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* s390-tdep.c (s390_get_frame_info): If the prologue loads r12

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from the constant pool, but doesn't add in the constant pool's
address to it, then this function probably isn't using r12 as a
GOT pointer, and that load probably wasn't part of the prologue.
This commit is contained in:
Jim Blandy 2001-11-08 19:06:04 +00:00
parent 4c801202fe
commit 8ac0e65a44
2 changed files with 38 additions and 4 deletions
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5
gdb/ChangeLog
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@ -1,5 +1,10 @@
2001-11-08 Jim Blandy <jimb@redhat.com>
* s390-tdep.c (s390_get_frame_info): If the prologue loads r12
from the constant pool, but doesn't add in the constant pool's
address to it, then this function probably isn't using r12 as a
GOT pointer, and that load probably wasn't part of the prologue.
* s390-tdep.c (s390_gdbarch_init): Use the default
prepare_to_proceed function established by config/nm-linux.h;
don't try to set it to linuxthreads_prepare_to_proceed.

37
gdb/s390-tdep.c
View file

@ -209,13 +209,28 @@ s390_get_frame_info (CORE_ADDR pc, struct frame_extra_info *fextra_info,
int fprs_saved[S390_NUM_FPRS];
int regidx, instrlen;
int save_link_regidx, subtract_sp_regidx;
int const_pool_state, save_link_state, got_state;
int const_pool_state, save_link_state;
int frame_pointer_found, 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;
/* 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
an `ar %r12, %r13', which adds the constant pool address,
yielding the GOT's address. Here's what got_state means:
0 -- seen nothing
1 -- seen `l %r12, N(%r13)', but no `ar'
2 -- seen load and add, so GOT pointer is totally initialized
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;
CORE_ADDR got_load_addr, got_load_len;
const_pool_state = save_link_state = got_state = varargs_state = 0;
frame_pointer_found = 0;
memset (gprs_saved, 0, sizeof (gprs_saved));
@ -539,7 +554,9 @@ s390_get_frame_info (CORE_ADDR pc, struct frame_extra_info *fextra_info,
&& (instr[2] == (CONST_POOL_REGIDX << 4))
&& ((instr[1] >> 4) == GOT_REGIDX))
{
got_state == 1;
got_state = 1;
got_load_addr = test_pc;
got_load_len = instrlen;
valid_prologue = 1;
continue;
}
@ -556,8 +573,20 @@ s390_get_frame_info (CORE_ADDR pc, struct frame_extra_info *fextra_info,
while (valid_prologue && good_prologue);
if (good_prologue)
{
good_prologue = (((got_state == 0) || (got_state == 2)) &&
((const_pool_state == 0) || (const_pool_state == 2)) &&
/* If this function doesn't reference the global offset table,
then the compiler may use r12 for other things. If the last
instruction we saw was a load of r12 from the constant pool,
with no subsequent add to make the address PC-relative, then
the load was probably a genuine body instruction; don't treat
it as part of the prologue. */
if (got_state == 1
&& got_load_addr + got_load_len == test_pc)
{
test_pc = got_load_addr;
instrlen = got_load_len;
}
good_prologue = (((const_pool_state == 0) || (const_pool_state == 2)) &&
((save_link_state == 0) || (save_link_state == 4)) &&
((varargs_state == 0) || (varargs_state == 2)));
}