-/* Target-dependent code for the NEC V850 for GDB, the GNU debugger.
- Copyright 1996, Free Software Foundation, Inc.
+/* Target-dependent code for the Fujitsu FR30.
+ Copyright 1999, 2001 Free Software Foundation, Inc.
-This file is part of GDB.
+ 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 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.
+ 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. */
+ 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 "frame.h"
#include "gdb_string.h"
#include "gdbcore.h"
#include "symfile.h"
+#include "regcache.h"
-niy(char *f, int l)
+/* An expression that tells us whether the function invocation represented
+ by FI does not have a frame on the stack associated with it. */
+int
+fr30_frameless_function_invocation (struct frame_info *fi)
{
- fprintf(stderr, "%s(%d): Not implemented yet\n", f, l);
+ int frameless;
+ CORE_ADDR func_start, after_prologue;
+ func_start = (get_pc_function_start ((fi)->pc) +
+ FUNCTION_START_OFFSET);
+ after_prologue = func_start;
+ after_prologue = SKIP_PROLOGUE (after_prologue);
+ frameless = (after_prologue == func_start);
+ return frameless;
}
-#define NIY() niy(__FILE__, __LINE__)
+
+/* Function: pop_frame
+ This routine gets called when either the user uses the `return'
+ command, or the call dummy breakpoint gets hit. */
void
-fr30_pop_frame()
+fr30_pop_frame (void)
{
- NIY();
-}
+ struct frame_info *frame = get_current_frame ();
+ int regnum;
+ CORE_ADDR sp = read_register (SP_REGNUM);
-CORE_ADDR
-fr30_frame_chain(struct frame_info *fi)
-{
- NIY();
+ if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame))
+ generic_pop_dummy_frame ();
+ else
+ {
+ write_register (PC_REGNUM, FRAME_SAVED_PC (frame));
+
+ for (regnum = 0; regnum < NUM_REGS; regnum++)
+ if (frame->fsr.regs[regnum] != 0)
+ {
+ write_register (regnum,
+ read_memory_unsigned_integer (frame->fsr.regs[regnum],
+ REGISTER_RAW_SIZE (regnum)));
+ }
+ write_register (SP_REGNUM, sp + frame->framesize);
+ }
+ flush_cached_frames ();
}
-CORE_ADDR
-fr30_frame_saved_pc(struct frame_info *fi)
+
+/* Function: fr30_store_return_value
+ Put a value where a caller expects to see it. Used by the 'return'
+ command. */
+void
+fr30_store_return_value (struct type *type,
+ char *valbuf)
{
- NIY();
+ /* Here's how the FR30 returns values (gleaned from gcc/config/
+ fr30/fr30.h):
+
+ If the return value is 32 bits long or less, it goes in r4.
+
+ If the return value is 64 bits long or less, it goes in r4 (most
+ significant word) and r5 (least significant word.
+
+ If the function returns a structure, of any size, the caller
+ passes the function an invisible first argument where the callee
+ should store the value. But GDB doesn't let you do that anyway.
+
+ If you're returning a value smaller than a word, it's not really
+ necessary to zero the upper bytes of the register; the caller is
+ supposed to ignore them. However, the FR30 typically keeps its
+ values extended to the full register width, so we should emulate
+ that. */
+
+ /* The FR30 is big-endian, so if we return a small value (like a
+ short or a char), we need to position it correctly within the
+ register. We round the size up to a register boundary, and then
+ adjust the offset so as to place the value at the right end. */
+ int value_size = TYPE_LENGTH (type);
+ int returned_size = (value_size + FR30_REGSIZE - 1) & ~(FR30_REGSIZE - 1);
+ int offset = (REGISTER_BYTE (RETVAL_REG)
+ + (returned_size - value_size));
+ char *zeros = alloca (returned_size);
+ memset (zeros, 0, returned_size);
+
+ write_register_bytes (REGISTER_BYTE (RETVAL_REG), zeros, returned_size);
+ write_register_bytes (offset, valbuf, value_size);
}
+
+/* Function: skip_prologue
+ Return the address of the first code past the prologue of the function. */
+
CORE_ADDR
-fr30_skip_prologue(CORE_ADDR pc)
+fr30_skip_prologue (CORE_ADDR pc)
{
- NIY();
+ CORE_ADDR func_addr, func_end;
+
+ /* See what the symbol table says */
+
+ 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)
+ {
+ return sal.end;
+ }
+ }
+
+/* Either we didn't find the start of this function (nothing we can do),
+ or there's no line info, or the line after the prologue is after
+ the end of the function (there probably isn't a prologue). */
+
+ return pc;
}
+/* Function: push_arguments
+ Setup arguments and RP for a call to the target. First four args
+ go in FIRST_ARGREG -> LAST_ARGREG, subsequent args go on stack...
