lkml.org 
[lkml]   [2020]   [Jun]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 14/41] arm64: take fetching compat reg out of pt_regs into a new helper
Date
From: Al Viro <viro@zeniv.linux.org.uk>

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
arch/arm64/kernel/ptrace.c | 34 +++++++++++++++++-----------------
1 file changed, 17 insertions(+), 17 deletions(-)

diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c
index 68b7f34a08f5..5b837741ab76 100644
--- a/arch/arm64/kernel/ptrace.c
+++ b/arch/arm64/kernel/ptrace.c
@@ -1237,6 +1237,22 @@ enum compat_regset {
REGSET_COMPAT_VFP,
};

+static inline compat_ulong_t compat_get_user_reg(struct task_struct *task, int idx)
+{
+ struct pt_regs *regs = task_pt_regs(task);
+
+ switch (idx) {
+ case 15:
+ return regs->pc;
+ case 16:
+ return pstate_to_compat_psr(regs->pstate);
+ case 17:
+ return regs->orig_x0;
+ default:
+ return regs->regs[idx];
+ }
+}
+
static int compat_gpr_get(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
@@ -1255,23 +1271,7 @@ static int compat_gpr_get(struct task_struct *target,
return -EIO;

for (i = 0; i < num_regs; ++i) {
- unsigned int idx = start + i;
- compat_ulong_t reg;
-
- switch (idx) {
- case 15:
- reg = task_pt_regs(target)->pc;
- break;
- case 16:
- reg = task_pt_regs(target)->pstate;
- reg = pstate_to_compat_psr(reg);
- break;
- case 17:
- reg = task_pt_regs(target)->orig_x0;
- break;
- default:
- reg = task_pt_regs(target)->regs[idx];
- }
+ compat_ulong_t reg = compat_get_user_reg(target, start + i);

if (kbuf) {
memcpy(kbuf, &reg, sizeof(reg));
--
2.11.0
\
 
 \ /
  Last update: 2020-06-29 20:44    [W:0.241 / U:12.264 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site