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-rw-r--r--arch/mips/math-emu/cp1emu.c23
-rw-r--r--arch/mips/math-emu/dsemul.c38
-rw-r--r--arch/mips/math-emu/me-debugfs.c12
3 files changed, 36 insertions, 37 deletions
diff --git a/arch/mips/math-emu/cp1emu.c b/arch/mips/math-emu/cp1emu.c
index 62deb025970b..e60e29078ef5 100644
--- a/arch/mips/math-emu/cp1emu.c
+++ b/arch/mips/math-emu/cp1emu.c
@@ -1063,7 +1063,7 @@ emul:
MIPSInst_SIMM(ir));
MIPS_FPU_EMU_INC_STATS(loads);
- if (!access_ok(VERIFY_READ, dva, sizeof(u64))) {
+ if (!access_ok(dva, sizeof(u64))) {
MIPS_FPU_EMU_INC_STATS(errors);
*fault_addr = dva;
return SIGBUS;
@@ -1081,7 +1081,7 @@ emul:
MIPSInst_SIMM(ir));
MIPS_FPU_EMU_INC_STATS(stores);
DIFROMREG(dval, MIPSInst_RT(ir));
- if (!access_ok(VERIFY_WRITE, dva, sizeof(u64))) {
+ if (!access_ok(dva, sizeof(u64))) {
MIPS_FPU_EMU_INC_STATS(errors);
*fault_addr = dva;
return SIGBUS;
@@ -1097,7 +1097,7 @@ emul:
wva = (u32 __user *) (xcp->regs[MIPSInst_RS(ir)] +
MIPSInst_SIMM(ir));
MIPS_FPU_EMU_INC_STATS(loads);
- if (!access_ok(VERIFY_READ, wva, sizeof(u32))) {
+ if (!access_ok(wva, sizeof(u32))) {
MIPS_FPU_EMU_INC_STATS(errors);
*fault_addr = wva;
return SIGBUS;
@@ -1115,7 +1115,7 @@ emul:
MIPSInst_SIMM(ir));
MIPS_FPU_EMU_INC_STATS(stores);
SIFROMREG(wval, MIPSInst_RT(ir));
- if (!access_ok(VERIFY_WRITE, wva, sizeof(u32))) {
+ if (!access_ok(wva, sizeof(u32))) {
MIPS_FPU_EMU_INC_STATS(errors);
*fault_addr = wva;
return SIGBUS;
@@ -1493,7 +1493,7 @@ static int fpux_emu(struct pt_regs *xcp, struct mips_fpu_struct *ctx,
xcp->regs[MIPSInst_FT(ir)]);
MIPS_FPU_EMU_INC_STATS(loads);
- if (!access_ok(VERIFY_READ, va, sizeof(u32))) {
+ if (!access_ok(va, sizeof(u32))) {
MIPS_FPU_EMU_INC_STATS(errors);
*fault_addr = va;
return SIGBUS;
@@ -1513,7 +1513,7 @@ static int fpux_emu(struct pt_regs *xcp, struct mips_fpu_struct *ctx,
MIPS_FPU_EMU_INC_STATS(stores);
SIFROMREG(val, MIPSInst_FS(ir));
- if (!access_ok(VERIFY_WRITE, va, sizeof(u32))) {
+ if (!access_ok(va, sizeof(u32))) {
MIPS_FPU_EMU_INC_STATS(errors);
*fault_addr = va;
return SIGBUS;
@@ -1590,7 +1590,7 @@ static int fpux_emu(struct pt_regs *xcp, struct mips_fpu_struct *ctx,
xcp->regs[MIPSInst_FT(ir)]);
MIPS_FPU_EMU_INC_STATS(loads);
- if (!access_ok(VERIFY_READ, va, sizeof(u64))) {
+ if (!access_ok(va, sizeof(u64))) {
MIPS_FPU_EMU_INC_STATS(errors);
*fault_addr = va;
return SIGBUS;
@@ -1609,7 +1609,7 @@ static int fpux_emu(struct pt_regs *xcp, struct mips_fpu_struct *ctx,
MIPS_FPU_EMU_INC_STATS(stores);
DIFROMREG(val, MIPSInst_FS(ir));
- if (!access_ok(VERIFY_WRITE, va, sizeof(u64))) {
+ if (!access_ok(va, sizeof(u64))) {
MIPS_FPU_EMU_INC_STATS(errors);
*fault_addr = va;
return SIGBUS;
@@ -2831,6 +2831,13 @@ int fpu_emulator_cop1Handler(struct pt_regs *xcp, struct mips_fpu_struct *ctx,
u16 *instr_ptr;
int sig = 0;
+ /*
+ * Initialize context if it hasn't been used already, otherwise ensure
+ * it has been saved to struct thread_struct.
