AcoSail/kernel_optimize_test
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arm64: take fetching compat reg out of pt_regs into a new helper

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2020-05-15 11:22:26 -04:00
parent b3a9e3b962
commit a96dacf988
1 changed files with 17 additions and 17 deletions
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34
arch/arm64/kernel/ptrace.c
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@ -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));