From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-x22e.google.com (mail-pa0-x22e.google.com [IPv6:2607:f8b0:400e:c03::22e]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id D5FED1A0007 for ; Sat, 21 Nov 2015 17:08:38 +1100 (AEDT) Received: by pacdm15 with SMTP id dm15so137460966pac.3 for ; Fri, 20 Nov 2015 22:08:35 -0800 (PST) Received: from circle.ozlabs.ibm.com ([122.99.82.10]) by smtp.gmail.com with ESMTPSA id by6sm1994935pab.25.2015.11.20.22.08.33 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 20 Nov 2015 22:08:34 -0800 (PST) From: Rashmica Gupta To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH] powerpc: Add rN aliases to the pt_regs_offset table. Date: Sat, 21 Nov 2015 17:08:16 +1100 Message-Id: <1448086096-3117-1-git-send-email-rashmicy@gmail.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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 - $ echo "p:probe/sys_fchownat .sys_fchownat %gpr3:s32 +0(%gpr4):string %gpr5:s32 %gpr6:s32 %gpr7:s32" > /sys/kernel/debug/tracing/kprobe_events $ echo 1 > /sys/kernel/debug/tracing/events/probe/sys_fchownat/enable $ touch /tmp/foo $ chown root /tmp/foo $ echo 0 > /sys/kernel/debug/tracing/events/enable $ cat /sys/kernel/debug/tracing/trace chown-5040 [001] d... 24800.047211: sys_fchownat: (.SyS_fchownat+0x0/0x190) arg1=-100 arg2="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" > /sys/kernel/debug/tracing/kprobe_events Signed-off-by: Rashmica Gupta --- 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} -- 2.5.0