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* s390-tdep.c (s390_get_frame_info): Recognize argument register

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spills that use the `stm' instruction.
(is_arg_reg): New function.
This commit is contained in:
Jim Blandy
2001-12-05 22:20:00 +00:00
parent f2eab0af2b
commit 12bffad7cc
2 changed files with 23 additions and 4 deletions
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6
gdb/ChangeLog
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@@ -1,3 +1,9 @@
2001-12-05 Jim Blandy <jimb@redhat.com>
* s390-tdep.c (s390_get_frame_info): Recognize argument register
spills that use the `stm' instruction.
(is_arg_reg): New function.
2001-12-03 Keith Walker <keith.walker@arm.com>
* gdbserver/low-linux.c (arm_register_u_addr): added.
(initialize_arch): added for ARM target.

21
gdb/s390-tdep.c
View File

@@ -180,6 +180,14 @@ s390_stab_reg_to_regnum (int regno)
}
/* 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
@@ -405,7 +413,7 @@ s390_get_frame_info (CORE_ADDR pc, struct frame_extra_info *fextra_info,
continue;
}
/* Check for an fp-relative STG or ST. This is probably
/* 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
@@ -414,9 +422,14 @@ s390_get_frame_info (CORE_ADDR pc, struct frame_extra_info *fextra_info,
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 */
&& ((instr[2] >> 4) & 0xf) == frame_pointer_regidx)
&& ((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;