+ */
+ if (!init_fp_ctx(current))
+ lose_fpu(1);
+
oldepc = xcp->cp0_epc;
do {
prevepc = xcp->cp0_epc;
diff --git a/arch/mips/math-emu/dsemul.c b/arch/mips/math-emu/dsemul.c
index 5450f4d1c920..e2d46cb93ca9 100644
--- a/arch/mips/math-emu/dsemul.c
+++ b/arch/mips/math-emu/dsemul.c
@@ -214,8 +214,9 @@ int mips_dsemul(struct pt_regs *regs, mips_instruction ir,
{
int isa16 = get_isa16_mode(regs->cp0_epc);
mips_instruction break_math;
- struct emuframe __user *fr;
- int err, fr_idx;
+ unsigned long fr_uaddr;
+ struct emuframe fr;
+ int fr_idx, ret;
/* NOP is easy */
if (ir == 0)
@@ -250,27 +251,31 @@ int mips_dsemul(struct pt_regs *regs, mips_instruction ir,
fr_idx = alloc_emuframe();
if (fr_idx == BD_EMUFRAME_NONE)
return SIGBUS;
- fr = &dsemul_page()[fr_idx];
/* Retrieve the appropriately encoded break instruction */
break_math = BREAK_MATH(isa16);
/* Write the instructions to the frame */
if (isa16) {
- err = __put_user(ir >> 16,
- (u16 __user *)(&fr->emul));
- err |= __put_user(ir & 0xffff,
- (u16 __user *)((long)(&fr->emul) + 2));
- err |= __put_user(break_math >> 16,
- (u16 __user *)(&fr->badinst));
- err |= __put_user(break_math & 0xffff,
- (u16 __user *)((long)(&fr->badinst) + 2));
+ union mips_instruction _emul = {
+ .halfword = { ir >> 16, ir }
+ };
+ union mips_instruction _badinst = {
+ .halfword = { break_math >> 16, break_math }
+ };
+
+ fr.emul = _emul.word;
+ fr.badinst = _badinst.word;
} else {
- err = __put_user(ir, &fr->emul);
- err |= __put_user(break_math, &fr->badinst);
+ fr.emul = ir;
+ fr.badinst = break_math;
}
- if (unlikely(err)) {
+ /* Write the frame to user memory */
+ fr_uaddr = (unsigned long)&dsemul_page()[fr_idx];
+ ret = access_process_vm(current, fr_uaddr, &fr, sizeof(fr),
+ FOLL_FORCE | FOLL_WRITE);
+ if (unlikely(ret != sizeof(fr))) {
MIPS_FPU_EMU_INC_STATS(errors);
free_emuframe(fr_idx, current->mm);
return SIGBUS;
@@ -282,10 +287,7 @@ int mips_dsemul(struct pt_regs *regs, mips_instruction ir,
atomic_set(&current->thread.bd_emu_frame, fr_idx);
/* Change user register context to execute the frame */
- regs->cp0_epc = (unsigned long)&fr->emul | isa16;
-
- /* Ensure the icache observes our newly written frame */
- flush_cache_sigtramp((unsigned long)&fr->emul);
+ regs->cp0_epc = fr_uaddr | isa16;
return 0;
}
diff --git a/arch/mips/math-emu/me-debugfs.c b/arch/mips/math-emu/me-debugfs.c
index 62566385ce0e..58798f527356 100644
--- a/arch/mips/math-emu/me-debugfs.c
+++ b/arch/mips/math-emu/me-debugfs.c
@@ -183,17 +183,7 @@ static int fpuemustats_clear_show(struct seq_file *s, void *unused)
return 0;
}
-static int fpuemustats_clear_open(struct inode *inode, struct file *file)
-{
- return single_open(file, fpuemustats_clear_show, inode->i_private);
-}
-
-static const struct file_operations fpuemustats_clear_fops = {
- .open = fpuemustats_clear_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
-};
+DEFINE_SHOW_ATTRIBUTE(fpuemustats_clear);
static int __init debugfs_fpuemu(void)
{
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