+ Structs are passed by reference. XXX not right now Z.R.
+ 64 bit quantities (doubles and long longs) may be split between
+ the regs and the stack.
+ When calling a function that returns a struct, a pointer to the struct
+ is passed in as a secret first argument (always in FIRST_ARGREG).
+
+ Stack space for the args has NOT been allocated: that job is up to us.
+ */
+
CORE_ADDR
-fr30_push_arguments(nargs, args, sp, struct_return, struct_addr)
- int nargs;
- value_ptr * args;
- CORE_ADDR sp;
- int struct_return;
- CORE_ADDR struct_addr;
+fr30_push_arguments (int nargs, value_ptr *args, CORE_ADDR sp,
+ int struct_return, CORE_ADDR struct_addr)
{
int argreg;
int argnum;
int stack_offset;
- struct stack_arg {
+ struct stack_arg
+ {
char *val;
int len;
int offset;
};
struct stack_arg *stack_args =
- (struct stack_arg*)alloca (nargs * sizeof (struct stack_arg));
+ (struct stack_arg *) alloca (nargs * sizeof (struct stack_arg));
int nstack_args = 0;
-
- /* Initialize the integer and float register pointers. */
argreg = FIRST_ARGREG;
/* the struct_return pointer occupies the first parameter-passing reg */
if (struct_return)
- write_register (argreg++, struct_addr);
-
-#if(0)
- /* The offset onto the stack at which we will start copying parameters
- (after the registers are used up) begins at 16 in the old ABI.
- This leaves room for the "home" area for register parameters. */
- stack_offset = REGISTER_SIZE * 4;
-#else
-/* XXX which ABI are we using ? Z.R. */
+ write_register (argreg++, struct_addr);
+
stack_offset = 0;
-#endif
/* Process args from left to right. Store as many as allowed in
- registers, save the rest to be pushed on the stack */
- for(argnum = 0; argnum < nargs; argnum++)
+ registers, save the rest to be pushed on the stack */
+ for (argnum = 0; argnum < nargs; argnum++)
{
- char * val;
- value_ptr arg = args[argnum];
- struct type * arg_type = check_typedef (VALUE_TYPE (arg));
- struct type * target_type = TYPE_TARGET_TYPE (arg_type);
- int len = TYPE_LENGTH (arg_type);
+ char *val;
+ value_ptr arg = args[argnum];
+ struct type *arg_type = check_typedef (VALUE_TYPE (arg));
+ struct type *target_type = TYPE_TARGET_TYPE (arg_type);
+ int len = TYPE_LENGTH (arg_type);
enum type_code typecode = TYPE_CODE (arg_type);
- CORE_ADDR regval;
+ CORE_ADDR regval;
int newarg;
val = (char *) VALUE_CONTENTS (arg);
- {
- /* Copy the argument to general registers or the stack in
- register-sized pieces. Large arguments are split between
- registers and stack. */
- while (len > 0)
- {
- if (argreg <= LAST_ARGREG)
- {
- int partial_len = len < REGISTER_SIZE ? len : REGISTER_SIZE;
- regval = extract_address (val, partial_len);
-
- /* It's a simple argument being passed in a general
- register. */
- write_register (argreg, regval);
- argreg++;
- len -= partial_len;
- val += partial_len;
- }
- else
- {
- /* keep for later pushing */
- stack_args[nstack_args].val = val;
- stack_args[nstack_args++].len = len;
- break;
- }
- }
- }
- }
- /* now do the real stack pushing, process args right to left */
- while(nstack_args--)
{
- sp -= stack_args[nstack_args].len;
- write_memory(sp, stack_args[nstack_args].val,
- stack_args[nstack_args].len);
+ /* Copy the argument to general registers or the stack in
+ register-sized pieces. Large arguments are split between
+ registers and stack. */
+ while (len > 0)
+ {
+ if (argreg <= LAST_ARGREG)
+ {
+ int partial_len = len < REGISTER_SIZE ? len : REGISTER_SIZE;
+ regval = extract_address (val, partial_len);
+
+ /* It's a simple argument being passed in a general
+ register. */
+ write_register (argreg, regval);
+ argreg++;
+ len -= partial_len;
+ val += partial_len;
+ }
+ else
+ {
+ /* keep for later pushing */
+ stack_args[nstack_args].val = val;
+ stack_args[nstack_args++].len = len;
+ break;
+ }
+ }
}
+ }
+ /* now do the real stack pushing, process args right to left */
+ while (nstack_args--)
+ {
+ sp -= stack_args[nstack_args].len;
+ write_memory (sp, stack_args[nstack_args].val,
+ stack_args[nstack_args].len);
+ }
/* Return adjusted stack pointer. */
return sp;
}
-_initialize_fr30_tdep()
-{
- extern int print_insn_fr30(bfd_vma, disassemble_info *);
+void _initialize_fr30_tdep (void);
- tm_print_insn = print_insn_fr30;
+void
+_initialize_fr30_tdep (void)
+{
+ extern int print_insn_fr30 (bfd_vma, disassemble_info *);
+ tm_print_insn = print_insn_fr30;
}
+/* Function: check_prologue_cache
+ Check if prologue for this frame's PC has already been scanned.
