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-rw-r--r--gdb/frv-tdep.c1173
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diff --git a/gdb/frv-tdep.c b/gdb/frv-tdep.c
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-/* Target-dependent code for the Fujitsu FR-V, for GDB, the GNU Debugger.
- Copyright 2002 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 "inferior.h"
-#include "symfile.h" /* for entry_point_address */
-#include "gdbcore.h"
-#include "arch-utils.h"
-#include "regcache.h"
-
-extern void _initialize_frv_tdep (void);
-
-static gdbarch_init_ftype frv_gdbarch_init;
-
-static gdbarch_register_name_ftype frv_register_name;
-static gdbarch_register_raw_size_ftype frv_register_raw_size;
-static gdbarch_register_virtual_size_ftype frv_register_virtual_size;
-static gdbarch_register_virtual_type_ftype frv_register_virtual_type;
-static gdbarch_register_byte_ftype frv_register_byte;
-static gdbarch_breakpoint_from_pc_ftype frv_breakpoint_from_pc;
-static gdbarch_frame_chain_ftype frv_frame_chain;
-static gdbarch_frame_saved_pc_ftype frv_frame_saved_pc;
-static gdbarch_skip_prologue_ftype frv_skip_prologue;
-static gdbarch_frame_init_saved_regs_ftype frv_frame_init_saved_regs;
-static gdbarch_deprecated_extract_return_value_ftype frv_extract_return_value;
-static gdbarch_deprecated_extract_struct_value_address_ftype frv_extract_struct_value_address;
-static gdbarch_use_struct_convention_ftype frv_use_struct_convention;
-static gdbarch_frameless_function_invocation_ftype frv_frameless_function_invocation;
-static gdbarch_init_extra_frame_info_ftype stupid_useless_init_extra_frame_info;
-static gdbarch_store_struct_return_ftype frv_store_struct_return;
-static gdbarch_push_arguments_ftype frv_push_arguments;
-static gdbarch_push_return_address_ftype frv_push_return_address;
-static gdbarch_pop_frame_ftype frv_pop_frame;
-static gdbarch_saved_pc_after_call_ftype frv_saved_pc_after_call;
-
-static void frv_pop_frame_regular (struct frame_info *frame);
-
-/* Register numbers. You can change these as needed, but don't forget
- to update the simulator accordingly. */
-enum {
- /* The total number of registers we know exist. */
- frv_num_regs = 147,
-
- /* Register numbers 0 -- 63 are always reserved for general-purpose
- registers. The chip at hand may have less. */
- first_gpr_regnum = 0,
- sp_regnum = 1,
- fp_regnum = 2,
- struct_return_regnum = 3,
- last_gpr_regnum = 63,
-
- /* Register numbers 64 -- 127 are always reserved for floating-point
- registers. The chip at hand may have less. */
- first_fpr_regnum = 64,
- last_fpr_regnum = 127,
-
- /* Register numbers 128 on up are always reserved for special-purpose
- registers. */
- first_spr_regnum = 128,
- pc_regnum = 128,
- psr_regnum = 129,
- ccr_regnum = 130,
- cccr_regnum = 131,
- tbr_regnum = 135,
- brr_regnum = 136,
- dbar0_regnum = 137,
- dbar1_regnum = 138,
- dbar2_regnum = 139,
- dbar3_regnum = 140,
- lr_regnum = 145,
- lcr_regnum = 146,
- last_spr_regnum = 146
-};
-
-static LONGEST frv_call_dummy_words[] =
-{0};
-
-
-/* The contents of this structure can only be trusted after we've
- frv_frame_init_saved_regs on the frame. */
-struct frame_extra_info
- {
- /* The offset from our frame pointer to our caller's stack
- pointer. */
- int fp_to_callers_sp_offset;
-
- /* Non-zero if we've saved our return address on the stack yet.
- Zero if it's still sitting in the link register. */
- int lr_saved_on_stack;
- };
-
-
-/* A structure describing a particular variant of the FRV.
- We allocate and initialize one of these structures when we create
- the gdbarch object for a variant.
-
- At the moment, all the FR variants we support differ only in which
- registers are present; the portable code of GDB knows that
- registers whose names are the empty string don't exist, so the
- `register_names' array captures all the per-variant information we
- need.
