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Merge branch '4.1-fp' into mips-for-linux-next

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This commit is contained in:
Ralf Baechle
2015-04-13 16:01:37 +02:00
parent 3cf2954341 1f3a2c6e22
commit 98b0429b7a
8 changed files with 208 additions and 205 deletions
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30
arch/mips/kernel/ptrace.c
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@@ -47,6 +47,26 @@
#define CREATE_TRACE_POINTS
#include <trace/events/syscalls.h>
static void init_fp_ctx(struct task_struct *target)
{
/* If FP has been used then the target already has context */
if (tsk_used_math(target))
return;
/* Begin with data registers set to all 1s... */
memset(&target->thread.fpu.fpr, ~0, sizeof(target->thread.fpu.fpr));
/* ...and FCSR zeroed */
target->thread.fpu.fcr31 = 0;
/*
* Record that the target has "used" math, such that the context
* just initialised, and any modifications made by the caller,
* aren't discarded.
*/
set_stopped_child_used_math(target);
}
/*
* Called by kernel/ptrace.c when detaching..
*
@@ -146,6 +166,7 @@ int ptrace_setfpregs(struct task_struct *child, __u32 __user *data)
if (!access_ok(VERIFY_READ, data, 33 * 8))
return -EIO;
init_fp_ctx(child);
fregs = get_fpu_regs(child);
for (i = 0; i < 32; i++) {
@@ -445,6 +466,8 @@ static int fpr_set(struct task_struct *target,
/* XXX fcr31 */
init_fp_ctx(target);
if (sizeof(target->thread.fpu.fpr[i]) == sizeof(elf_fpreg_t))
return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&target->thread.fpu,
@@ -666,12 +689,7 @@ long arch_ptrace(struct task_struct *child, long request,
case FPR_BASE ... FPR_BASE + 31: {
union fpureg *fregs = get_fpu_regs(child);
if (!tsk_used_math(child)) {
/* FP not yet used */
memset(&child->thread.fpu, ~0,
sizeof(child->thread.fpu));
child->thread.fpu.fcr31 = 0;
}
init_fp_ctx(child);
#ifdef CONFIG_32BIT
if (test_thread_flag(TIF_32BIT_FPREGS)) {
/*