+ If it has, copy the relevant information about that prologue and
+ return non-zero. Otherwise do not copy anything and return zero.
-#if(0) /* Z.R. for now */
-/* Info gleaned from scanning a function's prologue. */
+ The information saved in the cache includes:
+ * the frame register number;
+ * the size of the stack frame;
+ * the offsets of saved regs (relative to the old SP); and
+ * the offset from the stack pointer to the frame pointer
-struct pifsr /* Info about one saved reg */
+ The cache contains only one entry, since this is adequate
+ for the typical sequence of prologue scan requests we get.
+ When performing a backtrace, GDB will usually ask to scan
+ the same function twice in a row (once to get the frame chain,
+ and once to fill in the extra frame information).
+ */
+
+static struct frame_info prologue_cache;
+
+static int
+check_prologue_cache (struct frame_info *fi)
{
- int framereg; /* Frame reg (SP or FP) */
- int offset; /* Offset from framereg */
- int cur_frameoffset; /* Current frameoffset */
- int reg; /* Saved register number */
-};
+ int i;
+
+ if (fi->pc == prologue_cache.pc)
+ {
+ fi->framereg = prologue_cache.framereg;
+ fi->framesize = prologue_cache.framesize;
+ fi->frameoffset = prologue_cache.frameoffset;
+ for (i = 0; i <= NUM_REGS; i++)
+ fi->fsr.regs[i] = prologue_cache.fsr.regs[i];
+ return 1;
+ }
+ else
+ return 0;
+}
-struct prologue_info
+
+/* Function: save_prologue_cache
+ Copy the prologue information from fi to the prologue cache.
+ */
+
+static void
+save_prologue_cache (struct frame_info *fi)
{
- int framereg;
- int frameoffset;
- int start_function;
- struct pifsr *pifsrs;
-};
-
-static CORE_ADDR xfr30_scan_prologue PARAMS ((CORE_ADDR pc,
- struct prologue_info *fs));
-\f
+ int i;
+
+ prologue_cache.pc = fi->pc;
+ prologue_cache.framereg = fi->framereg;
+ prologue_cache.framesize = fi->framesize;
+ prologue_cache.frameoffset = fi->frameoffset;
+
+ for (i = 0; i <= NUM_REGS; i++)
+ {
+ prologue_cache.fsr.regs[i] = fi->fsr.regs[i];
+ }
+}
+
+
/* Function: scan_prologue
Scan the prologue of the function that contains PC, and record what
we find in PI. PI->fsr must be zeroed by the called. Returns the
frame pointer yet. In some circumstances, the frame pointer can't
be determined till after we have scanned the prologue. */
-static CORE_ADDR
-xfr30_scan_prologue (pc, pi)
- CORE_ADDR pc;
- struct prologue_info *pi;
+static void
+fr30_scan_prologue (struct frame_info *fi)
{
- CORE_ADDR func_addr, prologue_end, current_pc;
- struct pifsr *pifsr, *pifsr_tmp;
- int fp_used;
- int ep_used;
- int reg;
- CORE_ADDR save_pc, save_end;
- int regsave_func_p;
- int current_sp_size;
- int r12_tmp;
+ int sp_offset, fp_offset;
+ CORE_ADDR prologue_start, prologue_end, current_pc;
- /* First, figure out the bounds of the prologue so that we can limit the
- search to something reasonable. */
-
- if (find_pc_partial_function (pc, NULL, &func_addr, NULL))
- {
- struct symtab_and_line sal;
+ /* Check if this function is already in the cache of frame information. */
+ if (check_prologue_cache (fi))
+ return;
- sal = find_pc_line (func_addr, 0);
+ /* Assume there is no frame until proven otherwise. */
+ fi->framereg = SP_REGNUM;
+ fi->framesize = 0;
+ fi->frameoffset = 0;
- if (func_addr == entry_point_address ())
- pi->start_function = 1;
- else
- pi->start_function = 0;
-
-#if 0
- if (sal.line == 0)
- prologue_end = pc;
- else
- prologue_end = sal.end;
-#else
- prologue_end = pc;
-#endif