-
- in the future, if we need to have per-variant maps for raw size,
- virtual type, etc., we should replace register_names with an array
- of structures, each of which gives all the necessary info for one
- register. Don't stick parallel arrays in here --- that's so
- Fortran. */
-struct gdbarch_tdep
-{
- /* How many general-purpose registers does this variant have? */
- int num_gprs;
-
- /* How many floating-point registers does this variant have? */
- int num_fprs;
-
- /* How many hardware watchpoints can it support? */
- int num_hw_watchpoints;
-
- /* How many hardware breakpoints can it support? */
- int num_hw_breakpoints;
-
- /* Register names. */
- char **register_names;
-};
-
-#define CURRENT_VARIANT (gdbarch_tdep (current_gdbarch))
-
-
-/* Allocate a new variant structure, and set up default values for all
- the fields. */
-static struct gdbarch_tdep *
-new_variant (void)
-{
- struct gdbarch_tdep *var;
- int r;
- char buf[20];
-
- var = xmalloc (sizeof (*var));
- memset (var, 0, sizeof (*var));
-
- var->num_gprs = 64;
- var->num_fprs = 64;
- var->num_hw_watchpoints = 0;
- var->num_hw_breakpoints = 0;
-
- /* By default, don't supply any general-purpose or floating-point
- register names. */
- var->register_names = (char **) xmalloc (frv_num_regs * sizeof (char *));
- for (r = 0; r < frv_num_regs; r++)
- var->register_names[r] = "";
-
- /* Do, however, supply default names for the special-purpose
- registers. */
- for (r = first_spr_regnum; r <= last_spr_regnum; ++r)
- {
- sprintf (buf, "x%d", r);
- var->register_names[r] = xstrdup (buf);
- }
-
- var->register_names[pc_regnum] = "pc";
- var->register_names[lr_regnum] = "lr";
- var->register_names[lcr_regnum] = "lcr";
-
- var->register_names[psr_regnum] = "psr";
- var->register_names[ccr_regnum] = "ccr";
- var->register_names[cccr_regnum] = "cccr";
- var->register_names[tbr_regnum] = "tbr";
-
- /* Debug registers. */
- var->register_names[brr_regnum] = "brr";
- var->register_names[dbar0_regnum] = "dbar0";
- var->register_names[dbar1_regnum] = "dbar1";
- var->register_names[dbar2_regnum] = "dbar2";
- var->register_names[dbar3_regnum] = "dbar3";
-
- return var;
-}
-
-
-/* Indicate that the variant VAR has NUM_GPRS general-purpose
- registers, and fill in the names array appropriately. */
-static void
-set_variant_num_gprs (struct gdbarch_tdep *var, int num_gprs)
-{
- int r;
-
- var->num_gprs = num_gprs;
-
- for (r = 0; r < num_gprs; ++r)
- {
- char buf[20];
-
- sprintf (buf, "gr%d", r);
- var->register_names[first_gpr_regnum + r] = xstrdup (buf);
- }
-}
-
-
-/* Indicate that the variant VAR has NUM_FPRS floating-point
- registers, and fill in the names array appropriately. */
-static void
-set_variant_num_fprs (struct gdbarch_tdep *var, int num_fprs)
-{
- int r;
-
- var->num_fprs = num_fprs;
-
- for (r = 0; r < num_fprs; ++r)
- {
- char buf[20];
-
- sprintf (buf, "fr%d", r);
- var->register_names[first_fpr_regnum + r] = xstrdup (buf);
- }
-}
-
-
-static const char *
-frv_register_name (int reg)
-{
- if (reg < 0)
- return "?toosmall?";
- if (reg >= frv_num_regs)
- return "?toolarge?";
-
- return CURRENT_VARIANT->register_names[reg];
-}
-
-
-static int
-frv_register_raw_size (int reg)
-{
- return 4;
-}
-
-static int
-frv_register_virtual_size (int reg)
-{
- return 4;
-}
-
-static struct type *
-frv_register_virtual_type (int reg)
-{
- if (reg >= 64 && reg <= 127)
- return builtin_type_float;
- else
- return builtin_type_int;
-}
-
-static int
-frv_register_byte (int reg)
-{
- return (reg * 4);
-}
-
-static const unsigned char *
-frv_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenp)
-{
- static unsigned char breakpoint[] = {0xc0, 0x70, 0x00, 0x01};
- *lenp = sizeof (breakpoint);
- return breakpoint;
-}
-
-static CORE_ADDR
-frv_frame_chain (struct frame_info *frame)
-{
- CORE_ADDR saved_fp_addr;
-
- if (frame->saved_regs && frame->saved_regs[fp_regnum] != 0)
- saved_fp_addr = frame->saved_regs[fp_regnum];
- else
- /* Just assume it was saved in the usual place. */
- saved_fp_addr = frame->frame;
-
- return read_memory_integer (saved_fp_addr, 4);
-}
-
-static CORE_ADDR
-frv_frame_saved_pc (struct frame_info *frame)
-{
- frv_frame_init_saved_regs (frame);
-
- /* Perhaps the prologue analyzer recorded where it was stored.
- (As of 14 Oct 2001, it never does.) */
- if (frame->saved_regs && frame->saved_regs[pc_regnum] != 0)
- return read_memory_integer (frame->saved_regs[pc_regnum], 4);
-
- /* If the prologue analyzer tells us the link register was saved on
- the stack, get it from there. */
- if (frame->extra_info->lr_saved_on_stack)
- return read_memory_integer (frame->frame + 8, 4);
-
- /* Otherwise, it's still in LR.
