R0 */ */
+/* OBSOLETE if (struct_return) */
+/* OBSOLETE write_register (argreg++, struct_addr); */
+/* OBSOLETE */
+/* OBSOLETE /* Now make sure there's space on the stack */ */
+/* OBSOLETE for (argnum = 0, stack_alloc = 0; */
+/* OBSOLETE argnum < nargs; argnum++) */
+/* OBSOLETE stack_alloc += ((TYPE_LENGTH (VALUE_TYPE (args[argnum])) + 3) & ~3); */
+/* OBSOLETE sp -= stack_alloc; /* make room on stack for args */ */
+/* OBSOLETE */
+/* OBSOLETE */
+/* OBSOLETE /* Now load as many as possible of the first arguments into */
+/* OBSOLETE registers, and push the rest onto the stack. There are 16 bytes */
+/* OBSOLETE in four registers available. Loop thru args from first to last. */ */
+/* OBSOLETE */
+/* OBSOLETE argreg = ARG0_REGNUM; */
+/* OBSOLETE for (argnum = 0, stack_offset = 0; argnum < nargs; argnum++) */
+/* OBSOLETE { */
+/* OBSOLETE type = VALUE_TYPE (args[argnum]); */
+/* OBSOLETE len = TYPE_LENGTH (type); */
+/* OBSOLETE memset (valbuf, 0, sizeof (valbuf)); */
+/* OBSOLETE val = (char *) VALUE_CONTENTS (args[argnum]); */
+/* OBSOLETE */
+/* OBSOLETE /* FIXME -- tic80 can take doubleword arguments in register pairs */ */
+/* OBSOLETE is_struct = (type->code == TYPE_CODE_STRUCT); */
+/* OBSOLETE odd_sized_struct = 0; */
+/* OBSOLETE */
+/* OBSOLETE if (!is_struct) */
+/* OBSOLETE { */
+/* OBSOLETE if (len < 4) */
+/* OBSOLETE { /* value gets right-justified in the register or stack word */ */
+/* OBSOLETE memcpy (valbuf + (4 - len), val, len); */
+/* OBSOLETE val = valbuf; */
+/* OBSOLETE } */
+/* OBSOLETE if (len > 4 && (len & 3) != 0) */
+/* OBSOLETE odd_sized_struct = 1; /* such structs go entirely on stack */ */
+/* OBSOLETE } */
+/* OBSOLETE else */
+/* OBSOLETE { */
+/* OBSOLETE /* Structs are always passed by reference. */ */
+/* OBSOLETE write_register (argreg, sp + stack_offset); */
+/* OBSOLETE argreg++; */
+/* OBSOLETE } */
+/* OBSOLETE */
+/* OBSOLETE while (len > 0) */
+/* OBSOLETE { */
+/* OBSOLETE if (is_struct || argreg > ARGLAST_REGNUM || odd_sized_struct) */
+/* OBSOLETE { /* must go on the stack */ */
+/* OBSOLETE write_memory (sp + stack_offset, val, 4); */
+/* OBSOLETE stack_offset += 4; */
+/* OBSOLETE } */
+/* OBSOLETE /* NOTE WELL!!!!! This is not an "else if" clause!!! */
+/* OBSOLETE That's because some things get passed on the stack */
+/* OBSOLETE AND in the registers! */ */
+/* OBSOLETE if (!is_struct && argreg <= ARGLAST_REGNUM) */
+/* OBSOLETE { /* there's room in a register */ */
+/* OBSOLETE regval = extract_address (val, REGISTER_RAW_SIZE (argreg)); */
+/* OBSOLETE write_register (argreg, regval); */
+/* OBSOLETE argreg += 2; /* FIXME -- what about doubleword args? */ */
+/* OBSOLETE } */
+/* OBSOLETE /* Store the value 4 bytes at a time. This means that things */
+/* OBSOLETE larger than 4 bytes may go partly in registers and partly */
+/* OBSOLETE on the stack. */ */
+/* OBSOLETE len -= REGISTER_RAW_SIZE (argreg); */
+/* OBSOLETE val += REGISTER_RAW_SIZE (argreg); */
+/* OBSOLETE } */
+/* OBSOLETE } */
+/* OBSOLETE return sp; */
+/* OBSOLETE } */
+/* OBSOLETE */
+/* OBSOLETE /* Function: tic80_write_sp */
+/* OBSOLETE Because SP is really a read-only register that mirrors either SPU or SPI, */
+/* OBSOLETE we must actually write one of those two as well, depending on PSW. */ */
+/* OBSOLETE */
+/* OBSOLETE void */
+/* OBSOLETE tic80_write_sp (CORE_ADDR val) */
+/* OBSOLETE { */
+/* OBSOLETE #if 0 */
+/* OBSOLETE unsigned long psw = read_register (PSW_REGNUM); */
+/* OBSOLETE */
+/* OBSOLETE if (psw & 0x80) /* stack mode: user or interrupt */ */
+/* OBSOLETE write_register (SPU_REGNUM, val); */
+/* OBSOLETE else */
+/* OBSOLETE write_register (SPI_REGNUM, val); */
+/* OBSOLETE #endif */
+/* OBSOLETE write_register (SP_REGNUM, val); */
+/* OBSOLETE } */
+/* OBSOLETE */
+/* OBSOLETE void */
+/* OBSOLETE _initialize_tic80_tdep (void) */
+/* OBSOLETE { */
+/* OBSOLETE tm_print_insn = print_insn_tic80; */
+/* OBSOLETE } */
projects / deliverable / binutils-gdb.git / blobdiff