#include "gdbcore.h"
#include "symfile.h"
-niy(char *f, int l)
+__t(int l, char *s, int a)
{
- fprintf(stderr, "%s(%d): Not implemented yet\n", f, l);
+ fprintf(stderr, "(%d): %s: 0x%08x\n", l, s, a);
}
-#define NIY() niy(__FILE__, __LINE__)
+#define T(s, a) __t(__LINE__, s, (int)(a))
/* Function: pop_frame
This routine gets called when either the user uses the `return'
sal = find_pc_line (func_addr, 0);
- if (sal.line != 0 && sal.end < func_end)
+ 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),
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.
+
+ 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
+
+ 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 (fi)
+ struct frame_info * fi;
+{
+ 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;
+}
-/* Info gleaned from scanning a function's prologue. */
-struct pifsr /* Info about one saved reg */
-{
- int framereg; /* Frame reg (SP or FP) */
- int offset; /* Offset from framereg */
- int cur_frameoffset; /* Current frameoffset */
- int reg; /* Saved register number */
-};
+/* Function: save_prologue_cache
+ Copy the prologue information from fi to the prologue cache.
+*/
-struct prologue_info
+static void
+save_prologue_cache (fi)
+ struct frame_info * fi;
{
- int framereg;
- int frameoffset;
- int start_function;
- struct pifsr *pifsrs;
-};
-
-static CORE_ADDR fr30_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
-fr30_scan_prologue (pc, pi)
- CORE_ADDR pc;
- struct prologue_info *pi;
+static void
+fr30_scan_prologue (fi)
+ 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. */
+ /* Check if this function is already in the cache of frame information. */
+ if (check_prologue_cache (fi))
+ return;
- if (find_pc_partial_function (pc, NULL, &func_addr, NULL))
- {
- struct symtab_and_line sal;
-
- 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;
+ {
+ T("NIY", 0);
+ /* XXX ??? Z.R. Get address of the stmfd in the prologue of the callee; the saved
+ PC is the address of the stmfd + 12. */
+ prologue_start = (read_memory_integer (fi->frame, 4) & 0x03fffffc) - 12;
+ prologue_end = prologue_start + 40; /* FIXME: should be big enough */
}
- 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. */
-
- 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;
-
-#ifdef DEBUG
- printf_filtered ("Current_pc = 0x%.8lx, prologue_end = 0x%.8lx\n",
- (long)func_addr, (long)prologue_end);
-#endif
+ /* Now search the prologue looking for instructions that set up the
+ frame pointer, adjust the stack pointer, and save registers. */
- for (current_pc = func_addr; current_pc < prologue_end; current_pc += 2)
+ sp_offset = fp_offset = 0;
+ for (current_pc = prologue_start; current_pc < prologue_end; current_pc += 2)
{
- int insn;
-
-#ifdef DEBUG
- printf_filtered ("0x%.8lx ", (long)current_pc);
- (*tm_print_insn) (current_pc, &tm_print_insn_info);
-#endif
+ unsigned int insn;
insn = read_memory_unsigned_integer (current_pc, 2);
- 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;
+ if ((insn & 0xfe00) == 0x8e00) /* stm0 or stm1 */
+ {
+ int reg, mask = insn & 0xff;
+
+ /* 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 */
+ }
+
+ /* 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 & 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_REGNUM << 11) | 0x0000 | SP_REGNUM)) /* mov sp,fp */
+ else if(insn == 0x170e) /* st fp,@-sp */
{
- fp_used = 1;
- pi->framereg = FP_REGNUM;
+ sp_offset -= 4;
+ fi->fsr.regs[FP_REGNUM] = sp_offset;
}
-
-#if(0) /* Z.R. XXX */
- 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;
}
-#endif /* Z.R. */
-
- 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
-
- return current_pc;
+ /* 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;
+
+ save_prologue_cache (fi);
}
/* Function: init_extra_frame_info
void
fr30_init_extra_frame_info (fi)
- struct frame_info *fi;
+ 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;
-
- fr30_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);
+
+ 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
just return the stack pointer that was in use at the time the
function call was made. */
+
CORE_ADDR
fr30_frame_chain (fi)
- struct frame_info *fi;
+ struct frame_info * fi;
{
- struct prologue_info pi;
- CORE_ADDR callers_pc, fp;
+ CORE_ADDR fn_start, callers_pc, fp;
+ struct frame_info caller_fi;
+ int framereg;
- /* 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! */
+ /* 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; /* caller is call-dummy: return oldest value of FP */
+ if (PC_IN_CALL_DUMMY (callers_pc, fp, fp))
+ return fp; /* dummy frame's frame may bear no relation to ours */
- /* Caller is NOT a call-dummy, so everything else should just work.
- Even if THIS frame is a call-dummy! */
- pi.pifsrs = NULL;
+ 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 */
- fr30_scan_prologue (callers_pc, &pi);
+ framereg = fi->framereg;
- if (pi.start_function)
- return 0; /* Don't chain beyond the start function */
+ /* 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;
- if (pi.framereg == FP_REGNUM)
- return fr30_find_callers_reg (fi, pi.framereg);
+ memset (& caller_fi, 0, sizeof (caller_fi));
+ caller_fi.pc = callers_pc;
+ fr30_scan_prologue (& caller_fi);
+ framereg = caller_fi.framereg;
- return fi->frame - pi.frameoffset;
+ /* 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_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
+ go in R4->R7, subsequent args go on stack... 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
CORE_ADDR pc;
CORE_ADDR sp;
{
+T("fr30_push_return_address", CALL_DUMMY_ADDRESS ());
write_register (RP_REGNUM, CALL_DUMMY_ADDRESS ());
return sp;
}
projects / binutils-gdb.git / commitdiff