- However, if FRAME isn't the youngest frame, this is kind of
- suspicious --- if this frame called somebody else, then its LR
- has certainly been overwritten. */
- if (! frame->next)
- return read_register (lr_regnum);
-
- /* By default, assume it's saved in the standard place, relative to
- the frame pointer. */
- return read_memory_integer (frame->frame + 8, 4);
-}
-
-
-/* Return true if REG is a caller-saves ("scratch") register,
- false otherwise. */
-static int
-is_caller_saves_reg (int reg)
-{
- return ((4 <= reg && reg <= 7)
- || (14 <= reg && reg <= 15)
- || (32 <= reg && reg <= 47));
-}
-
-
-/* Return true if REG is a callee-saves register, false otherwise. */
-static int
-is_callee_saves_reg (int reg)
-{
- return ((16 <= reg && reg <= 31)
- || (48 <= reg && reg <= 63));
-}
-
-
-/* Return true if REG is an argument register, false otherwise. */
-static int
-is_argument_reg (int reg)
-{
- return (8 <= reg && reg <= 13);
-}
-
-
-/* Scan an FR-V prologue, starting at PC, until frame->PC.
- If FRAME is non-zero, fill in its saved_regs with appropriate addresses.
- We assume FRAME's saved_regs array has already been allocated and cleared.
- Return the first PC value after the prologue.
-
- Note that, for unoptimized code, we almost don't need this function
- at all; all arguments and locals live on the stack, so we just need
- the FP to find everything. The catch: structures passed by value
- have their addresses living in registers; they're never spilled to
- the stack. So if you ever want to be able to get to these
- arguments in any frame but the top, you'll need to do this serious
- prologue analysis. */
-static CORE_ADDR
-frv_analyze_prologue (CORE_ADDR pc, struct frame_info *frame)
-{
- /* When writing out instruction bitpatterns, we use the following
- letters to label instruction fields:
- P - The parallel bit. We don't use this.
- J - The register number of GRj in the instruction description.
- K - The register number of GRk in the instruction description.
- I - The register number of GRi.
- S - a signed imediate offset.
- U - an unsigned immediate offset.
-
- The dots below the numbers indicate where hex digit boundaries
- fall, to make it easier to check the numbers. */
-
- /* Non-zero iff we've seen the instruction that initializes the
- frame pointer for this function's frame. */
- int fp_set = 0;
-
- /* If fp_set is non_zero, then this is the distance from
- the stack pointer to frame pointer: fp = sp + fp_offset. */
- int fp_offset = 0;
-
- /* Total size of frame prior to any alloca operations. */
- int framesize = 0;
-
- /* The number of the general-purpose register we saved the return
- address ("link register") in, or -1 if we haven't moved it yet. */
- int lr_save_reg = -1;
-
- /* Non-zero iff we've saved the LR onto the stack. */
- int lr_saved_on_stack = 0;
-
- /* If gr_saved[i] is non-zero, then we've noticed that general
- register i has been saved at gr_sp_offset[i] from the stack
- pointer. */
- char gr_saved[64];
- int gr_sp_offset[64];
-
- memset (gr_saved, 0, sizeof (gr_saved));
-
- while (! frame || pc < frame->pc)
- {
- LONGEST op = read_memory_integer (pc, 4);
-
- /* The tests in this chain of ifs should be in order of
- decreasing selectivity, so that more particular patterns get
- to fire before less particular patterns. */
-
- /* Setting the FP from the SP:
- ori sp, 0, fp
- P 000010 0100010 000001 000000000000 = 0x04881000
- 0 111111 1111111 111111 111111111111 = 0x7fffffff
- . . . . . . . .
- We treat this as part of the prologue. */
- if ((op & 0x7fffffff) == 0x04881000)
- {
- fp_set = 1;
- fp_offset = 0;
- }
-
- /* Move the link register to the scratch register grJ, before saving:
- movsg lr, grJ
- P 000100 0000011 010000 000111 JJJJJJ = 0x080d01c0
- 0 111111 1111111 111111 111111 000000 = 0x7fffffc0
- . . . . . . . .
- We treat this as part of the prologue. */
- else if ((op & 0x7fffffc0) == 0x080d01c0)
- {
- int gr_j = op & 0x3f;
-
- /* If we're moving it to a scratch register, that's fine. */
- if (is_caller_saves_reg (gr_j))
- lr_save_reg = gr_j;
- /* Otherwise it's not a prologue instruction that we
- recognize. */
- else
- break;
- }
-
- /* To save multiple callee-saves registers on the stack, at
- offset zero:
-
- std grK,@(sp,gr0)
- P KKKKKK 0000011 000001 000011 000000 = 0x000c10c0
- 0 000000 1111111 111111 111111 111111 = 0x01ffffff
-
- stq grK,@(sp,gr0)
- P KKKKKK 0000011 000001 000100 000000 = 0x000c1100
- 0 000000 1111111 111111 111111 111111 = 0x01ffffff
- . . . . . . . .
