projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /*---------------------------------------------------------------------------+ |
| 2 | | fpu_system.h | | |
| 3 | | | | |
| 4 | | Copyright (C) 1992,1994,1997 | | |
| 5 | | W. Metzenthen, 22 Parker St, Ormond, Vic 3163, | | |
| 6 | | Australia. E-mail billm@suburbia.net | | |
| 7 | | | | |
| 8 | +---------------------------------------------------------------------------*/ | |
| 9 | ||
| 10 | #ifndef _FPU_SYSTEM_H | |
| 11 | #define _FPU_SYSTEM_H | |
| 12 | ||
| 13 | /* system dependent definitions */ | |
| 14 | ||
| 15 | #include <linux/sched.h> | |
| 16 | #include <linux/kernel.h> | |
| 17 | #include <linux/mm.h> | |
| 18 | ||
| 19 | /* This sets the pointer FPU_info to point to the argument part | |
| 20 | of the stack frame of math_emulate() */ | |
| 21 | #define SETUP_DATA_AREA(arg) FPU_info = (struct info *) &arg | |
| 22 | ||
| 23 | /* s is always from a cpu register, and the cpu does bounds checking | |
| 24 | * during register load --> no further bounds checks needed */ | |
| 25 | #define LDT_DESCRIPTOR(s) (((struct desc_struct *)current->mm->context.ldt)[(s) >> 3]) | |
| 26 | #define SEG_D_SIZE(x) ((x).b & (3 << 21)) | |
| 27 | #define SEG_G_BIT(x) ((x).b & (1 << 23)) | |
| 28 | #define SEG_GRANULARITY(x) (((x).b & (1 << 23)) ? 4096 : 1) | |
| 29 | #define SEG_286_MODE(x) ((x).b & ( 0xff000000 | 0xf0000 | (1 << 23))) | |
| 30 | #define SEG_BASE_ADDR(s) (((s).b & 0xff000000) \ | |
| 31 | | (((s).b & 0xff) << 16) | ((s).a >> 16)) | |
| 32 | #define SEG_LIMIT(s) (((s).b & 0xff0000) | ((s).a & 0xffff)) | |
| 33 | #define SEG_EXECUTE_ONLY(s) (((s).b & ((1 << 11) | (1 << 9))) == (1 << 11)) | |
| 34 | #define SEG_WRITE_PERM(s) (((s).b & ((1 << 11) | (1 << 9))) == (1 << 9)) | |
| 35 | #define SEG_EXPAND_DOWN(s) (((s).b & ((1 << 11) | (1 << 10))) \ | |
| 36 | == (1 << 10)) | |
| 37 | ||
| 61c4628b SS |
38 | #define I387 (current->thread.xstate) |
| 39 | #define FPU_info (I387->soft.info) | |
| 1da177e4 LT |
40 | |
| 41 | #define FPU_CS (*(unsigned short *) &(FPU_info->___cs)) | |
| 42 | #define FPU_SS (*(unsigned short *) &(FPU_info->___ss)) | |
| 43 | #define FPU_DS (*(unsigned short *) &(FPU_info->___ds)) | |
| 44 | #define FPU_EAX (FPU_info->___eax) | |
| 45 | #define FPU_EFLAGS (FPU_info->___eflags) | |
| 46 | #define FPU_EIP (FPU_info->___eip) | |
| 47 | #define FPU_ORIG_EIP (FPU_info->___orig_eip) | |
| 48 | ||
| 61c4628b | 49 | #define FPU_lookahead (I387->soft.lookahead) |
| 1da177e4 LT |
50 | |
| 51 | /* nz if ip_offset and cs_selector are not to be set for the current | |
| 52 | instruction. */ | |
| 61c4628b SS |
53 | #define no_ip_update (*(u_char *)&(I387->soft.no_update)) |
| 54 | #define FPU_rm (*(u_char *)&(I387->soft.rm)) | |
| 1da177e4 LT |
55 | |
| 56 | /* Number of bytes of data which can be legally accessed by the current | |
| 57 | instruction. This only needs to hold a number <= 108, so a byte will do. */ | |
| 61c4628b | 58 | #define access_limit (*(u_char *)&(I387->soft.alimit)) |
| 1da177e4 | 59 | |
| 61c4628b SS |
60 | #define partial_status (I387->soft.swd) |
| 61 | #define control_word (I387->soft.cwd) | |
| 62 | #define fpu_tag_word (I387->soft.twd) | |
| 63 | #define registers (I387->soft.st_space) | |
| 64 | #define top (I387->soft.ftop) | |
| 1da177e4 | 65 | |
| 61c4628b SS |
66 | #define instruction_address (*(struct address *)&I387->soft.fip) |
| 67 | #define operand_address (*(struct address *)&I387->soft.foo) | |
| 1da177e4 LT |
68 | |
| 69 | #define FPU_access_ok(x,y,z) if ( !access_ok(x,y,z) ) \ | |
| 70 | math_abort(FPU_info,SIGSEGV) | |
| d606f88f | 71 | #define FPU_abort math_abort(FPU_info, SIGSEGV) |
| 1da177e4 LT |
72 | |
| 73 | #undef FPU_IGNORE_CODE_SEGV | |
| 74 | #ifdef FPU_IGNORE_CODE_SEGV | |
| 75 | /* access_ok() is very expensive, and causes the emulator to run | |
| 76 | about 20% slower if applied to the code. Anyway, errors due to bad | |
| 77 | code addresses should be much rarer than errors due to bad data | |
| 78 | addresses. */ | |
| 79 | #define FPU_code_access_ok(z) | |
| 80 | #else | |
| 81 | /* A simpler test than access_ok() can probably be done for | |
| 82 | FPU_code_access_ok() because the only possible error is to step | |
| 83 | past the upper boundary of a legal code area. */ | |
| 84 | #define FPU_code_access_ok(z) FPU_access_ok(VERIFY_READ,(void __user *)FPU_EIP,z) | |
| 85 | #endif | |
| 86 | ||
| 87 | #define FPU_get_user(x,y) get_user((x),(y)) | |
| 88 | #define FPU_put_user(x,y) put_user((x),(y)) | |
| 89 | ||
| 90 | #endif |