+ /* Find the function prologue. If we can't find the function in
+ the symbol table, peek in the stack frame to find the PC. */
+ if (find_pc_partial_function (fi->pc, NULL, &prologue_start, &prologue_end))
+ {
+ /* Assume the prologue is everything between the first instruction
+ in the function and the first source line. */
+ struct symtab_and_line sal = find_pc_line (prologue_start, 0);
+
+ if (sal.line == 0) /* no line info, use current PC */
+ prologue_end = fi->pc;
+ else if (sal.end < prologue_end) /* next line begins after fn end */
+ prologue_end = sal.end; /* (probably means no prologue) */
}
else
- { /* We're in the boondocks */
- func_addr = pc - 100;
- prologue_end = pc;
+ {
+ /* XXX Z.R. What now??? The following is entirely bogus */
+ prologue_start = (read_memory_integer (fi->frame, 4) & 0x03fffffc) - 12;
+ prologue_end = prologue_start + 40;
}
- prologue_end = min (prologue_end, pc);
-
- /* Now, search the prologue looking for instructions that setup fp, save
- rp, adjust sp and such. We also record the frame offset of any saved
- registers. */
+ /* Now search the prologue looking for instructions that set up the
+ frame pointer, adjust the stack pointer, and save registers. */
- pi->frameoffset = 0;
- pi->framereg = SP_REGNUM;
- fp_used = 0;
- ep_used = 0;
- pifsr = pi->pifsrs;
- regsave_func_p = 0;
- save_pc = 0;
- save_end = 0;
- r12_tmp = 0;
+ sp_offset = fp_offset = 0;
+ for (current_pc = prologue_start; current_pc < prologue_end; current_pc += 2)
+ {
+ unsigned int insn;
-#ifdef DEBUG
- printf_filtered ("Current_pc = 0x%.8lx, prologue_end = 0x%.8lx\n",
- (long)func_addr, (long)prologue_end);
-#endif
+ insn = read_memory_unsigned_integer (current_pc, 2);
- for (current_pc = func_addr; current_pc < prologue_end; current_pc += 2)
- {
- int insn;
+ if ((insn & 0xfe00) == 0x8e00) /* stm0 or stm1 */
+ {
+ int reg, mask = insn & 0xff;
-#ifdef DEBUG
- printf_filtered ("0x%.8lx ", (long)current_pc);
- (*tm_print_insn) (current_pc, &tm_print_insn_info);
-#endif
+ /* scan in one sweep - create virtual 16-bit mask from either insn's mask */
+ if ((insn & 0x0100) == 0)
+ {
+ mask <<= 8; /* stm0 - move to upper byte in virtual mask */
+ }
- insn = read_memory_unsigned_integer (current_pc, 2);
+ /* Calculate offsets of saved registers (to be turned later into addresses). */
+ for (reg = R4_REGNUM; reg <= R11_REGNUM; reg++)
+ if (mask & (1 << (15 - reg)))
+ {
+ sp_offset -= 4;
+ fi->fsr.regs[reg] = sp_offset;
+ }
+ }
+ else if ((insn & 0xfff0) == 0x1700) /* st rx,@-r15 */
+ {
+ int reg = insn & 0xf;
- if ((insn & 0xffc0) == ((10 << 11) | 0x0780) && !regsave_func_p)
- { /* jarl <func>,10 */
- long low_disp = read_memory_unsigned_integer (current_pc + 2, 2) & ~ (long) 1;
- long disp = (((((insn & 0x3f) << 16) + low_disp)
- & ~ (long) 1) ^ 0x00200000) - 0x00200000;
-
- save_pc = current_pc;
- save_end = prologue_end;
- regsave_func_p = 1;
- current_pc += disp - 2;
- prologue_end = (current_pc
- + (2 * 3) /* moves to/from ep */
- + 4 /* addi <const>,sp,sp */
- + 2 /* jmp [r10] */
- + (2 * 12) /* sst.w to save r2, r20-r29, r31 */
- + 20); /* slop area */
-
-#ifdef DEBUG
- printf_filtered ("\tfound jarl <func>,r10, disp = %ld, low_disp = %ld, new pc = 0x%.8lx\n",
- disp, low_disp, (long)current_pc + 2);
-#endif
- continue;
+ sp_offset -= 4;
+ fi->fsr.regs[reg] = sp_offset;
}
- else if ((insn & 0xffe0) == 0x0060 && regsave_func_p)
- { /* jmp after processing register save function */
- current_pc = save_pc + 2;
- prologue_end = save_end;
- regsave_func_p = 0;
