diff options
Diffstat (limited to 'arch/i386/math-emu/fpu_system.h')
| -rw-r--r-- | arch/i386/math-emu/fpu_system.h | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/arch/i386/math-emu/fpu_system.h b/arch/i386/math-emu/fpu_system.h new file mode 100644 index 000000000000..bf26341c8bde --- /dev/null +++ b/arch/i386/math-emu/fpu_system.h @@ -0,0 +1,89 @@ +/*---------------------------------------------------------------------------+ + | fpu_system.h | + | | + | Copyright (C) 1992,1994,1997 | + | W. Metzenthen, 22 Parker St, Ormond, Vic 3163, | + | Australia. E-mail billm@suburbia.net | + | | + +---------------------------------------------------------------------------*/ + +#ifndef _FPU_SYSTEM_H +#define _FPU_SYSTEM_H + +/* system dependent definitions */ + +#include <linux/sched.h> +#include <linux/kernel.h> +#include <linux/mm.h> + +/* This sets the pointer FPU_info to point to the argument part + of the stack frame of math_emulate() */ +#define SETUP_DATA_AREA(arg) FPU_info = (struct info *) &arg + +/* s is always from a cpu register, and the cpu does bounds checking + * during register load --> no further bounds checks needed */ +#define LDT_DESCRIPTOR(s) (((struct desc_struct *)current->mm->context.ldt)[(s) >> 3]) +#define SEG_D_SIZE(x) ((x).b & (3 << 21)) +#define SEG_G_BIT(x) ((x).b & (1 << 23)) +#define SEG_GRANULARITY(x) (((x).b & (1 << 23)) ? 4096 : 1) +#define SEG_286_MODE(x) ((x).b & ( 0xff000000 | 0xf0000 | (1 << 23))) +#define SEG_BASE_ADDR(s) (((s).b & 0xff000000) \ + | (((s).b & 0xff) << 16) | ((s).a >> 16)) +#define SEG_LIMIT(s) (((s).b & 0xff0000) | ((s).a & 0xffff)) +#define SEG_EXECUTE_ONLY(s) (((s).b & ((1 << 11) | (1 << 9))) == (1 << 11)) +#define SEG_WRITE_PERM(s) (((s).b & ((1 << 11) | (1 << 9))) == (1 << 9)) +#define SEG_EXPAND_DOWN(s) (((s).b & ((1 << 11) | (1 << 10))) \ + == (1 << 10)) + +#define I387 (current->thread.i387) +#define FPU_info (I387.soft.info) + +#define FPU_CS (*(unsigned short *) &(FPU_info->___cs)) +#define FPU_SS (*(unsigned short *) &(FPU_info->___ss)) +#define FPU_DS (*(unsigned short *) &(FPU_info->___ds)) +#define FPU_EAX (FPU_info->___eax) +#define FPU_EFLAGS (FPU_info->___eflags) +#define FPU_EIP (FPU_info->___eip) +#define FPU_ORIG_EIP (FPU_info->___orig_eip) + +#define FPU_lookahead (I387.soft.lookahead) + +/* nz if ip_offset and cs_selector are not to be set for the current + instruction. */ +#define no_ip_update (*(u_char *)&(I387.soft.no_update)) +#define FPU_rm (*(u_char *)&(I387.soft.rm)) + +/* Number of bytes of data which can be legally accessed by the current + instruction. This only needs to hold a number <= 108, so a byte will do. */ +#define access_limit (*(u_char *)&(I387.soft.alimit)) + +#define partial_status (I387.soft.swd) +#define control_word (I387.soft.cwd) +#define fpu_tag_word (I387.soft.twd) +#define registers (I387.soft.st_space) +#define top (I387.soft.ftop) + +#define instruction_address (*(struct address *)&I387.soft.fip) +#define operand_address (*(struct address *)&I387.soft.foo) + +#define FPU_access_ok(x,y,z) if ( !access_ok(x,y,z) ) \ + math_abort(FPU_info,SIGSEGV) + +#undef FPU_IGNORE_CODE_SEGV +#ifdef FPU_IGNORE_CODE_SEGV +/* access_ok() is very expensive, and causes the emulator to run + about 20% slower if applied to the code. Anyway, errors due to bad + code addresses should be much rarer than errors due to bad data + addresses. */ +#define FPU_code_access_ok(z) +#else +/* A simpler test than access_ok() can probably be done for + FPU_code_access_ok() because the only possible error is to step + past the upper boundary of a legal code area. */ +#define FPU_code_access_ok(z) FPU_access_ok(VERIFY_READ,(void __user *)FPU_EIP,z) +#endif + +#define FPU_get_user(x,y) get_user((x),(y)) +#define FPU_put_user(x,y) put_user((x),(y)) + +#endif |