- We treat this as part of the prologue, and record the register's
- saved address in the frame structure. */
- else if ((op & 0x01ffffff) == 0x000c10c0
- || (op & 0x01ffffff) == 0x000c1100)
- {
- int gr_k = ((op >> 25) & 0x3f);
- int ope = ((op >> 6) & 0x3f);
- int count;
- int i;
-
- /* Is it an std or an stq? */
- if (ope == 0x03)
- count = 2;
- else
- count = 4;
-
- /* Is it really a callee-saves register? */
- if (is_callee_saves_reg (gr_k))
- {
- for (i = 0; i < count; i++)
- {
- gr_saved[gr_k + i] = 1;
- gr_sp_offset[gr_k + i] = 4 * i;
- }
- }
- else
- /* It's not a prologue instruction. */
- break;
- }
-
- /* Adjusting the stack pointer. (The stack pointer is GR1.)
- addi sp, S, sp
- P 000001 0010000 000001 SSSSSSSSSSSS = 0x02401000
- 0 111111 1111111 111111 000000000000 = 0x7ffff000
- . . . . . . . .
- We treat this as part of the prologue. */
- else if ((op & 0x7ffff000) == 0x02401000)
- {
- /* Sign-extend the twelve-bit field.
- (Isn't there a better way to do this?) */
- int s = (((op & 0xfff) - 0x800) & 0xfff) - 0x800;
-
- framesize -= s;
- }
-
- /* Setting the FP to a constant distance from the SP:
- addi sp, S, fp
- P 000010 0010000 000001 SSSSSSSSSSSS = 0x04401000
- 0 111111 1111111 111111 000000000000 = 0x7ffff000
- . . . . . . . .
- We treat this as part of the prologue. */
- else if ((op & 0x7ffff000) == 0x04401000)
- {
- /* Sign-extend the twelve-bit field.
- (Isn't there a better way to do this?) */
- int s = (((op & 0xfff) - 0x800) & 0xfff) - 0x800;
- fp_set = 1;
- fp_offset = s;
- }
-
- /* To spill an argument register to a scratch register:
- ori GRi, 0, GRk
- P KKKKKK 0100010 IIIIII 000000000000 = 0x00880000
- 0 000000 1111111 000000 111111111111 = 0x01fc0fff
- . . . . . . . .
- For the time being, we treat this as a prologue instruction,
- assuming that GRi is an argument register. This one's kind
- of suspicious, because it seems like it could be part of a
- legitimate body instruction. But we only come here when the
- source info wasn't helpful, so we have to do the best we can.
- Hopefully once GCC and GDB agree on how to emit line number
- info for prologues, then this code will never come into play. */
- else if ((op & 0x01fc0fff) == 0x00880000)
- {
- int gr_i = ((op >> 12) & 0x3f);
-
- /* If the source isn't an arg register, then this isn't a
- prologue instruction. */
- if (! is_argument_reg (gr_i))
- break;
- }
-
- /* To spill 16-bit values to the stack:
- sthi GRk, @(fp, s)
- P KKKKKK 1010001 000010 SSSSSSSSSSSS = 0x01442000
- 0 000000 1111111 111111 000000000000 = 0x01fff000
- . . . . . . . .
- And for 8-bit values, we use STB instructions.
- stbi GRk, @(fp, s)
- P KKKKKK 1010000 000010 SSSSSSSSSSSS = 0x01402000
- 0 000000 1111111 111111 000000000000 = 0x01fff000
- . . . . . . . .
- We check that GRk is really an argument register, and treat
- all such as part of the prologue. */
- else if ( (op & 0x01fff000) == 0x01442000
- || (op & 0x01fff000) == 0x01402000)
- {
- int gr_k = ((op >> 25) & 0x3f);
-
- if (! is_argument_reg (gr_k))
- break; /* Source isn't an arg register. */
- }
-
- /* To save multiple callee-saves register on the stack, at a
- non-zero offset:
-
- stdi GRk, @(sp, s)
- P KKKKKK 1010011 000001 SSSSSSSSSSSS = 0x014c1000
- 0 000000 1111111 111111 000000000000 = 0x01fff000
- . . . . . . . .
- stqi GRk, @(sp, s)
- P KKKKKK 1010100 000001 SSSSSSSSSSSS = 0x01501000
- 0 000000 1111111 111111 000000000000 = 0x01fff000
- . . . . . . . .
- We treat this as part of the prologue, and record the register's
- saved address in the frame structure. */
- else if ((op & 0x01fff000) == 0x014c1000
- || (op & 0x01fff000) == 0x01501000)
- {
- int gr_k = ((op >> 25) & 0x3f);
- int count;
- int i;
-
- /* Is it a stdi or a stqi? */
- if ((op & 0x01fff000) == 0x014c1000)
- count = 2;
- else
- count = 4;
-
- /* Is it really a callee-saves register? */
- if (is_callee_saves_reg (gr_k))
- {
- /* Sign-extend the twelve-bit field.
