}
+/* Return true if REGIDX is the number of a register used to pass
+ arguments, false otherwise. */
+static int
+is_arg_reg (int regidx)
+{
+ return 2 <= regidx && regidx <= 6;
+}
+
/* s390_get_frame_info based on Hartmuts
prologue definition in
int gprs_saved[S390_NUM_GPRS];
int fprs_saved[S390_NUM_FPRS];
int regidx, instrlen;
- int save_link_regidx, subtract_sp_regidx;
- int const_pool_state, save_link_state;
- int frame_pointer_found, varargs_state;
+ int const_pool_state;
+ int varargs_state;
int loop_cnt, gdb_gpr_store, gdb_fpr_store;
- int frame_pointer_regidx = 0xf;
int offset, expected_offset;
int err = 0;
disassemble_info info;
+ /* Have we seen an instruction initializing the frame pointer yet?
+ If we've seen an `lr %r11, %r15', then frame_pointer_found is
+ non-zero, and frame_pointer_regidx == 11. Otherwise,
+ frame_pointer_found is zero and frame_pointer_regidx is 15,
+ indicating that we're using the stack pointer as our frame
+ pointer. */
+ int frame_pointer_found = 0;
+ int frame_pointer_regidx = 0xf;
+
+ /* What we've seen so far regarding saving the back chain link:
+ 0 -- nothing yet; sp still has the same value it had at the entry
+ point. Since not all functions allocate frames, this is a
+ valid state for the prologue to finish in.
+ 1 -- We've saved the original sp in some register other than the
+ frame pointer (hard-coded to be %r11, yuck).
+ save_link_regidx is the register we saved it in.
+ 2 -- We've seen the initial `bras' instruction of the sequence for
+ reserving more than 32k of stack:
+ bras %rX, .+8
+ .long N
+ s %r15, 0(%rX)
+ where %rX is not the constant pool register.
+ subtract_sp_regidx is %rX, and fextra_info->stack_bought is N.
+ 3 -- We've reserved space for a new stack frame. This means we
+ either saw a simple `ahi %r15,-N' in state 1, or the final
+ `s %r15, ...' in state 2.
+ 4 -- The frame and link are now fully initialized. We've
+ reserved space for the new stack frame, and stored the old
+ stack pointer captured in the back chain pointer field. */
+ int save_link_state = 0;
+ int save_link_regidx, subtract_sp_regidx;
+
/* What we've seen so far regarding r12 --- the GOT (Global Offset
Table) pointer. We expect to see `l %r12, N(%r13)', which loads
r12 with the offset from the constant pool to the GOT, and then
When got_state is 1, then got_load_addr is the address of the
load instruction, and got_load_len is the length of that
instruction. */
- int got_state;
+ int got_state= 0;
CORE_ADDR got_load_addr = 0, got_load_len = 0;
- const_pool_state = save_link_state = got_state = varargs_state = 0;
- frame_pointer_found = 0;
+ const_pool_state = varargs_state = 0;
+
memset (gprs_saved, 0, sizeof (gprs_saved));
memset (fprs_saved, 0, sizeof (fprs_saved));
info.read_memory_func = dis_asm_read_memory;
continue;
}
+ /* Check for an fp-relative STG, ST, or STM. This is probably
+ spilling an argument from a register out into a stack slot.
+ This could be a user instruction, but if we haven't included
+ any other suspicious instructions in the prologue, this
+ could only be an initializing store, which isn't too bad to
+ skip. The consequences of not including arg-to-stack spills
+ are more serious, though --- you don't see the proper values
+ of the arguments. */
+ if ((save_link_state == 3 || save_link_state == 4)
+ && ((instr[0] == 0x50 /* st %rA, D(%rX,%rB) */
+ && (instr[1] & 0xf) == 0 /* %rX is zero, no index reg */
+ && is_arg_reg ((instr[1] >> 4) & 0xf)
+ && ((instr[2] >> 4) & 0xf) == frame_pointer_regidx)
+ || (instr[0] == 0x90 /* stm %rA, %rB, D(%rC) */
+ && is_arg_reg ((instr[1] >> 4) & 0xf)
+ && is_arg_reg (instr[1] & 0xf)
+ && ((instr[2] >> 4) & 0xf) == frame_pointer_regidx)))
+ {
+ valid_prologue = 1;
+ continue;
+ }
+
/* check for STD */
if (instr[0] == 0x60 && (instr[2] >> 4) == 0xf)
{
/* Alternatively check for the complex construction for
buying more than 32k of stack
BRAS gprx,.+8
- long vals %r15,0(%gprx) gprx currently r1 */
+ long val
+ s %r15,0(%gprx) gprx currently r1 */
if ((save_link_state == 1) && (instr[0] == 0xa7)
&& ((instr[1] & 0xf) == 0x5) && (instr[2] == 0)
&& (instr[3] == 0x4) && ((instr[1] >> 4) != CONST_POOL_REGIDX))
if (TYPE_CODE (valtype) == TYPE_CODE_FLT)
{
- DOUBLEST tempfloat = extract_floating (valbuf, TYPE_LENGTH (valtype));
-
- floatformat_from_doublest (&floatformat_ieee_double_big, &tempfloat,
- reg_buff);
- write_register_bytes (REGISTER_BYTE (S390_FP0_REGNUM), reg_buff,
- S390_FPR_SIZE);
+ if (TYPE_LENGTH (valtype) == 4
+ || TYPE_LENGTH (valtype) == 8)
+ write_register_bytes (REGISTER_BYTE (S390_FP0_REGNUM), valbuf,
+ TYPE_LENGTH (valtype));
+ else
+ error ("GDB is unable to return `long double' values "
+ "on this architecture.");
}
else
{
projects / deliverable / binutils-gdb.git / blobdiff