#include "objfiles.h"
#include "xcoffsolib.h"
-extern struct obstack frame_cache_obstack;
-
extern int errno;
/* Breakpoint shadows for the single step instructions will be kept here. */
static CORE_ADDR branch_dest PARAMS ((int opcode, int instr, CORE_ADDR pc,
CORE_ADDR safety));
-static void frame_get_cache_fsr PARAMS ((struct frame_info *fi,
- struct rs6000_framedata *fdatap));
+static void frame_get_saved_regs PARAMS ((struct frame_info *fi,
+ struct rs6000_framedata *fdatap));
static void pop_dummy_frame PARAMS ((void));
+static CORE_ADDR frame_initial_stack_address PARAMS ((struct frame_info *));
+
+/* Fill in fi->saved_regs */
+
+struct frame_extra_info
+{
+ /* Functions calling alloca() change the value of the stack
+ pointer. We need to use initial stack pointer (which is saved in
+ r31 by gcc) in such cases. If a compiler emits traceback table,
+ then we should use the alloca register specified in traceback
+ table. FIXME. */
+ CORE_ADDR initial_sp; /* initial stack pointer. */ \
+};
+
+void
+rs6000_init_extra_frame_info (fromleaf, fi)
+ int fromleaf;
+ struct frame_info *fi;
+{
+ fi->extra_info = (struct frame_extra_info*)
+ frame_obstack_alloc (sizeof (struct frame_extra_info));
+ fi->extra_info->initial_sp = 0;
+ if (fi->next != (CORE_ADDR) 0
+ && fi->pc < TEXT_SEGMENT_BASE)
+ /* We're in get_prev_frame_info */
+ /* and this is a special signal frame. */
+ /* (fi->pc will be some low address in the kernel, */
+ /* to which the signal handler returns). */
+ fi->signal_handler_caller = 1;
+}
+
+
+void
+rs6000_frame_init_saved_regs (fi)
+ struct frame_info *fi;
+{
+ frame_get_saved_regs (fi, NULL);
+}
+
+CORE_ADDR
+rs6000_frame_args_address (fi)
+ struct frame_info *fi;
+{
+ if (fi->extra_info->initial_sp != 0)
+ return fi->extra_info->initial_sp;
+ else
+ return frame_initial_stack_address (fi);
+}
+
+
/* Calculate the destination of a branch/jump. Return -1 if not a branch. */
static CORE_ADDR
/* return pc value after skipping a function prologue and also return
information about a function frame.
- in struct rs6000_frameinfo fdata:
+ in struct rs6000_framedata fdata:
- frameless is TRUE, if function does not have a frame.
- nosavedpc is TRUE, if function does not save %pc value in its frame.
- - offset is the number of bytes used in the frame to save registers.
+ - offset is the initial size of this stack frame --- the amount by
+ which we decrement the sp to allocate the frame.
- saved_gpr is the number of the first saved gpr.
- saved_fpr is the number of the first saved fpr.
- alloca_reg is the number of the register used for alloca() handling.
Otherwise -1.
- - gpr_offset is the offset of the saved gprs
- - fpr_offset is the offset of the saved fprs
+ - gpr_offset is the offset of the first saved gpr from the previous frame.
+ - fpr_offset is the offset of the first saved fpr from the previous frame.
