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authorVineet Gupta <vgupta@synopsys.com>2013-05-28 09:43:17 +0530
committerVineet Gupta <vgupta@synopsys.com>2013-06-22 19:23:22 +0530
commit2fa919045b72ec892e17d56f888e6af4260b7629 (patch)
tree1f0f89110514c07939666d6b1f225b3e8dff6be3 /arch/arc/include/uapi
parent283237a04fd332bddc2ac298e6ad7d23a1fc4b99 (diff)
ARC: pt_regs update #2: Remove unused gutter at start of pt_regs
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc/include/uapi')
-rw-r--r--arch/arc/include/uapi/asm/ptrace.h11
1 files changed, 7 insertions, 4 deletions
diff --git a/arch/arc/include/uapi/asm/ptrace.h b/arch/arc/include/uapi/asm/ptrace.h
index 30333cec0fef..e0e8403f181f 100644
--- a/arch/arc/include/uapi/asm/ptrace.h
+++ b/arch/arc/include/uapi/asm/ptrace.h
@@ -20,16 +20,19 @@
*
* This is to decouple pt_regs from user-space ABI, to be able to change it
* w/o affecting the ABI.
- * Although the layout (initial padding) is similar to pt_regs to have some
- * optimizations when copying pt_regs to/from user_regs_struct.
+ *
+ * The intermediate pad,pad2 are relics of initial layout based on pt_regs
+ * for optimizations when copying pt_regs to/from user_regs_struct.
+ * We no longer need them, but can't be changed as they are part of ABI now.
*
* Also, sigcontext only care about the scratch regs as that is what we really
- * save/restore for signal handling.
+ * save/restore for signal handling. However gdb also uses the same struct
+ * hence callee regs need to be in there too.
*/
struct user_regs_struct {
+ long pad;
struct {
- long pad;
long bta, lp_start, lp_end, lp_count;
long status32, ret, blink, fp, gp;
long r12, r11, r10, r9, r8, r7, r6, r5, r4, r3, r2, r1, r0;