- (Isn't there a better way to do this?) */
- int s = (((op & 0xfff) - 0x800) & 0xfff) - 0x800;
-
- for (i = 0; i < count; i++)
- {
- gr_saved[gr_k + i] = 1;
- gr_sp_offset[gr_k + i] = s + (4 * i);
- }
- }
- else
- /* It's not a prologue instruction. */
- break;
- }
-
- /* Storing any kind of integer register at any constant offset
- from any other register.
-
- st GRk, @(GRi, gr0)
- P KKKKKK 0000011 IIIIII 000010 000000 = 0x000c0080
- 0 000000 1111111 000000 111111 111111 = 0x01fc0fff
- . . . . . . . .
- sti GRk, @(GRi, d12)
- P KKKKKK 1010010 IIIIII SSSSSSSSSSSS = 0x01480000
- 0 000000 1111111 000000 000000000000 = 0x01fc0000
- . . . . . . . .
- These could be almost anything, but a lot of prologue
- instructions fall into this pattern, so let's decode the
- instruction once, and then work at a higher level. */
- else if (((op & 0x01fc0fff) == 0x000c0080)
- || ((op & 0x01fc0000) == 0x01480000))
- {
- int gr_k = ((op >> 25) & 0x3f);
- int gr_i = ((op >> 12) & 0x3f);
- int offset;
-
- /* Are we storing with gr0 as an offset, or using an
- immediate value? */
- if ((op & 0x01fc0fff) == 0x000c0080)
- offset = 0;
- else
- offset = (((op & 0xfff) - 0x800) & 0xfff) - 0x800;
-
- /* If the address isn't relative to the SP or FP, it's not a
- prologue instruction. */
- if (gr_i != sp_regnum && gr_i != fp_regnum)
- break;
-
- /* Saving the old FP in the new frame (relative to the SP). */
- if (gr_k == fp_regnum && gr_i == sp_regnum)
- ;
-
- /* Saving callee-saves register(s) on the stack, relative to
- the SP. */
- else if (gr_i == sp_regnum
- && is_callee_saves_reg (gr_k))
- {
- gr_saved[gr_k] = 1;
- gr_sp_offset[gr_k] = offset;
- }
-
- /* Saving the scratch register holding the return address. */
- else if (lr_save_reg != -1
- && gr_k == lr_save_reg)
- lr_saved_on_stack = 1;
-
- /* Spilling int-sized arguments to the stack. */
- else if (is_argument_reg (gr_k))
- ;
-
- /* It's not a store instruction we recognize, so this must
- be the end of the prologue. */
- else
- break;
- }
-
- /* It's not any instruction we recognize, so this must be the end
- of the prologue. */
- else
- break;
-
- pc += 4;
- }
-
- if (frame)
- {
- frame->extra_info->lr_saved_on_stack = lr_saved_on_stack;
-
- /* If we know the relationship between the stack and frame
- pointers, record the addresses of the registers we noticed.
- Note that we have to do this as a separate step at the end,
- because instructions may save relative to the SP, but we need
- their addresses relative to the FP. */
- if (fp_set)
- {
- int i;
-
- for (i = 0; i < 64; i++)
- if (gr_saved[i])
- frame->saved_regs[i] = (frame->frame
- - fp_offset + gr_sp_offset[i]);
-
- frame->extra_info->fp_to_callers_sp_offset = framesize - fp_offset;
- }
- }
-
- return pc;
-}
-
-
-static CORE_ADDR
-frv_skip_prologue (CORE_ADDR pc)
-{
- CORE_ADDR func_addr, func_end, new_pc;
-
- new_pc = pc;
-
- /* If the line table has entry for a line *within* the function
- (i.e., not in the prologue, and not past the end), then that's
- our location. */
- if (find_pc_partial_function (pc, NULL, &func_addr, &func_end))
- {
- struct symtab_and_line sal;
-
- sal = find_pc_line (func_addr, 0);
-
- if (sal.line != 0 && sal.end < func_end)
- {
- new_pc = sal.end;
- }
- }
-
- /* The FR-V prologue is at least five instructions long (twenty bytes).
- If we didn't find a real source location past that, then
- do a full analysis of the prologue. */
- if (new_pc < pc + 20)
- new_pc = frv_analyze_prologue (pc, 0);
-
- return new_pc;
-}
-
-static void
-frv_frame_init_saved_regs (struct frame_info *frame)
-{
- if (frame->saved_regs)
- return;
-
- frame_saved_regs_zalloc (frame);
- frame->saved_regs[fp_regnum] = frame->frame;
-
- /* Find the beginning of this function, so we can analyze its
- prologue. */
- {
- CORE_ADDR func_addr, func_end;
-
- if (find_pc_partial_function (frame->pc, NULL, &func_addr, &func_end))
- frv_analyze_prologue (func_addr, frame);
- }
-}
-
-/* Should we use EXTRACT_STRUCT_VALUE_ADDRESS instead of
- EXTRACT_RETURN_VALUE? GCC_P is true if compiled with gcc
- and TYPE is the type (which is known to be struct, union or array).
