From 343c3327c12b13655192983007de94bd44fd7941 Mon Sep 17 00:00:00 2001 From: Rashmica Gupta Date: Sat, 21 Nov 2015 17:08:16 +1100 Subject: [PATCH] powerpc: Add rN aliases to the pt_regs_offset table. It is common practice with powerpc to use 'rN' to refer to register 'N'. However when using the pt_regs_offset table we have to use 'gprN'. So add aliases such that both 'rN' and 'gprN' can be used. For example, we can currently do: $ su - $ cd /sys/kernel/debug/tracing $ echo "p:probe/sys_fchownat sys_fchownat %gpr3:s32 +0(%gpr4):string %gpr5:s32 %gpr6:s32 %gpr7:s32" > kprobe_events $ echo 1 > events/probe/sys_fchownat/enable $ touch /tmp/foo $ chown root /tmp/foo $ echo 0 > events/enable $ cat trace chown-2925 [014] d... 76.160657: sys_fchownat: (SyS_fchownat+0x8/0x1a0) arg1=-100 arg2="/tmp/foo" arg3=0 arg4=-1 arg5=0 Instead we'd like to be able to use: $ echo "p:probe/sys_fchownat sys_fchownat %r3:s32 +0(%r4):string %r5:s32 %r6:s32 %r7:s32" > kprobe_events Signed-off-by: Rashmica Gupta Signed-off-by: Michael Ellerman --- arch/powerpc/kernel/ptrace.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c index 737c0d0b53ac..30a03c03fe73 100644 --- a/arch/powerpc/kernel/ptrace.c +++ b/arch/powerpc/kernel/ptrace.c @@ -60,6 +60,7 @@ struct pt_regs_offset { #define STR(s) #s /* convert to string */ #define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)} #define GPR_OFFSET_NAME(num) \ + {.name = STR(r##num), .offset = offsetof(struct pt_regs, gpr[num])}, \ {.name = STR(gpr##num), .offset = offsetof(struct pt_regs, gpr[num])} #define REG_OFFSET_END {.name = NULL, .offset = 0} -- 2.20.1