+ {
+ /* 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)
projects / binutils.git / blobdiff