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* s390-tdep.c (s390_get_frame_info): Doc fixes.

This commit is contained in:
Jim Blandy 2001-12-04 23:51:55 +00:00
parent 1ea5c32521
commit 6df29de21e
2 changed files with 30 additions and 3 deletions
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4
gdb/ChangeLog
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@ -1,3 +1,7 @@
2001-12-04 Jim Blandy <jimb@redhat.com>
* s390-tdep.c (s390_get_frame_info): Doc fixes.
2001-12-04 Orjan Friberg <orjanf@axis.com>
* cris-tdep.c (cris_regnums): Add DCCR_REGNUM for completeness.

29
gdb/s390-tdep.c
View File

@ -208,8 +208,7 @@ s390_get_frame_info (CORE_ADDR pc, struct frame_extra_info *fextra_info,
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 const_pool_state;
int frame_pointer_found, varargs_state;
int loop_cnt, gdb_gpr_store, gdb_fpr_store;
int frame_pointer_regidx = 0xf;
@ -217,6 +216,29 @@ s390_get_frame_info (CORE_ADDR pc, struct frame_extra_info *fextra_info,
int err = 0;
disassemble_info info;
/* 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;
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
@ -493,7 +515,8 @@ s390_get_frame_info (CORE_ADDR pc, struct frame_extra_info *fextra_info,
/* 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))