struct m88k_frame_cache *
m88k_frame_cache (struct frame_info *next_frame, void **this_cache)
{
struct m88k_frame_cache *cache;
CORE_ADDR frame_sp;
if (*this_cache)
return *this_cache;
cache = FRAME_OBSTACK_ZALLOC (struct m88k_frame_cache);
cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);
cache->fp_offset = -1;
cache->pc = frame_func_unwind (next_frame);
if (cache->pc != 0)
{
CORE_ADDR addr_in_block = frame_unwind_address_in_block (next_frame);
m88k_analyze_prologue (cache->pc, addr_in_block, cache);
}
/* Calculate the stack pointer used in the prologue. */
if (cache->fp_offset != -1)
{
CORE_ADDR fp;
fp = frame_unwind_register_unsigned (next_frame, M88K_R30_REGNUM);
frame_sp = fp - cache->fp_offset;
}
else
{
/* If we know where the return address is saved, we can take a
solid guess at what the frame pointer should be. */
if (cache->saved_regs[M88K_R1_REGNUM].addr != -1)
cache->fp_offset = cache->saved_regs[M88K_R1_REGNUM].addr - 4;
frame_sp = frame_unwind_register_unsigned (next_frame, M88K_R31_REGNUM);
}
/* Now that we know the stack pointer, adjust the location of the
saved registers. */
{
int regnum;
for (regnum = M88K_R0_REGNUM; regnum < M88K_R31_REGNUM; regnum ++)
if (cache->saved_regs[regnum].addr != -1)
cache->saved_regs[regnum].addr += frame_sp;
}
/* Calculate the frame's base. */
cache->base = frame_sp - cache->sp_offset;
trad_frame_set_value (cache->saved_regs, M88K_R31_REGNUM, cache->base);
/* Identify SXIP with the return address in R1. */
cache->saved_regs[M88K_SXIP_REGNUM] = cache->saved_regs[M88K_R1_REGNUM];
*this_cache = cache;
return cache;
}
static CORE_ADDR
m88k_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
{
struct symtab_and_line sal;
CORE_ADDR func_start, func_end;
/* This is the preferred method, find the end of the prologue by
using the debugging information. */
if (find_pc_partial_function (pc, NULL, &func_start, &func_end))
{
sal = find_pc_line (func_start, 0);
if (sal.end < func_end && pc <= sal.end)
return sal.end;
}
return m88k_analyze_prologue (pc, pc + m88k_max_prologue_size, NULL);
}
