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130 lines
4.4 KiB
130 lines
4.4 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/*---------------------------------------------------------------------------+ |
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| fpu_system.h | |
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| | |
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| Copyright (C) 1992,1994,1997 | |
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| W. Metzenthen, 22 Parker St, Ormond, Vic 3163, | |
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| Australia. E-mail [email protected] | |
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| | |
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+---------------------------------------------------------------------------*/ |
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#ifndef _FPU_SYSTEM_H |
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#define _FPU_SYSTEM_H |
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/* system dependent definitions */ |
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#include <linux/sched.h> |
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#include <linux/kernel.h> |
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#include <linux/mm.h> |
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#include <asm/desc.h> |
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#include <asm/mmu_context.h> |
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static inline struct desc_struct FPU_get_ldt_descriptor(unsigned seg) |
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{ |
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static struct desc_struct zero_desc; |
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struct desc_struct ret = zero_desc; |
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#ifdef CONFIG_MODIFY_LDT_SYSCALL |
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seg >>= 3; |
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mutex_lock(¤t->mm->context.lock); |
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if (current->mm->context.ldt && seg < current->mm->context.ldt->nr_entries) |
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ret = current->mm->context.ldt->entries[seg]; |
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mutex_unlock(¤t->mm->context.lock); |
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#endif |
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return ret; |
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} |
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#define SEG_TYPE_WRITABLE (1U << 1) |
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#define SEG_TYPE_EXPANDS_DOWN (1U << 2) |
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#define SEG_TYPE_EXECUTE (1U << 3) |
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#define SEG_TYPE_EXPAND_MASK (SEG_TYPE_EXPANDS_DOWN | SEG_TYPE_EXECUTE) |
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#define SEG_TYPE_EXECUTE_MASK (SEG_TYPE_WRITABLE | SEG_TYPE_EXECUTE) |
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static inline unsigned long seg_get_base(struct desc_struct *d) |
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{ |
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unsigned long base = (unsigned long)d->base2 << 24; |
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return base | ((unsigned long)d->base1 << 16) | d->base0; |
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} |
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static inline unsigned long seg_get_limit(struct desc_struct *d) |
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{ |
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return ((unsigned long)d->limit1 << 16) | d->limit0; |
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} |
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static inline unsigned long seg_get_granularity(struct desc_struct *d) |
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{ |
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return d->g ? 4096 : 1; |
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} |
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static inline bool seg_expands_down(struct desc_struct *d) |
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{ |
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return (d->type & SEG_TYPE_EXPAND_MASK) == SEG_TYPE_EXPANDS_DOWN; |
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} |
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static inline bool seg_execute_only(struct desc_struct *d) |
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{ |
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return (d->type & SEG_TYPE_EXECUTE_MASK) == SEG_TYPE_EXECUTE; |
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} |
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static inline bool seg_writable(struct desc_struct *d) |
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{ |
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return (d->type & SEG_TYPE_EXECUTE_MASK) == SEG_TYPE_WRITABLE; |
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} |
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#define I387 (¤t->thread.fpu.state) |
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#define FPU_info (I387->soft.info) |
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#define FPU_CS (*(unsigned short *) &(FPU_info->regs->cs)) |
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#define FPU_SS (*(unsigned short *) &(FPU_info->regs->ss)) |
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#define FPU_DS (*(unsigned short *) &(FPU_info->regs->ds)) |
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#define FPU_EAX (FPU_info->regs->ax) |
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#define FPU_EFLAGS (FPU_info->regs->flags) |
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#define FPU_EIP (FPU_info->regs->ip) |
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#define FPU_ORIG_EIP (FPU_info->___orig_eip) |
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#define FPU_lookahead (I387->soft.lookahead) |
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/* nz if ip_offset and cs_selector are not to be set for the current |
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instruction. */ |
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#define no_ip_update (*(u_char *)&(I387->soft.no_update)) |
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#define FPU_rm (*(u_char *)&(I387->soft.rm)) |
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/* Number of bytes of data which can be legally accessed by the current |
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instruction. This only needs to hold a number <= 108, so a byte will do. */ |
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#define access_limit (*(u_char *)&(I387->soft.alimit)) |
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#define partial_status (I387->soft.swd) |
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#define control_word (I387->soft.cwd) |
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#define fpu_tag_word (I387->soft.twd) |
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#define registers (I387->soft.st_space) |
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#define top (I387->soft.ftop) |
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#define instruction_address (*(struct address *)&I387->soft.fip) |
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#define operand_address (*(struct address *)&I387->soft.foo) |
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#define FPU_access_ok(y,z) if ( !access_ok(y,z) ) \ |
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math_abort(FPU_info,SIGSEGV) |
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#define FPU_abort math_abort(FPU_info, SIGSEGV) |
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#define FPU_copy_from_user(to, from, n) \ |
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do { if (copy_from_user(to, from, n)) FPU_abort; } while (0) |
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#undef FPU_IGNORE_CODE_SEGV |
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#ifdef FPU_IGNORE_CODE_SEGV |
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/* access_ok() is very expensive, and causes the emulator to run |
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about 20% slower if applied to the code. Anyway, errors due to bad |
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code addresses should be much rarer than errors due to bad data |
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addresses. */ |
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#define FPU_code_access_ok(z) |
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#else |
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/* A simpler test than access_ok() can probably be done for |
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FPU_code_access_ok() because the only possible error is to step |
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past the upper boundary of a legal code area. */ |
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#define FPU_code_access_ok(z) FPU_access_ok((void __user *)FPU_EIP,z) |
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#endif |
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#define FPU_get_user(x,y) do { if (get_user((x),(y))) FPU_abort; } while (0) |
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#define FPU_put_user(x,y) do { if (put_user((x),(y))) FPU_abort; } while (0) |
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#endif
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