#include "opcode/mips.h"
#define VM_MIN_ADDRESS (unsigned)0x400000
+
+/* FIXME: Put this declaration in frame.h. */
+extern struct obstack frame_cache_obstack;
\f
#if 0
static int mips_in_lenient_prologue PARAMS ((CORE_ADDR, CORE_ADDR));
} *linked_proc_desc_table = NULL;
\f
-#define READ_FRAME_REG(fi, regno) read_next_frame_reg((fi)->next, regno)
+/* Guaranteed to set fci->saved_regs to some values (it never leaves it
+ NULL). */
+
+void
+mips_find_saved_regs (fci)
+ FRAME fci;
+{
+ int ireg;
+ CORE_ADDR reg_position;
+ /* r0 bit means kernel trap */
+ int kernel_trap;
+ /* What registers have been saved? Bitmasks. */
+ unsigned long gen_mask, float_mask;
+ mips_extra_func_info_t proc_desc;
+
+ fci->saved_regs = (struct frame_saved_regs *)
+ obstack_alloc (&frame_cache_obstack, sizeof(struct frame_saved_regs));
+ memset (fci->saved_regs, 0, sizeof (struct frame_saved_regs));
+
+ proc_desc = fci->proc_desc;
+ if (proc_desc == NULL)
+ /* I'm not sure how/whether this can happen. Normally when we can't
+ find a proc_desc, we "synthesize" one using heuristic_proc_desc
+ and set the saved_regs right away. */
+ return;
+
+ kernel_trap = PROC_REG_MASK(proc_desc) & 1;
+ gen_mask = kernel_trap ? 0xFFFFFFFF : PROC_REG_MASK(proc_desc);
+ float_mask = kernel_trap ? 0xFFFFFFFF : PROC_FREG_MASK(proc_desc);
+
+ if (/* In any frame other than the innermost, we assume that all
+ registers have been saved. This assumes that all register
+ saves in a function happen before the first function
+ call. */
+ fci->next == NULL
+
+ /* In a dummy frame we know exactly where things are saved. */
+ && !PROC_DESC_IS_DUMMY (proc_desc)
+
+ /* Not sure exactly what kernel_trap means, but if it means
+ the kernel saves the registers without a prologue doing it,
+ we better not examine the prologue to see whether registers
+ have been saved yet. */
+ && !kernel_trap)
+ {
+ /* We need to figure out whether the registers that the proc_desc
+ claims are saved have been saved yet. */
+
+ CORE_ADDR addr;
+ int status;
+ char buf[4];
+ unsigned long inst;
+
+ /* Bitmasks; set if we have found a save for the register. */
+ unsigned long gen_save_found = 0;
+ unsigned long float_save_found = 0;
+
+ for (addr = PROC_LOW_ADDR (proc_desc);
+ addr < fci->pc /*&& (gen_mask != gen_save_found
+ || float_mask != float_save_found)*/;
+ addr += 4)
+ {
+ status = read_memory_nobpt (addr, buf, 4);
+ if (status)
+ memory_error (status, addr);
+ inst = extract_unsigned_integer (buf, 4);
+ if (/* sw reg,n($sp) */
+ (inst & 0xffe00000) == 0xafa00000
+
+ /* sw reg,n($r30) */
+ || (inst & 0xffe00000) == 0xafc00000
+
+ /* sd reg,n($sp) */
+ || (inst & 0xffe00000) == 0xffa00000)
+ {
+ /* It might be possible to use the instruction to
+ find the offset, rather than the code below which
+ is based on things being in a certain order in the
+ frame, but figuring out what the instruction's offset
+ is relative to might be a little tricky. */