-#ifdef DEBUG
- printf_filtered ("\tfound jmp after regsave func");
-#endif
+ else if ((insn & 0xff00) == 0x0f00) /* enter */
+ {
+ fp_offset = fi->fsr.regs[FP_REGNUM] = sp_offset - 4;
+ sp_offset -= 4 * (insn & 0xff);
+ fi->framereg = FP_REGNUM;
}
- else if ((insn & 0x07c0) == 0x0780 /* jarl or jr */
- || (insn & 0xffe0) == 0x0060 /* jmp */
- || (insn & 0x0780) == 0x0580) /* branch */
+ else if (insn == 0x1781) /* st rp,@-sp */
{
-#ifdef DEBUG
- printf_filtered ("\n");
-#endif
- break; /* Ran into end of prologue */
+ sp_offset -= 4;
+ fi->fsr.regs[RP_REGNUM] = sp_offset;
}
-
- else if ((insn & 0xffe0) == ((SP_REGNUM << 11) | 0x0240)) /* add <imm>,sp */
- pi->frameoffset += ((insn & 0x1f) ^ 0x10) - 0x10;
- else if (insn == ((SP_REGNUM << 11) | 0x0600 | SP_REGNUM)) /* addi <imm>,sp,sp */
- pi->frameoffset += read_memory_integer (current_pc + 2, 2);
- else if (insn == ((FP_RAW_REGNUM << 11) | 0x0000 | SP_REGNUM)) /* mov sp,fp */
+ else if (insn == 0x170e) /* st fp,@-sp */
{
- fp_used = 1;
- pi->framereg = FP_RAW_REGNUM;
+ sp_offset -= 4;
+ fi->fsr.regs[FP_REGNUM] = sp_offset;
}
-
- else if (insn == ((R12_REGNUM << 11) | 0x0640 | R0_REGNUM)) /* movhi hi(const),r0,r12 */
- r12_tmp = read_memory_integer (current_pc + 2, 2) << 16;
- else if (insn == ((R12_REGNUM << 11) | 0x0620 | R12_REGNUM)) /* movea lo(const),r12,r12 */
- r12_tmp += read_memory_integer (current_pc + 2, 2);
- else if (insn == ((SP_REGNUM << 11) | 0x01c0 | R12_REGNUM) && r12_tmp) /* add r12,sp */
- pi->frameoffset = r12_tmp;
- else if (insn == ((EP_REGNUM << 11) | 0x0000 | SP_REGNUM)) /* mov sp,ep */
- ep_used = 1;
- else if (insn == ((EP_REGNUM << 11) | 0x0000 | R1_REGNUM)) /* mov r1,ep */
- ep_used = 0;
- else if (((insn & 0x07ff) == (0x0760 | SP_REGNUM) /* st.w <reg>,<offset>[sp] */
- || (fp_used
- && (insn & 0x07ff) == (0x0760 | FP_RAW_REGNUM))) /* st.w <reg>,<offset>[fp] */
- && pifsr
- && (((reg = (insn >> 11) & 0x1f) >= SAVE1_START_REGNUM && reg <= SAVE1_END_REGNUM)
- || (reg >= SAVE2_START_REGNUM && reg <= SAVE2_END_REGNUM)
- || (reg >= SAVE3_START_REGNUM && reg <= SAVE3_END_REGNUM)))
+ else if (insn == 0x8bfe) /* mov sp,fp */
{
- pifsr->reg = reg;
- pifsr->offset = read_memory_integer (current_pc + 2, 2) & ~1;
- pifsr->cur_frameoffset = pi->frameoffset;
-#ifdef DEBUG
- printf_filtered ("\tSaved register r%d, offset %d", reg, pifsr->offset);
-#endif
- pifsr++;
+ fi->framereg = FP_REGNUM;
}
-
- else if (ep_used /* sst.w <reg>,<offset>[ep] */
- && ((insn & 0x0781) == 0x0501)
- && pifsr
- && (((reg = (insn >> 11) & 0x1f) >= SAVE1_START_REGNUM && reg <= SAVE1_END_REGNUM)
- || (reg >= SAVE2_START_REGNUM && reg <= SAVE2_END_REGNUM)
- || (reg >= SAVE3_START_REGNUM && reg <= SAVE3_END_REGNUM)))
+ else if ((insn & 0xff00) == 0xa300) /* addsp xx */
{
- pifsr->reg = reg;
- pifsr->offset = (insn & 0x007e) << 1;
- pifsr->cur_frameoffset = pi->frameoffset;
-#ifdef DEBUG
- printf_filtered ("\tSaved register r%d, offset %d", reg, pifsr->offset);
-#endif
- pifsr++;
+ sp_offset += 4 * (signed char) (insn & 0xff);
+ }
+ else if ((insn & 0xff0f) == 0x9b00 && /* ldi:20 xx,r0 */
+ read_memory_unsigned_integer (current_pc + 4, 2)
+ == 0xac0f) /* sub r0,sp */
+ {
+ /* large stack adjustment */
+ sp_offset -= (((insn & 0xf0) << 12) | read_memory_unsigned_integer (current_pc + 2, 2));
+ current_pc += 4;
+ }
+ else if (insn == 0x9f80 && /* ldi:32 xx,r0 */
+ read_memory_unsigned_integer (current_pc + 6, 2)
+ == 0xac0f) /* sub r0,sp */
+ {
+ /* large stack adjustment */
+ sp_offset -=
