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LoongArch: Fix missing fcsr in ptrace's fpr_set

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In file ptrace.c, function fpr_set does not copy fcsr data from ubuf
to kbuf. That's the reason why fcsr cannot be modified by ptrace.

This patch fixs this problem and allows users using ptrace to modify
the fcsr.

Co-developed-by: Xu Li <lixu@loongson.cn>
Signed-off-by: Qi Hu <huqi@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Qi Hu 2022-07-14 14:25:50 +08:00 committed by Huacai Chen
parent 1aea29d7c3
commit b0f3bdc002
1 changed files with 7 additions and 5 deletions
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12
arch/loongarch/kernel/ptrace.c
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@ -193,7 +193,7 @@ static int fpr_set(struct task_struct *target,
const void *kbuf, const void __user *ubuf)
{
const int fcc_start = NUM_FPU_REGS * sizeof(elf_fpreg_t);
const int fcc_end = fcc_start + sizeof(u64);
const int fcsr_start = fcc_start + sizeof(u64);
int err;
BUG_ON(count % sizeof(elf_fpreg_t));
@ -209,10 +209,12 @@ static int fpr_set(struct task_struct *target,
if (err)
return err;
if (count > 0)
err |= user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&target->thread.fpu.fcc,
fcc_start, fcc_end);
err |= user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&target->thread.fpu.fcc, fcc_start,
fcc_start + sizeof(u64));
err |= user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&target->thread.fpu.fcsr, fcsr_start,
fcsr_start + sizeof(u32));
return err;
}