-
- The frv returns all structs in memory. */
-
-static int
-frv_use_struct_convention (int gcc_p, struct type *type)
-{
- return 1;
-}
-
-static void
-frv_extract_return_value (struct type *type, char *regbuf, char *valbuf)
-{
- memcpy (valbuf, (regbuf
- + frv_register_byte (8)
- + (TYPE_LENGTH (type) < 4 ? 4 - TYPE_LENGTH (type) : 0)),
- TYPE_LENGTH (type));
-}
-
-static CORE_ADDR
-frv_extract_struct_value_address (char *regbuf)
-{
- return extract_address (regbuf + frv_register_byte (struct_return_regnum),
- 4);
-}
-
-static void
-frv_store_struct_return (CORE_ADDR addr, CORE_ADDR sp)
-{
- write_register (struct_return_regnum, addr);
-}
-
-static int
-frv_frameless_function_invocation (struct frame_info *frame)
-{
- return frameless_look_for_prologue (frame);
-}
-
-static CORE_ADDR
-frv_saved_pc_after_call (struct frame_info *frame)
-{
- return read_register (lr_regnum);
-}
-
-static void
-frv_init_extra_frame_info (int fromleaf, struct frame_info *frame)
-{
- frame->extra_info = (struct frame_extra_info *)
- frame_obstack_alloc (sizeof (struct frame_extra_info));
- frame->extra_info->fp_to_callers_sp_offset = 0;
- frame->extra_info->lr_saved_on_stack = 0;
-}
-
-#define ROUND_UP(n,a) (((n)+(a)-1) & ~((a)-1))
-#define ROUND_DOWN(n,a) ((n) & ~((a)-1))
-
-static CORE_ADDR
-frv_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
- int struct_return, CORE_ADDR struct_addr)
-{
- int argreg;
- int argnum;
- char *val;
- char valbuf[4];
- struct value *arg;
- struct type *arg_type;
- int len;
- enum type_code typecode;
- CORE_ADDR regval;
- int stack_space;
- int stack_offset;
-
-#if 0
- printf("Push %d args at sp = %x, struct_return=%d (%x)\n",
- nargs, (int) sp, struct_return, struct_addr);
-#endif
-
- stack_space = 0;
- for (argnum = 0; argnum < nargs; ++argnum)
- stack_space += ROUND_UP (TYPE_LENGTH (VALUE_TYPE (args[argnum])), 4);
-
- stack_space -= (6 * 4);
- if (stack_space > 0)
- sp -= stack_space;
-
- /* Make sure stack is dword aligned. */
- sp = ROUND_DOWN (sp, 8);
-
- stack_offset = 0;
-
- argreg = 8;
-
- if (struct_return)
- write_register (struct_return_regnum, struct_addr);
-
- for (argnum = 0; argnum < nargs; ++argnum)
- {
- arg = args[argnum];
- arg_type = check_typedef (VALUE_TYPE (arg));
- len = TYPE_LENGTH (arg_type);
- typecode = TYPE_CODE (arg_type);
-
- if (typecode == TYPE_CODE_STRUCT || typecode == TYPE_CODE_UNION)
- {
- store_address (valbuf, 4, VALUE_ADDRESS (arg));
- typecode = TYPE_CODE_PTR;
- len = 4;
- val = valbuf;
- }
- else
- {
- val = (char *) VALUE_CONTENTS (arg);
- }
-
- while (len > 0)
- {
- int partial_len = (len < 4 ? len : 4);
-
- if (argreg < 14)
- {
- regval = extract_address (val, partial_len);
-#if 0
- printf(" Argnum %d data %x -> reg %d\n",
- argnum, (int) regval, argreg);
-#endif
- write_register (argreg, regval);
- ++argreg;
- }
- else
- {
-#if 0
- printf(" Argnum %d data %x -> offset %d (%x)\n",
- argnum, *((int *)val), stack_offset, (int) (sp + stack_offset));
-#endif
- write_memory (sp + stack_offset, val, partial_len);
- stack_offset += ROUND_UP(partial_len, 4);
- }
- len -= partial_len;
- val += partial_len;
- }
- }
- return sp;
-}
-
-static CORE_ADDR
-frv_push_return_address (CORE_ADDR pc, CORE_ADDR sp)
-{
- write_register (lr_regnum, CALL_DUMMY_ADDRESS ());
- return sp;
-}
-
-static void
-frv_store_return_value (struct type *type, char *valbuf)
-{
- int length = TYPE_LENGTH (type);
- int reg8_offset = frv_register_byte (8);
-
- if (length <= 4)
- write_register_bytes (reg8_offset + (4 - length), valbuf, length);
- else if (length == 8)
- write_register_bytes (reg8_offset, valbuf, length);
- else
- internal_error (__FILE__, __LINE__,
- "Don't know how to return a %d-byte value.", length);
-}
-
-static void
-frv_pop_frame (void)
-{
- generic_pop_current_frame (frv_pop_frame_regular);
