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authorQi Hu <huqi@loongson.cn>2022-07-14 14:25:50 +0800
committerHuacai Chen <chenhuacai@loongson.cn>2022-07-29 18:22:33 +0800
commitb0f3bdc00240fc9d7bf0f2a076943122d168c95e (patch)
tree44e91945af7f64a47da280d48449fae1873ee093 /arch
parent1aea29d7c3569e5b6c40e73c51e9f4b2142c96ef (diff)
LoongArch: Fix missing fcsr in ptrace's fpr_set
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/loongarch/kernel/ptrace.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/arch/loongarch/kernel/ptrace.c b/arch/loongarch/kernel/ptrace.c
index e6ab87948e1d..dc2b82ea894c 100644
--- a/arch/loongarch/kernel/ptrace.c
+++ b/arch/loongarch/kernel/ptrace.c
@@ -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;
}

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