+ int reg = (inst & 0x001f0000) >> 16;
+ gen_save_found |= (1 << reg);
+ }
+ else if (/* swc1 freg,n($sp) */
+ (inst & 0xffe00000) == 0xe7a00000
+
+ /* swc1 freg,n($r30) */
+ || (inst & 0xffe00000) == 0xe7c00000
+
+ /* sdc1 freg,n($sp) */
+ || (inst & 0xffe00000) == 0xf7a00000)
+
+ {
+ int reg = ((inst & 0x001f0000) >> 16);
+ float_save_found |= (1 << reg);
+ }
+ }
+ gen_mask = gen_save_found;
+ float_mask = float_save_found;
+ }
+
+ /* Fill in the offsets for the registers which gen_mask says
+ were saved. */
+ reg_position = fci->frame + PROC_REG_OFFSET (proc_desc);
+ for (ireg= 31; gen_mask; --ireg, gen_mask <<= 1)
+ if (gen_mask & 0x80000000)
+ {
+ fci->saved_regs->regs[ireg] = reg_position;
+ reg_position -= MIPS_REGSIZE;
+ }
+ /* Fill in the offsets for the registers which float_mask says
+ were saved. */
+ reg_position = fci->frame + PROC_FREG_OFFSET (proc_desc);
+
+ /* The freg_offset points to where the first *double* register
+ is saved. So skip to the high-order word. */
+ reg_position += 4;
+ for (ireg = 31; float_mask; --ireg, float_mask <<= 1)
+ if (float_mask & 0x80000000)
+ {
+ fci->saved_regs->regs[FP0_REGNUM+ireg] = reg_position;
+ reg_position -= MIPS_REGSIZE;
+ }
+
+ fci->saved_regs->regs[PC_REGNUM] = fci->saved_regs->regs[RA_REGNUM];
+}
static int
read_next_frame_reg(fi, regno)
#define SIGFRAME_REG_SIZE 4
#endif
for (; fi; fi = fi->next)
- if (fi->signal_handler_caller) {
+ {
+ if (fi->signal_handler_caller)
+ {
int offset;
if (regno == PC_REGNUM) offset = SIGFRAME_PC_OFF;
else if (regno < 32) offset = (SIGFRAME_REGSAVE_OFF
+ regno * SIGFRAME_REG_SIZE);
else return 0;
- return read_memory_integer(fi->frame + offset, 4);
- }
+ return read_memory_integer(fi->frame + offset, MIPS_REGSIZE);
+ }
else if (regno == SP_REGNUM) return fi->frame;
- else if (fi->saved_regs->regs[regno])
- return read_memory_integer(fi->saved_regs->regs[regno], 4);
- return read_register(regno);
+ else
+ {
+ if (fi->saved_regs == NULL)
+ mips_find_saved_regs (fi);
+ if (fi->saved_regs->regs[regno])
+ return read_memory_integer(fi->saved_regs->regs[regno], MIPS_REGSIZE);
+ }
+ }
+ return read_register (regno);
}
int
init_extra_frame_info(fci)
struct frame_info *fci;
{
- extern struct obstack frame_cache_obstack;
/* Use proc_desc calculated in frame_chain */
mips_extra_func_info_t proc_desc =
fci->next ? cached_proc_desc : find_proc_desc(fci->pc, fci->next);
- fci->saved_regs = (struct frame_saved_regs*)
- obstack_alloc (&frame_cache_obstack, sizeof(struct frame_saved_regs));
- memset (fci->saved_regs, 0, sizeof (struct frame_saved_regs));
+ fci->saved_regs = NULL;
fci->proc_desc =
proc_desc == &temp_proc_desc ? 0 : proc_desc;
if (proc_desc)
{
- int ireg;
- CORE_ADDR reg_position;
- /* r0 bit means kernel trap */
- int kernel_trap = PROC_REG_MASK(proc_desc) & 1;
-
/* Fixup frame-pointer - only needed for top frame */
/* This may not be quite right, if proc has a real frame register.