+ (read_memory_unsigned_integer (current_pc + 2, 2) << 16 |
+ read_memory_unsigned_integer (current_pc + 4, 2));
+ current_pc += 6;
}
-
- if ((insn & 0x0780) >= 0x0600) /* Four byte instruction? */
- current_pc += 2;
-
-#ifdef DEBUG
- printf_filtered ("\n");
-#endif
- }
-
- if (pifsr)
- pifsr->framereg = 0; /* Tie off last entry */
-
- /* Fix up any offsets to the final offset. If a frame pointer was created, use it
- instead of the stack pointer. */
- for (pifsr_tmp = pi->pifsrs; pifsr_tmp && pifsr_tmp != pifsr; pifsr_tmp++)
- {
- pifsr_tmp->offset -= pi->frameoffset - pifsr_tmp->cur_frameoffset;
- pifsr_tmp->framereg = pi->framereg;
-
-#ifdef DEBUG
- printf_filtered ("Saved register r%d, offset = %d, framereg = r%d\n",
- pifsr_tmp->reg, pifsr_tmp->offset, pifsr_tmp->framereg);
-#endif
}
-#ifdef DEBUG
- printf_filtered ("Framereg = r%d, frameoffset = %d\n", pi->framereg, pi->frameoffset);
-#endif
+ /* The frame size is just the negative of the offset (from the original SP)
+ of the last thing thing we pushed on the stack. The frame offset is
+ [new FP] - [new SP]. */
+ fi->framesize = -sp_offset;
+ fi->frameoffset = fp_offset - sp_offset;
- return current_pc;
+ save_prologue_cache (fi);
}
/* Function: init_extra_frame_info
Note that when we are called for the last frame (currently active frame),
that fi->pc and fi->frame will already be setup. However, fi->frame will
be valid only if this routine uses FP. For previous frames, fi-frame will
- always be correct (since that is derived from xfr30_frame_chain ()).
+ always be correct (since that is derived from fr30_frame_chain ()).
We can be called with the PC in the call dummy under two circumstances.
First, during normal backtracing, second, while figuring out the frame
pointer just prior to calling the target function (see run_stack_dummy). */
void
-xfr30_init_extra_frame_info (fi)
- struct frame_info *fi;
+fr30_init_extra_frame_info (struct frame_info *fi)
{
- struct prologue_info pi;
- struct pifsr pifsrs[NUM_REGS + 1], *pifsr;
int reg;
if (fi->next)
memset (fi->fsr.regs, '\000', sizeof fi->fsr.regs);
- /* The call dummy doesn't save any registers on the stack, so we can return
- now. */
if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
- return;
-
- pi.pifsrs = pifsrs;
-
- xfr30_scan_prologue (fi->pc, &pi);
-
- if (!fi->next && pi.framereg == SP_REGNUM)
- fi->frame = read_register (pi.framereg) - pi.frameoffset;
-
- for (pifsr = pifsrs; pifsr->framereg; pifsr++)
{
- fi->fsr.regs[pifsr->reg] = pifsr->offset + fi->frame;
-
- if (pifsr->framereg == SP_REGNUM)
- fi->fsr.regs[pifsr->reg] += pi.frameoffset;
+ /* 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;
}
-}
+ fr30_scan_prologue (fi);
-/* Function: frame_chain
- Figure out the frame prior to FI. Unfortunately, this involves
- scanning the prologue of the caller, which will also be done
- shortly by xfr30_init_extra_frame_info. For the dummy frame, we
- just return the stack pointer that was in use at the time the
- function call was made. */
-
-CORE_ADDR
-xfr30_frame_chain (fi)
- struct frame_info *fi;
-{
- struct prologue_info pi;
- CORE_ADDR callers_pc, fp;
-
- /* First, find out who called us */
- callers_pc = FRAME_SAVED_PC (fi);
- /* If caller is a call-dummy, then our FP bears no relation to his FP! */
- fp = xfr30_find_callers_reg (fi, FP_RAW_REGNUM);
- if (PC_IN_CALL_DUMMY(callers_pc, fp, fp))
- return fp; /* caller is call-dummy: return oldest value of FP */
-
- /* Caller is NOT a call-dummy, so everything else should just work.