- lr_offset is the offset of the saved lr
- cr_offset is the offset of the saved cr
- */
+*/
#define SIGNED_SHORT(x) \
((sizeof (short) == 2) \
pc = read_register(PC_REGNUM);
store_address (pc_targ, 4, pc);
- skip_prologue (get_pc_function_start (pc) + FUNCTION_START_OFFSET, &fdata);
+ skip_prologue (get_pc_function_start (pc), &fdata);
dummy_frame_addr [dummy_frame_count++] = sp;
still in the link register, otherwise walk the frames and retrieve the
saved %pc value in the previous frame. */
- addr = get_pc_function_start (frame->pc) + FUNCTION_START_OFFSET;
+ addr = get_pc_function_start (frame->pc);
(void) skip_prologue (addr, &fdata);
if (fdata.frameless)
write_register (PC_REGNUM, lr);
/* reset register values if any was saved earlier. */
- addr = prev_sp - fdata.offset;
if (fdata.saved_gpr != -1)
- for (ii = fdata.saved_gpr; ii <= 31; ++ii) {
- read_memory (addr, ®isters [REGISTER_BYTE (ii)], 4);
- addr += 4;
+ {
+ addr = prev_sp + fdata.gpr_offset;
+ for (ii = fdata.saved_gpr; ii <= 31; ++ii) {
+ read_memory (addr, ®isters [REGISTER_BYTE (ii)], 4);
+ addr += 4;
+ }
}
if (fdata.saved_fpr != -1)
- for (ii = fdata.saved_fpr; ii <= 31; ++ii) {
- read_memory (addr, ®isters [REGISTER_BYTE (ii+FP0_REGNUM)], 8);
- addr += 8;
- }
+ {
+ addr = prev_sp + fdata.fpr_offset;
+ for (ii = fdata.saved_fpr; ii <= 31; ++ii) {
+ read_memory (addr, ®isters [REGISTER_BYTE (ii+FP0_REGNUM)], 8);
+ addr += 8;
+ }
+ }
write_register (SP_REGNUM, prev_sp);
target_store_registers (-1);
return 0;
}
- func_start += FUNCTION_START_OFFSET;
(void) skip_prologue (func_start, &fdata);
return fdata.frameless;
}
return generic_read_register_dummy(fi->pc, fi->frame, PC_REGNUM);
#endif /* GENERIC_DUMMY_FRAMES */
- func_start = get_pc_function_start (fi->pc) + FUNCTION_START_OFFSET;
+ func_start = get_pc_function_start (fi->pc);
/* If we failed to find the start of the function, it is a mistake
to inspect the instructions. */
in which case the framedata are read. */
static void
-frame_get_cache_fsr (fi, fdatap)
+frame_get_saved_regs (fi, fdatap)
struct frame_info *fi;
struct rs6000_framedata *fdatap;
{
CORE_ADDR frame_addr;
struct rs6000_framedata work_fdata;
- if (fi->cache_fsr)
+ if (fi->saved_regs)
return;
- if (fdatap == NULL) {
- fdatap = &work_fdata;
- (void) skip_prologue (get_pc_function_start (fi->pc), fdatap);
- }
+ if (fdatap == NULL)
+ {
+ fdatap = &work_fdata;
+ (void) skip_prologue (get_pc_function_start (fi->pc), fdatap);
+ }
+
+ frame_saved_regs_zalloc (fi);
- fi->cache_fsr = (struct frame_saved_regs *)
- obstack_alloc (&frame_cache_obstack, sizeof (struct frame_saved_regs));
- memset (fi->cache_fsr, '\0', sizeof (struct frame_saved_regs));
+ /* If there were any saved registers, figure out parent's stack
+ pointer. */
+ /* The following is true only if the frame doesn't have a call to
+ alloca(), FIXME. */
- if (fi->prev && fi->prev->frame)
+ if (fdatap->saved_fpr == 0 && fdatap->saved_gpr == 0
+ && fdatap->lr_offset == 0 && fdatap->cr_offset == 0)
+ frame_addr = 0;
+ else if (fi->prev && fi->prev->frame)
frame_addr = fi->prev->frame;
else
frame_addr = read_memory_integer (fi->frame, 4);
/* if != -1, fdatap->saved_fpr is the smallest number of saved_fpr.
All fpr's from saved_fpr to fp31 are saved. */
- if (fdatap->saved_fpr >= 0) {
- int fpr_offset = frame_addr + fdatap->fpr_offset;
- for (ii = fdatap->saved_fpr; ii < 32; ii++) {
- fi->cache_fsr->regs [FP0_REGNUM + ii] = fpr_offset;
- fpr_offset += 8;
+ if (fdatap->saved_fpr >= 0)
+ {
+ int i;
+ int fpr_offset = frame_addr + fdatap->fpr_offset;
+ for (i = fdatap->saved_fpr; i < 32; i++)
+ {
+ fi->saved_regs [FP0_REGNUM + i] = fpr_offset;
+ fpr_offset += 8;
+ }
}
- }
/* if != -1, fdatap->saved_gpr is the smallest number of saved_gpr.