Get the value of the frame relative sp, procedure might have been
interrupted by a signal at it's very start. */
- if (fci->pc == PROC_LOW_ADDR(proc_desc) && !PROC_DESC_IS_DUMMY(proc_desc))
- fci->frame = READ_FRAME_REG(fci, SP_REGNUM);
+ if (fci->pc == PROC_LOW_ADDR (proc_desc)
+ && !PROC_DESC_IS_DUMMY (proc_desc))
+ fci->frame = read_next_frame_reg (fci->next, SP_REGNUM);
else
- fci->frame = READ_FRAME_REG(fci, PROC_FRAME_REG(proc_desc))
- + PROC_FRAME_OFFSET(proc_desc);
+ fci->frame =
+ read_next_frame_reg (fci->next, PROC_FRAME_REG (proc_desc))
+ + PROC_FRAME_OFFSET (proc_desc);
if (proc_desc == &temp_proc_desc)
- *fci->saved_regs = temp_saved_regs;
- else
{
- /* What registers have been saved? Bitmasks. */
- unsigned long gen_mask, float_mask;
-
- gen_mask = kernel_trap ? 0xFFFFFFFF : PROC_REG_MASK(proc_desc);
- float_mask = kernel_trap ? 0xFFFFFFFF : PROC_FREG_MASK(proc_desc);
-
- if (/* In any frame other than the innermost, we assume that all
- registers have been saved. This assumes that all register
- saves in a function happen before the first function
- call. */
- fci->next == NULL
-
- /* In a dummy frame we know exactly where things are saved. */
- && !PROC_DESC_IS_DUMMY (proc_desc)
-
- /* Not sure exactly what kernel_trap means, but if it means
- the kernel saves the registers without a prologue doing it,
- we better not examine the prologue to see whether registers
- have been saved yet. */
- && !kernel_trap)
- {
- /* We need to figure out whether the registers that the proc_desc
- claims are saved have been saved yet. */
-
- CORE_ADDR addr;
- int status;
- char buf[4];
- unsigned long inst;
-
- /* Bitmasks; set if we have found a save for the register. */
- unsigned long gen_save_found = 0;
- unsigned long float_save_found = 0;
-
- for (addr = PROC_LOW_ADDR (proc_desc);
- addr < fci->pc && (gen_mask != gen_save_found
- || float_mask != float_save_found);
- addr += 4)
- {
- status = read_memory_nobpt (addr, buf, 4);
- if (status)
- memory_error (status, addr);
- inst = extract_unsigned_integer (buf, 4);
- if (/* sw reg,n($sp) */
- (inst & 0xffe00000) == 0xafa00000
-
- /* sw reg,n($r30) */
- || (inst & 0xffe00000) == 0xafc00000)
- {
- /* It might be possible to use the instruction to
- find the offset, rather than the code below which
- is based on things being in a certain order in the
- frame, but figuring out what the instruction's offset
- is relative to might be a little tricky. */
- int reg = (inst & 0x001f0000) >> 16;
- gen_save_found |= (1 << reg);
- }
- else if (/* swc1 freg,n($sp) */
- (inst & 0xffe00000) == 0xe7a00000
-
- /* swc1 freg,n($r30) */
- || (inst & 0xffe00000) == 0xe7c00000)
- {
- int reg = ((inst & 0x001f0000) >> 16);
- float_save_found |= (1 << reg);
- }
- }
- gen_mask = gen_save_found;
- float_mask = float_save_found;
- }
-
- /* Fill in the offsets for the registers which gen_mask says
- were saved. */
- reg_position = fci->frame + PROC_REG_OFFSET (proc_desc);
- for (ireg= 31; gen_mask; --ireg, gen_mask <<= 1)
- if (gen_mask & 0x80000000)
- {
- fci->saved_regs->regs[ireg] = reg_position;
- reg_position -= 4;
- }
- /* Fill in the offsets for the registers which float_mask says
- were saved. */
- reg_position = fci->frame + PROC_FREG_OFFSET (proc_desc);
-
