diff options
Diffstat (limited to 'arch/x86/math-emu')
| -rw-r--r-- | arch/x86/math-emu/fpu_entry.c | 86 |
1 files changed, 54 insertions, 32 deletions
diff --git a/arch/x86/math-emu/fpu_entry.c b/arch/x86/math-emu/fpu_entry.c index 377c60dfa2f0..cfbdaa1532ce 100644 --- a/arch/x86/math-emu/fpu_entry.c +++ b/arch/x86/math-emu/fpu_entry.c @@ -25,10 +25,11 @@ +---------------------------------------------------------------------------*/ #include <linux/signal.h> -#include <linux/ptrace.h> +#include <linux/regset.h> #include <asm/uaccess.h> #include <asm/desc.h> +#include <asm/user.h> #include "fpu_system.h" #include "fpu_emu.h" @@ -198,9 +199,7 @@ asmlinkage void math_emulate(long arg) code_limit = 0xffffffff; } - FPU_lookahead = 1; - if (current->ptrace & PT_PTRACED) - FPU_lookahead = 0; + FPU_lookahead = !(FPU_EFLAGS & X86_EFLAGS_TF); if (!valid_prefix(&byte1, (u_char __user **) & FPU_EIP, &addr_modes.override)) { @@ -673,31 +672,37 @@ void math_abort(struct info *info, unsigned int signal) #define sstatus_word() \ ((S387->swd & ~SW_Top & 0xffff) | ((S387->ftop << SW_Top_Shift) & SW_Top)) -int restore_i387_soft(void *s387, struct _fpstate __user *buf) +int fpregs_soft_set(struct task_struct *target, + const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf) { - u_char __user *d = (u_char __user *) buf; + struct i387_soft_struct *s387 = &target->thread.i387.soft; + void *space = s387->st_space; + int ret; int offset, other, i, tags, regnr, tag, newtop; RE_ENTRANT_CHECK_OFF; - FPU_access_ok(VERIFY_READ, d, 7 * 4 + 8 * 10); - if (__copy_from_user(&S387->cwd, d, 7 * 4)) - return -1; + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, s387, 0, + offsetof(struct i387_soft_struct, st_space)); RE_ENTRANT_CHECK_ON; - d += 7 * 4; + if (ret) + return ret; S387->ftop = (S387->swd >> SW_Top_Shift) & 7; offset = (S387->ftop & 7) * 10; other = 80 - offset; RE_ENTRANT_CHECK_OFF; + /* Copy all registers in stack order. */ - if (__copy_from_user(((u_char *) & S387->st_space) + offset, d, other)) - return -1; - if (offset) - if (__copy_from_user - ((u_char *) & S387->st_space, d + other, offset)) - return -1; + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, + space + offset, 0, other); + if (!ret && offset) + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, + space, 0, offset); + RE_ENTRANT_CHECK_ON; /* The tags may need to be corrected now. */ @@ -716,16 +721,21 @@ int restore_i387_soft(void *s387, struct _fpstate __user *buf) } S387->twd = tags; - return 0; + return ret; } -int save_i387_soft(void *s387, struct _fpstate __user * buf) +int fpregs_soft_get(struct task_struct *target, + const struct user_regset *regset, + unsigned int pos, unsigned int count, + void *kbuf, void __user *ubuf) { - u_char __user *d = (u_char __user *) buf; + struct i387_soft_struct *s387 = &target->thread.i387.soft; + const void *space = s387->st_space; + int ret; int offset = (S387->ftop & 7) * 10, other = 80 - offset; RE_ENTRANT_CHECK_OFF; - FPU_access_ok(VERIFY_WRITE, d, 7 * 4 + 8 * 10); + #ifdef PECULIAR_486 S387->cwd &= ~0xe080; /* An 80486 sets nearly all of the reserved bits to 1. */ @@ -735,21 +745,33 @@ int save_i387_soft(void *s387, struct _fpstate __user * buf) S387->fcs &= ~0xf8000000; S387->fos |= 0xffff0000; #endif /* PECULIAR_486 */ - if (__copy_to_user(d, &S387->cwd, 7 * 4)) - return -1; - RE_ENTRANT_CHECK_ON; - d += 7 * 4; + ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, s387, 0, + offsetof(struct i387_soft_struct, st_space)); - RE_ENTRANT_CHECK_OFF; /* Copy all registers in stack order. */ - if (__copy_to_user(d, ((u_char *) & S387->st_space) + offset, other)) - return -1; - if (offset) - if (__copy_to_user - (d + other, (u_char *) & S387->st_space, offset)) - return -1; + if (!ret) + ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, + space + offset, 0, other); + if (!ret) + ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, + space, 0, offset); + RE_ENTRANT_CHECK_ON; - return 1; + return ret; +} + +int save_i387_soft(void *s387, struct _fpstate __user *buf) +{ + return fpregs_soft_get(current, NULL, + 0, sizeof(struct user_i387_struct), + NULL, buf) ? -1 : 1; +} + +int restore_i387_soft(void *s387, struct _fpstate __user *buf) +{ + return fpregs_soft_set(current, NULL, + 0, sizeof(struct user_i387_struct), + NULL, buf) ? -1 : 1; } |