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>

diff --git a/arch/loongarch/kernel/ptrace.c b/arch/loongarch/kernel/ptrace.c
index e6ab87948e1d3e4d975da6e54db0be18f96a0bb8..dc2b82ea894cd26c1c3d662e488145d82d1fba0d 100644 (file)
--- 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;
 }