diff options
Diffstat (limited to 'arch/mips')
| -rw-r--r-- | arch/mips/kernel/vdso.c | 4 | ||||
| -rw-r--r-- | arch/mips/math-emu/dsemul.c | 38 |
2 files changed, 22 insertions, 20 deletions
diff --git a/arch/mips/kernel/vdso.c b/arch/mips/kernel/vdso.c index 48a9c6b90e07..9df3ebdc7b0f 100644 --- a/arch/mips/kernel/vdso.c +++ b/arch/mips/kernel/vdso.c @@ -126,8 +126,8 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp) /* Map delay slot emulation page */ base = mmap_region(NULL, STACK_TOP, PAGE_SIZE, - VM_READ|VM_WRITE|VM_EXEC| - VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC, + VM_READ | VM_EXEC | + VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC, 0, NULL); if (IS_ERR_VALUE(base)) { ret = base; 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(¤t->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; } |