linux-kernel - [PATCH -tip v3 07/11] ia64: Add instruction_pointer

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Date:   Fri, 19 Mar 2021 21:23:01 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...nel.org>
Cc:     X86 ML <x86@...nel.org>, Masami Hiramatsu <mhiramat@...nel.org>,
        Daniel Xu <dxu@...uu.xyz>, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org, kuba@...nel.org, mingo@...hat.com,
        ast@...nel.org, tglx@...utronix.de, kernel-team@...com, yhs@...com,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        linux-ia64@...r.kernel.org
Subject: [PATCH -tip v3 07/11] ia64: Add instruction_pointer_set() API

Add instruction_pointer_set() API for ia64.

Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
---
 arch/ia64/include/asm/ptrace.h |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/arch/ia64/include/asm/ptrace.h b/arch/ia64/include/asm/ptrace.h
index b3aa46090101..e382f1a6bff3 100644
--- a/arch/ia64/include/asm/ptrace.h
+++ b/arch/ia64/include/asm/ptrace.h
@@ -45,6 +45,7 @@
 #include <asm/current.h>
 #include <asm/page.h>
 
+# define ia64_psr(regs)			((struct ia64_psr *) &(regs)->cr_ipsr)
 /*
  * We use the ia64_psr(regs)->ri to determine which of the three
  * instructions in bundle (16 bytes) took the sample. Generate
@@ -71,6 +72,12 @@ static inline long regs_return_value(struct pt_regs *regs)
 		return -regs->r8;
 }
 
+static inline void instruction_pointer_set(struct pt_regs *regs, unsigned long val)
+{
+	ia64_psr(regs)->ri = (val & 0xf);
+	regs->cr_iip = (val & ~0xfULL);
+}
+
 /* Conserve space in histogram by encoding slot bits in address
  * bits 2 and 3 rather than bits 0 and 1.
  */
@@ -87,7 +94,6 @@ static inline long regs_return_value(struct pt_regs *regs)
 
   /* given a pointer to a task_struct, return the user's pt_regs */
 # define task_pt_regs(t)		(((struct pt_regs *) ((char *) (t) + IA64_STK_OFFSET)) - 1)
-# define ia64_psr(regs)			((struct ia64_psr *) &(regs)->cr_ipsr)
 # define user_mode(regs)		(((struct ia64_psr *) &(regs)->cr_ipsr)->cpl != 0)
 # define user_stack(task,regs)	((long) regs - (long) task == IA64_STK_OFFSET - sizeof(*regs))
 # define fsys_mode(task,regs)					\