-}
-
-static void
-frv_pop_frame_regular (struct frame_info *frame)
-{
- CORE_ADDR fp;
- int regno;
-
- fp = frame->frame;
-
- frv_frame_init_saved_regs (frame);
-
- write_register (pc_regnum, frv_frame_saved_pc (frame));
- for (regno = 0; regno < frv_num_regs; ++regno)
- {
- if (frame->saved_regs[regno]
- && regno != pc_regnum
- && regno != sp_regnum)
- {
- write_register (regno,
- read_memory_integer (frame->saved_regs[regno], 4));
- }
- }
- write_register (sp_regnum, fp + frame->extra_info->fp_to_callers_sp_offset);
- flush_cached_frames ();
-}
-
-
-static void
-frv_remote_translate_xfer_address (CORE_ADDR memaddr, int nr_bytes,
- CORE_ADDR *targ_addr, int *targ_len)
-{
- *targ_addr = memaddr;
- *targ_len = nr_bytes;
-}
-
-
-/* Hardware watchpoint / breakpoint support for the FR500
- and FR400. */
-
-int
-frv_check_watch_resources (int type, int cnt, int ot)
-{
- struct gdbarch_tdep *var = CURRENT_VARIANT;
-
- /* Watchpoints not supported on simulator. */
- if (strcmp (target_shortname, "sim") == 0)
- return 0;
-
- if (type == bp_hardware_breakpoint)
- {
- if (var->num_hw_breakpoints == 0)
- return 0;
- else if (cnt <= var->num_hw_breakpoints)
- return 1;
- }
- else
- {
- if (var->num_hw_watchpoints == 0)
- return 0;
- else if (ot)
- return -1;
- else if (cnt <= var->num_hw_watchpoints)
- return 1;
- }
- return -1;
-}
-
-
-CORE_ADDR
-frv_stopped_data_address (void)
-{
- CORE_ADDR brr, dbar0, dbar1, dbar2, dbar3;
-
- brr = read_register (brr_regnum);
- dbar0 = read_register (dbar0_regnum);
- dbar1 = read_register (dbar1_regnum);
- dbar2 = read_register (dbar2_regnum);
- dbar3 = read_register (dbar3_regnum);
-
- if (brr & (1<<11))
- return dbar0;
- else if (brr & (1<<10))
- return dbar1;
- else if (brr & (1<<9))
- return dbar2;
- else if (brr & (1<<8))
- return dbar3;
- else
- return 0;
-}
-
-static struct gdbarch *
-frv_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
-{
- struct gdbarch *gdbarch;
- struct gdbarch_tdep *var;
-
- /* Check to see if we've already built an appropriate architecture
- object for this executable. */
- arches = gdbarch_list_lookup_by_info (arches, &info);
- if (arches)
- return arches->gdbarch;
-
- /* Select the right tdep structure for this variant. */
- var = new_variant ();
- switch (info.bfd_arch_info->mach)
- {
- case bfd_mach_frv:
- case bfd_mach_frvsimple:
- case bfd_mach_fr500:
- case bfd_mach_frvtomcat:
- set_variant_num_gprs (var, 64);
- set_variant_num_fprs (var, 64);
- break;
-
- case bfd_mach_fr400:
- set_variant_num_gprs (var, 32);
- set_variant_num_fprs (var, 32);
- break;
-
- default:
- /* Never heard of this variant. */
- return 0;
- }
-
- gdbarch = gdbarch_alloc (&info, var);
-
- 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_double_bit (gdbarch, 64);
- set_gdbarch_long_double_bit (gdbarch, 64);
- set_gdbarch_ptr_bit (gdbarch, 32);
-
- set_gdbarch_num_regs (gdbarch, frv_num_regs);
- set_gdbarch_sp_regnum (gdbarch, sp_regnum);
- set_gdbarch_fp_regnum (gdbarch, fp_regnum);
- set_gdbarch_pc_regnum (gdbarch, pc_regnum);
-
- set_gdbarch_register_name (gdbarch, frv_register_name);
- set_gdbarch_register_size (gdbarch, 4);
- set_gdbarch_register_bytes (gdbarch, frv_num_regs * 4);
- set_gdbarch_register_byte (gdbarch, frv_register_byte);
- set_gdbarch_register_raw_size (gdbarch, frv_register_raw_size);
- set_gdbarch_max_register_raw_size (gdbarch, 4);
- set_gdbarch_register_virtual_size (gdbarch, frv_register_virtual_size);
- set_gdbarch_max_register_virtual_size (gdbarch, 4);
- set_gdbarch_register_virtual_type (gdbarch, frv_register_virtual_type);
-
- set_gdbarch_skip_prologue (gdbarch, frv_skip_prologue);
- set_gdbarch_breakpoint_from_pc (gdbarch, frv_breakpoint_from_pc);
-
- set_gdbarch_frame_num_args (gdbarch, frame_num_args_unknown);