All gpr's from saved_gpr to gpr31 are saved. */
-
- if (fdatap->saved_gpr >= 0) {
- int gpr_offset = frame_addr + fdatap->gpr_offset;
- for (ii = fdatap->saved_gpr; ii < 32; ii++) {
- fi->cache_fsr->regs [ii] = gpr_offset;
- gpr_offset += 4;
+
+ if (fdatap->saved_gpr >= 0)
+ {
+ int i;
+ int gpr_offset = frame_addr + fdatap->gpr_offset;
+ for (i = fdatap->saved_gpr; i < 32; i++)
+ {
+ fi->saved_regs [i] = gpr_offset;
+ gpr_offset += 4;
+ }
}
- }
/* If != 0, fdatap->cr_offset is the offset from the frame that holds
the CR. */
if (fdatap->cr_offset != 0)
- fi->cache_fsr->regs [CR_REGNUM] = frame_addr + fdatap->cr_offset;
+ fi->saved_regs [CR_REGNUM] = frame_addr + fdatap->cr_offset;
/* If != 0, fdatap->lr_offset is the offset from the frame that holds
the LR. */
if (fdatap->lr_offset != 0)
- fi->cache_fsr->regs [LR_REGNUM] = frame_addr + fdatap->lr_offset;
+ fi->saved_regs [LR_REGNUM] = frame_addr + fdatap->lr_offset;
}
/* Return the address of a frame. This is the inital %sp value when the frame
was first allocated. For functions calling alloca(), it might be saved in
an alloca register. */
-CORE_ADDR
+static CORE_ADDR
frame_initial_stack_address (fi)
struct frame_info *fi;
{
/* if the initial stack pointer (frame address) of this frame is known,
just return it. */
- if (fi->initial_sp)
- return fi->initial_sp;
+ if (fi->extra_info->initial_sp)
+ return fi->extra_info->initial_sp;
/* find out if this function is using an alloca register.. */
/* if saved registers of this frame are not known yet, read and cache them. */
- if (!fi->cache_fsr)
- frame_get_cache_fsr (fi, &fdata);
+ if (!fi->saved_regs)
+ frame_get_saved_regs (fi, &fdata);
/* If no alloca register used, then fi->frame is the value of the %sp for
this frame, and it is good enough. */
- if (fdata.alloca_reg < 0) {
- fi->initial_sp = fi->frame;
- return fi->initial_sp;
- }
+ if (fdata.alloca_reg < 0)
+ {
+ fi->extra_info->initial_sp = fi->frame;
+ return fi->extra_info->initial_sp;
+ }
/* This function has an alloca register. If this is the top-most frame
(with the lowest address), the value in alloca register is good. */
if (!fi->next)
- return fi->initial_sp = read_register (fdata.alloca_reg);
+ return fi->extra_info->initial_sp = read_register (fdata.alloca_reg);
/* Otherwise, this is a caller frame. Callee has usually already saved
registers, but there are exceptions (such as when the callee
for (callee_fi = fi->next; callee_fi; callee_fi = callee_fi->next) {
- if (!callee_fi->cache_fsr)
- frame_get_cache_fsr (callee_fi, NULL);
+ if (!callee_fi->saved_regs)
+ frame_get_saved_regs (callee_fi, NULL);
/* this is the address in which alloca register is saved. */
- tmpaddr = callee_fi->cache_fsr->regs [fdata.alloca_reg];
+ tmpaddr = callee_fi->saved_regs [fdata.alloca_reg];
if (tmpaddr) {
- fi->initial_sp = read_memory_integer (tmpaddr, 4);
- return fi->initial_sp;
+ fi->extra_info->initial_sp = read_memory_integer (tmpaddr, 4);
+ return fi->extra_info->initial_sp;
}
/* Go look into deeper levels of the frame chain to see if any one of
/* If alloca register was not saved, by the callee (or any of its callees)
then the value in the register is still good. */
- return fi->initial_sp = read_register (fdata.alloca_reg);
+ fi->extra_info->initial_sp = read_register (fdata.alloca_reg);
+ return fi->extra_info->initial_sp;
}
CORE_ADDR
projects / deliverable / binutils-gdb.git / blobdiff