- Even if THIS frame is a call-dummy! */
- pi.pifsrs = NULL;
-
- xfr30_scan_prologue (callers_pc, &pi);
-
- if (pi.start_function)
- return 0; /* Don't chain beyond the start function */
-
- if (pi.framereg == FP_RAW_REGNUM)
- return xfr30_find_callers_reg (fi, pi.framereg);
-
- return fi->frame - pi.frameoffset;
+ if (!fi->next) /* this is the innermost frame? */
+ fi->frame = read_register (fi->framereg);
+ else
+ /* not the innermost frame */
+ /* If we have an FP, the callee saved it. */
+ if (fi->framereg == FP_REGNUM)
+ if (fi->next->fsr.regs[fi->framereg] != 0)
+ fi->frame = read_memory_integer (fi->next->fsr.regs[fi->framereg], 4);
+
+ /* Calculate actual addresses of saved registers using offsets determined
+ by fr30_scan_prologue. */
+ for (reg = 0; reg < NUM_REGS; reg++)
+ if (fi->fsr.regs[reg] != 0)
+ {
+ fi->fsr.regs[reg] += fi->frame + fi->framesize - fi->frameoffset;
+ }
}
/* Function: find_callers_reg
frame. */
CORE_ADDR
-xfr30_find_callers_reg (fi, regnum)
- struct frame_info *fi;
- int regnum;
+fr30_find_callers_reg (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_unsigned_integer (fi->fsr.regs[regnum],
- REGISTER_RAW_SIZE(regnum));
+ return read_memory_unsigned_integer (fi->fsr.regs[regnum],
+ REGISTER_RAW_SIZE (regnum));
return read_register (regnum);
}
-/* Function: skip_prologue
- Return the address of the first code past the prologue of the function. */
-
-CORE_ADDR
-xfr30_skip_prologue (pc)
- CORE_ADDR pc;
-{
- CORE_ADDR func_addr, func_end;
-
- /* See what the symbol table says */
-
- 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)
- 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: pop_frame
- This routine gets called when either the user uses the `return'
- command, or the call dummy breakpoint gets hit. */
-
-void
-xfr30_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
- {
- write_register (PC_REGNUM, FRAME_SAVED_PC (frame));
-
- for (regnum = 0; regnum < NUM_REGS; regnum++)
- if (frame->fsr.regs[regnum] != 0)
- write_register (regnum,
- read_memory_unsigned_integer (frame->fsr.regs[regnum],
- REGISTER_RAW_SIZE(regnum)));
-
- write_register (SP_REGNUM, FRAME_FP (frame));
- }
- flush_cached_frames ();
-}
-
-/* Function: push_arguments
- Setup arguments and RP for a call to the target. First four args
- go in R6->R9, subsequent args go into sp + 16 -> sp + ... Structs
- are passed by reference. 64 bit quantities (doubles and long
- longs) may be split between the regs and the stack. When calling a
- function that returns a struct, a pointer to the struct is passed
- in as a secret first argument (always in R6).
+/* Function: frame_chain
+ Figure out the frame prior to FI. Unfortunately, this involves
+ scanning the prologue of the caller, which will also be done
+ shortly by fr30_init_extra_frame_info. For the dummy frame, we
+ just return the stack pointer that was in use at the time the
+ function call was made. */
- Stack space for the args has NOT been allocated: that job is up to us.
- */
CORE_ADDR
-xfr30_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;
+fr30_frame_chain (struct frame_info *fi)
{
- int argreg;
- int argnum;
- int len = 0;
- int stack_offset;
-
- /* First, just for safety, make sure stack is aligned */
- sp &= ~3;
-
- /* Now make space on the stack for the args. */
- for (argnum = 0; argnum < nargs; argnum++)
- len += ((TYPE_LENGTH(VALUE_TYPE(args[argnum])) + 3) & ~3);
- sp -= len; /* possibly over-allocating, but it works... */
- /* (you might think we could allocate 16 bytes */
- /* less, but the ABI seems to use it all! ) */
- argreg = ARG0_REGNUM;
-
- /* the struct_return pointer occupies the first parameter-passing reg */
- if (struct_return)
- write_register (argreg++, struct_addr);
-
- stack_offset = 16;
- /* The offset onto the stack at which we will start copying parameters
- (after the registers are used up) begins at 16 rather than at zero.