- set_gdbarch_frame_args_skip (gdbarch, 0);
- set_gdbarch_frameless_function_invocation (gdbarch, frv_frameless_function_invocation);
-
- set_gdbarch_saved_pc_after_call (gdbarch, frv_saved_pc_after_call);
-
- set_gdbarch_frame_chain (gdbarch, frv_frame_chain);
- set_gdbarch_frame_chain_valid (gdbarch, func_frame_chain_valid);
- set_gdbarch_frame_saved_pc (gdbarch, frv_frame_saved_pc);
- set_gdbarch_frame_args_address (gdbarch, default_frame_address);
- set_gdbarch_frame_locals_address (gdbarch, default_frame_address);
-
- set_gdbarch_frame_init_saved_regs (gdbarch, frv_frame_init_saved_regs);
-
- set_gdbarch_use_struct_convention (gdbarch, frv_use_struct_convention);
- set_gdbarch_deprecated_extract_return_value (gdbarch, frv_extract_return_value);
-
- set_gdbarch_store_struct_return (gdbarch, frv_store_struct_return);
- set_gdbarch_deprecated_store_return_value (gdbarch, frv_store_return_value);
- set_gdbarch_deprecated_extract_struct_value_address (gdbarch, frv_extract_struct_value_address);
-
- /* Settings for calling functions in the inferior. */
- set_gdbarch_use_generic_dummy_frames (gdbarch, 1);
- set_gdbarch_call_dummy_length (gdbarch, 0);
- set_gdbarch_coerce_float_to_double (gdbarch,
- standard_coerce_float_to_double);
- set_gdbarch_push_arguments (gdbarch, frv_push_arguments);
- set_gdbarch_push_return_address (gdbarch, frv_push_return_address);
- set_gdbarch_pop_frame (gdbarch, frv_pop_frame);
-
- set_gdbarch_call_dummy_p (gdbarch, 1);
- set_gdbarch_call_dummy_words (gdbarch, frv_call_dummy_words);
- set_gdbarch_sizeof_call_dummy_words (gdbarch, sizeof (frv_call_dummy_words));
- set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch, 1);
- set_gdbarch_init_extra_frame_info (gdbarch, frv_init_extra_frame_info);
-
- /* Settings that should be unnecessary. */
- set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
-
- set_gdbarch_read_pc (gdbarch, generic_target_read_pc);
- set_gdbarch_write_pc (gdbarch, generic_target_write_pc);
- set_gdbarch_read_fp (gdbarch, generic_target_read_fp);
- set_gdbarch_read_sp (gdbarch, generic_target_read_sp);
- set_gdbarch_write_sp (gdbarch, generic_target_write_sp);
-
- set_gdbarch_call_dummy_location (gdbarch, AT_ENTRY_POINT);
- set_gdbarch_call_dummy_address (gdbarch, entry_point_address);
- set_gdbarch_call_dummy_breakpoint_offset (gdbarch, 0);
- set_gdbarch_call_dummy_start_offset (gdbarch, 0);
- set_gdbarch_pc_in_call_dummy (gdbarch, pc_in_call_dummy_at_entry_point);
- set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0);
- set_gdbarch_push_dummy_frame (gdbarch, generic_push_dummy_frame);
- set_gdbarch_fix_call_dummy (gdbarch, generic_fix_call_dummy);
-
- set_gdbarch_get_saved_register (gdbarch, generic_unwind_get_saved_register);
-
- set_gdbarch_decr_pc_after_break (gdbarch, 0);
- set_gdbarch_function_start_offset (gdbarch, 0);
- set_gdbarch_register_convertible (gdbarch, generic_register_convertible_not);
-
- set_gdbarch_remote_translate_xfer_address
- (gdbarch, frv_remote_translate_xfer_address);
-
- /* Hardware watchpoint / breakpoint support. */
- switch (info.bfd_arch_info->mach)
- {
- case bfd_mach_frv:
- case bfd_mach_frvsimple:
- case bfd_mach_fr500:
- case bfd_mach_frvtomcat:
- /* fr500-style hardware debugging support. */
- var->num_hw_watchpoints = 4;
- var->num_hw_breakpoints = 4;
- break;
-
- case bfd_mach_fr400:
- /* fr400-style hardware debugging support. */
- var->num_hw_watchpoints = 2;
- var->num_hw_breakpoints = 4;
- break;
-
- default:
- /* Otherwise, assume we don't have hardware debugging support. */
- var->num_hw_watchpoints = 0;
- var->num_hw_breakpoints = 0;
- break;
- }
-
- return gdbarch;
-}
-
-void
-_initialize_frv_tdep (void)
-{
- register_gdbarch_init (bfd_arch_frv, frv_gdbarch_init);
-
- tm_print_insn = print_insn_frv;
-}
-
-