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| author | Jose E. Marchesi <jose.marchesi@oracle.com> | 2013-11-18 04:37:05 -0800 |
|---|---|---|
| committer | Jose E. Marchesi <jose.marchesi@oracle.com> | 2013-11-18 04:37:05 -0800 |
| commit | d0b5971ae7b8709c28a7a1638413426d8749d976 (patch) | |
| tree | ed6837627bce0dc681f157afa2651fe563b02de4 /gdb/sparc-tdep.c | |
| parent | 4b4589ada7e88f2f36d264a173d95ed5994b3acb (diff) | |
| download | gdb-d0b5971ae7b8709c28a7a1638413426d8749d976.zip gdb-d0b5971ae7b8709c28a7a1638413426d8749d976.tar.gz gdb-d0b5971ae7b8709c28a7a1638413426d8749d976.tar.bz2 | |
sparc: support single-stepping over longjmp calls.
2013-11-18 Jose E. Marchesi <jose.marchesi@oracle.com>
* sparc-tdep.c (sparc_is_annulled_branch_insn): New function.
* sparc-tdep.h: And its prototype.
* sparc64-linux-tdep.c (sparc64_linux_get_longjmp_target): New
function.
(sparc64_linux_init_abi): Register the get_longjmp_target hook.
Diffstat (limited to 'gdb/sparc-tdep.c')
| -rw-r--r-- | gdb/sparc-tdep.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/gdb/sparc-tdep.c b/gdb/sparc-tdep.c index 53014a0..1a200e0 100644 --- a/gdb/sparc-tdep.c +++ b/gdb/sparc-tdep.c @@ -121,6 +121,37 @@ sparc_is_unimp_insn (CORE_ADDR pc) return ((insn & 0xc1c00000) == 0); } +/* Return non-zero if the instruction corresponding to PC is an + "annulled" branch, i.e. the annul bit is set. */ + +int +sparc_is_annulled_branch_insn (CORE_ADDR pc) +{ + /* The branch instructions featuring an annul bit can be identified + by the following bit patterns: + + OP=0 + OP2=1: Branch on Integer Condition Codes with Prediction (BPcc). + OP2=2: Branch on Integer Condition Codes (Bcc). + OP2=5: Branch on FP Condition Codes with Prediction (FBfcc). + OP2=6: Branch on FP Condition Codes (FBcc). + OP2=3 && Bit28=0: + Branch on Integer Register with Prediction (BPr). + + This leaves out ILLTRAP (OP2=0), SETHI/NOP (OP2=4) and the V8 + coprocessor branch instructions (Op2=7). */ + + const unsigned long insn = sparc_fetch_instruction (pc); + const unsigned op2 = X_OP2 (insn); + + if ((X_OP (insn) == 0) + && ((op2 == 1) || (op2 == 2) || (op2 == 5) || (op2 == 6) + || ((op2 == 3) && ((insn & 0x10000000) == 0)))) + return X_A (insn); + else + return 0; +} + /* OpenBSD/sparc includes StackGhost, which according to the author's website http://stackghost.cerias.purdue.edu "... transparently and automatically protects applications' stack frames; more |