- I don't really know why, that's just the way it seems to work. */
-
- /* 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. */
- for (argnum = 0; argnum < nargs; argnum++)
- {
- int len;
- char *val;
- char valbuf[REGISTER_RAW_SIZE(ARG0_REGNUM)];
-
- if (TYPE_CODE (VALUE_TYPE (*args)) == TYPE_CODE_STRUCT
- && TYPE_LENGTH (VALUE_TYPE (*args)) > 8)
- {
- store_address (valbuf, 4, VALUE_ADDRESS (*args));
- len = 4;
- val = valbuf;
- }
- else
- {
- len = TYPE_LENGTH (VALUE_TYPE (*args));
- val = (char *)VALUE_CONTENTS (*args);
- }
-
- while (len > 0)
- if (argreg <= ARGLAST_REGNUM)
- {
- CORE_ADDR regval;
-
- regval = extract_address (val, REGISTER_RAW_SIZE (argreg));
- write_register (argreg, regval);
-
- len -= REGISTER_RAW_SIZE (argreg);
- val += REGISTER_RAW_SIZE (argreg);
- argreg++;
- }
- else
- {
- write_memory (sp + stack_offset, val, 4);
+ CORE_ADDR fn_start, callers_pc, fp;
+ struct frame_info caller_fi;
+ int framereg;
- len -= 4;
- val += 4;
- stack_offset += 4;
- }
- args++;
- }
- return sp;
+ /* 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 = fr30_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 */
+
+ framereg = fi->framereg;
+
+ /* If the caller is the startup code, we're at the end of the chain. */
+ if (find_pc_partial_function (callers_pc, 0, &fn_start, 0))
+ if (fn_start == entry_point_address ())
+ return 0;
+
+ memset (&caller_fi, 0, sizeof (caller_fi));
+ caller_fi.pc = callers_pc;
+ fr30_scan_prologue (&caller_fi);
+ framereg = caller_fi.framereg;
+
+ /* If the caller used a frame register, return its value.
+ Otherwise, return the caller's stack pointer. */
+ if (framereg == FP_REGNUM)
+ return fr30_find_callers_reg (fi, framereg);
+ else
+ return fi->frame + fi->framesize;
}
-/* Function: push_return_address (pc)
- Set up the return address for the inferior function call.
- Needed for targets where we don't actually execute a JSR/BSR instruction */
-
-CORE_ADDR
-xfr30_push_return_address (pc, sp)
- CORE_ADDR pc;
- CORE_ADDR sp;
-{
- write_register (RP_REGNUM, CALL_DUMMY_ADDRESS ());
- return sp;
-}
-
/* Function: frame_saved_pc
Find the caller of this frame. We do this by seeing if RP_REGNUM
is saved in the stack anywhere, otherwise we get it from the
will be found. */
CORE_ADDR
-xfr30_frame_saved_pc (fi)
- struct frame_info *fi;
+fr30_frame_saved_pc (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);
+ if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
+ return generic_read_register_dummy (fi->pc, fi->frame, PC_REGNUM);
else
- return xfr30_find_callers_reg (fi, RP_REGNUM);
+ return fr30_find_callers_reg (fi, RP_REGNUM);
}
-void
-get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval)
- char *raw_buffer;
- int *optimized;
- CORE_ADDR *addrp;
- struct frame_info *frame;
- int regnum;
- enum lval_type *lval;
-{
- generic_get_saved_register (raw_buffer, optimized, addrp,
- frame, regnum, lval);
-}
-
-
/* Function: fix_call_dummy
Pokes the callee function's address into the CALL_DUMMY assembly stub.
Assumes that the CALL_DUMMY looks like this:
- jarl <offset24>, r31
- trap
- */
+ jarl <offset24>, r31
+ trap
+ */
int
-xfr30_fix_call_dummy (dummy, sp, fun, nargs, args, type, gcc_p)
- char *dummy;
- CORE_ADDR sp;
- CORE_ADDR fun;
- int nargs;
- value_ptr *args;
- struct type *type;
- int gcc_p;
+fr30_fix_call_dummy (char *dummy, CORE_ADDR sp, CORE_ADDR fun, int nargs,
+ value_ptr *args, struct type *type, int gcc_p)
{
long offset24;
offset24 &= 0x3fffff;
offset24 |= 0xff800000; /* jarl <offset24>, r31 */
- store_unsigned_integer ((unsigned int *)&dummy[2], 2, offset24 & 0xffff);
- store_unsigned_integer ((unsigned int *)&dummy[0], 2, offset24 >> 16);
+ store_unsigned_integer ((unsigned int *) &dummy[2], 2, offset24 & 0xffff);
+ store_unsigned_integer ((unsigned int *) &dummy[0], 2, offset24 >> 16);
return 0;
}
-
-#endif /* Z.R. */
projects / deliverable / binutils-gdb.git / blobdiff