diff options
| author | Vineet Gupta <vgupta@synopsys.com> | 2013-06-22 12:38:59 +0530 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2013-06-22 19:23:26 +0530 |
| commit | 352c1d95e3220d0ea33cefac5c1f0deb2c4470c6 (patch) | |
| tree | 2e487e17b6c45610ae819e01be6a7a0f534c35e8 /arch/arc/include/uapi/asm | |
| parent | 359105bdb06f8421fd8e69ae47fd052e398b6778 (diff) | |
| download | lwn-352c1d95e3220d0ea33cefac5c1f0deb2c4470c6.tar.gz lwn-352c1d95e3220d0ea33cefac5c1f0deb2c4470c6.zip | |
ARC: stop using pt_regs->orig_r8
Historically, pt_regs have had orig_r8, an overloaded container for
(1) backup copy of r8 (syscall number Trap Exceptions)
(2) additional system state: (syscall/Exception/Interrupt)
There is no point in keeping (1) since syscall number is never clobbered
in-place, in pt_regs, unlike r0 which duals as first syscall arg as well
as syscall return value and in case of syscall restart, the orig arg0
needs restoring (from orig_r0) after having been updated in-place with
syscall ret value.
This further paves way to convert (2) to contain ECR itself (rather than
current madeup values)
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc/include/uapi/asm')
| -rw-r--r-- | arch/arc/include/uapi/asm/ptrace.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arc/include/uapi/asm/ptrace.h b/arch/arc/include/uapi/asm/ptrace.h index 4599109f68f2..2618cc13ba75 100644 --- a/arch/arc/include/uapi/asm/ptrace.h +++ b/arch/arc/include/uapi/asm/ptrace.h @@ -44,7 +44,7 @@ struct user_regs_struct { long r19, r18, r17, r16, r15, r14, r13; } callee; long efa; /* break pt addr, for break points in delay slots */ - long stop_pc; /* give dbg stop_pc directly after checking orig_r8 */ + long stop_pc; /* give dbg stop_pc after ensuring brkpt trap */ }; #endif /* !__ASSEMBLY__ */ |