diff options
| -rw-r--r-- | gdb/ChangeLog | 5 | ||||
| -rw-r--r-- | gdb/mep-tdep.c | 17 |
2 files changed, 22 insertions, 0 deletions
diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 75fee36..de167a6 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,8 @@ +2007-07-12 Kevin Buettner <kevinb@redhat.com> + + * mep-tdep.c (IS_BRA, BRA_DISP): New macros. + (mep_analyze_prologue): Add case for BRA instruction. + 2007-07-12 Ulrich Weigand <uweigand@de.ibm.com> * solib-svr4.c (LM_ADDR_CHECK): Relax prelink recognition heuristic. diff --git a/gdb/mep-tdep.c b/gdb/mep-tdep.c index b42b02c..5d60437 100644 --- a/gdb/mep-tdep.c +++ b/gdb/mep-tdep.c @@ -1578,6 +1578,10 @@ mep_get_insn (CORE_ADDR pc, long *insn) #define MOV_TARGET(i) (FIELD (i, 24, 4)) #define MOV_SOURCE(i) (FIELD (i, 20, 4)) +/* BRA disp12.align2 1011_dddd_dddd_ddd0 xxxx_xxxx_xxxx_xxxx */ +#define IS_BRA(i) (((i) & 0xf0010000) == 0xb0000000) +#define BRA_DISP(i) (SFIELD (i, 17, 11) << 1) + /* This structure holds the results of a prologue analysis. */ struct mep_prologue @@ -1806,6 +1810,19 @@ mep_analyze_prologue (CORE_ADDR start_pc, CORE_ADDR limit_pc, reg[rn] = pv_area_fetch (stack, addr, 4); } + else if (IS_BRA (insn) && BRA_DISP (insn) > 0) + { + /* When a loop appears as the first statement as a function + body, gcc 4.x will use a BRA instruction to branch to the + loop condition checking code. This BRA instruction is + marked as part of the prologue. We therefore set next_pc + to this branch target and also stop the prologue scan. + The instructions at and beyond the branch target should + no longer be associated with the prologue. */ + next_pc = pc + BRA_DISP (insn); + after_last_frame_setup_insn = next_pc; + break; + } else /* We've hit some instruction we don't know how to simulate. Strictly speaking, we should set every value we're |