- /* The freg_offset points to where the first *double* register
- is saved. So skip to the high-order word. */
- reg_position += 4;
- for (ireg = 31; float_mask; --ireg, float_mask <<= 1)
- if (float_mask & 0x80000000)
- {
- fci->saved_regs->regs[FP0_REGNUM+ireg] = reg_position;
- reg_position -= 4;
- }
+ fci->saved_regs = (struct frame_saved_regs*)
+ obstack_alloc (&frame_cache_obstack,
+ sizeof (struct frame_saved_regs));
+ *fci->saved_regs = temp_saved_regs;
+ fci->saved_regs->regs[PC_REGNUM] = fci->saved_regs->regs[RA_REGNUM];
}
/* hack: if argument regs are saved, guess these contain args */
else if ((PROC_REG_MASK(proc_desc) & 0x40) == 0) fci->num_args = 3;
else if ((PROC_REG_MASK(proc_desc) & 0x20) == 0) fci->num_args = 2;
else if ((PROC_REG_MASK(proc_desc) & 0x10) == 0) fci->num_args = 1;
-
- fci->saved_regs->regs[PC_REGNUM] = fci->saved_regs->regs[RA_REGNUM];
}
}
CORE_ADDR struct_addr;
{
register i;
- int accumulate_size = struct_return ? 4 : 0;
+ int accumulate_size = struct_return ? MIPS_REGSIZE : 0;
struct mips_arg { char *contents; int len; int offset; };
struct mips_arg *mips_args =
- (struct mips_arg*)alloca(nargs * sizeof(struct mips_arg));
+ (struct mips_arg*)alloca((nargs + 4) * sizeof(struct mips_arg));
register struct mips_arg *m_arg;
+ int fake_args = 0;
+
for (i = 0, m_arg = mips_args; i < nargs; i++, m_arg++) {
extern value value_arg_coerce();
value arg = value_arg_coerce (args[i]);
* breaks their varargs implementation...). A correct solution
* requires an simulation of gcc's 'alignof' (and use of 'alignof'
* in stdarg.h/varargs.h).
+ * On the 64 bit r4000 we always pass the first four arguments
+ * using eight bytes each, so that we can load them up correctly
+ * in CALL_DUMMY.
*/
- if (m_arg->len > 4) accumulate_size = (accumulate_size + 7) & -8;
+ if (m_arg->len > 4)
+ accumulate_size = (accumulate_size + 7) & -8;
m_arg->offset = accumulate_size;
- accumulate_size = (accumulate_size + m_arg->len + 3) & -4;
m_arg->contents = VALUE_CONTENTS(arg);
+#ifndef GDB_TARGET_IS_MIPS64
+ accumulate_size = (accumulate_size + m_arg->len + 3) & -4;
+#else
+ if (accumulate_size >= 4 * MIPS_REGSIZE)
+ accumulate_size = (accumulate_size + m_arg->len + 3) &~ 4;
+ else
+ {
+ static char zeroes[8] = { 0 };
+ int len = m_arg->len;
+
+ if (len < 8)
+ {
+#if TARGET_BYTE_ORDER == BIG_ENDIAN
+ m_arg->offset += 8 - len;
+#endif
+ ++m_arg;
+ m_arg->len = 8 - len;
+ m_arg->contents = zeroes;
+#if TARGET_BYTE_ORDER == BIG_ENDIAN
+ m_arg->offset = accumulate_size;
+#else
+ m_arg->offset = accumulate_size + len;
+#endif
+ ++fake_args;
+ }
+ accumulate_size = (accumulate_size + len + 7) & ~8;
+ }
+#endif
}
accumulate_size = (accumulate_size + 7) & (-8);
- if (accumulate_size < 16) accumulate_size = 16;
+ if (accumulate_size < 4 * MIPS_REGSIZE)
+ accumulate_size = 4 * MIPS_REGSIZE;
sp -= accumulate_size;
- for (i = nargs; m_arg--, --i >= 0; )
+ for (i = nargs + fake_args; m_arg--, --i >= 0; )
write_memory(sp + m_arg->offset, m_arg->contents, m_arg->len);
if (struct_return)
{
mips_extra_func_info_t proc_desc = frame->proc_desc;
write_register (PC_REGNUM, FRAME_SAVED_PC(frame));
+ if (frame->saved_regs == NULL)
+ mips_find_saved_regs (frame);
if (proc_desc)
{
for (regnum = 32; --regnum >= 0; )
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