50efc3b8c7
- it works only on x86 with gcc2.95+
- uses the GCC function atribute "regparm(n)" to declare that certain
functions use the register calling convention
- performance improvement is about 6%
186 lines
6.6 KiB
C
186 lines
6.6 KiB
C
/*---------------------------------------------------------------------------+
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| fpu_system.h |
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| $Id: fpu_system.h,v 1.6 2003-03-02 23:59:09 cbothamy Exp $
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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 billm@suburbia.net |
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+---------------------------------------------------------------------------*/
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#ifndef _FPU_SYSTEM_H
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#define _FPU_SYSTEM_H
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#ifndef USE_WITH_CPU_SIM
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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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/* This sets the pointer FPU_info to point to the argument part
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of the stack frame of math_emulate() */
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#define SETUP_DATA_AREA(arg) FPU_info = (struct info *) &arg
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#define LDT_DESCRIPTOR(s) (((struct desc_struct *)current->mm->segments)[(s) >> 3])
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#define SEG_D_SIZE(x) ((x).b & (3 << 21))
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#define SEG_G_BIT(x) ((x).b & (1 << 23))
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#define SEG_GRANULARITY(x) (((x).b & (1 << 23)) ? 4096 : 1)
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#define SEG_286_MODE(x) ((x).b & ( 0xff000000 | 0xf0000 | (1 << 23)))
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#define SEG_BASE_ADDR(s) (((s).b & 0xff000000) \
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| (((s).b & 0xff) << 16) | ((s).a >> 16))
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#define SEG_LIMIT(s) (((s).b & 0xff0000) | ((s).a & 0xffff))
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#define SEG_EXECUTE_ONLY(s) (((s).b & ((1 << 11) | (1 << 9))) == (1 << 11))
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#define SEG_WRITE_PERM(s) (((s).b & ((1 << 11) | (1 << 9))) == (1 << 9))
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#define SEG_EXPAND_DOWN(s) (((s).b & ((1 << 11) | (1 << 10))) \
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== (1 << 10))
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#define I387 (current->tss.i387)
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#define FPU_info (I387.soft.info)
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#define FPU_CS (*(u16 *) &(FPU_info->___cs))
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#define FPU_SS (*(u16 *) &(FPU_info->___ss))
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#define FPU_DS (*(u16 *) &(FPU_info->___ds))
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#define FPU_EAX (FPU_info->___eax)
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#define FPU_EFLAGS (FPU_info->___eflags)
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#define FPU_EIP (FPU_info->___eip)
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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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#define SET_AX(val16) *(s16 *) &FPU_EAX = val16
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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.tos)
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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_verify_area(x,y,z) if ( verify_area(x,y,z) ) \
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math_abort(FPU_info,SIGSEGV)
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#undef FPU_IGNORE_CODE_SEGV
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#ifdef FPU_IGNORE_CODE_SEGV
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/* verify_area() 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_verify_area(z)
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#else
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/* A simpler test than verify_area() can probably be done for
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FPU_code_verify_area() 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_verify_area(z) FPU_verify_area(VERIFY_READ,(void *)FPU_EIP,z)
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#endif
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#define FPU_get_user(x,y) get_user((x),(y))
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#define FPU_put_user(x,y) put_user((x),(y))
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#else /* USE_WITH_CPU_SIM */
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/* -----------------------------------------------------------
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* Slimmed down version used to compile against a CPU simulator
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* rather than a kernel (ported by Kevin Lawton)
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* ------------------------------------------------------------ */
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#include <cpu/i387.h>
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/* bbd: include ported linux headers after config.h for GCC_ATTRIBUTE macro */
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <asm/math_emu.h>
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#include <linux/types.h>
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#ifndef WORDS_BIGENDIAN
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#error "WORDS_BIGENDIAN not defined in config.h"
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#elif WORDS_BIGENDIAN == 1
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#define EMU_BIG_ENDIAN 1
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#else
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/* Nothing needed. Lack of defining EMU_BIG_ENDIAN means
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* small endian
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*/
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#endif
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extern unsigned fpu_get_user(void *ptr, unsigned len) BX_CPP_AttrRegparmN(2);
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extern void fpu_put_user(unsigned val, void *ptr, unsigned len) BX_CPP_AttrRegparmN(2);
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extern void fpu_verify_area(unsigned what, void *ptr, unsigned n) BX_CPP_AttrRegparmN(3);
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extern void math_emulate_init(void);
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extern unsigned fpu_get_ds(void);
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extern void fpu_set_ax(u16);
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#ifndef __ASSEMBLY__
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struct info {
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#ifdef BX_NO_EMPTY_STRUCTS
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unsigned char donotindexme;
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#endif
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};
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#define FPU_info ((struct info *) NULL)
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#endif
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#define SIGSEGV 11
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extern i387_t *current_i387;
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#define i387 (*current_i387)
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#define I387 i387
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#define SET_AX(val16) fpu_set_ax(val16);
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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.tos)
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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_verify_area(x,y,z) fpu_verify_area(x,y,z)
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#define FPU_get_user(x,y) ((x) = fpu_get_user((y), sizeof(*(y))))
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#define FPU_put_user(val,ptr) fpu_put_user((val),(ptr),sizeof(*(ptr)))
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#define FPU_DS (fpu_get_ds())
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#endif /* USE_WITH_CPU_SIM */
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// bbd: Change a pointer to an int, with type conversions that make it legal.
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// First make it a void pointer, then convert to an integer of the same
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// size as the pointer. Otherwise, on machines with 64-bit pointers,
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// compilers complain when you typecast a 64-bit pointer into a 32-bit integer.
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#define PTR2INT(x) ((bx_ptr_equiv_t)(void *)(x))
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// bbd: Change an int to a pointer, with type conversions that make it legal.
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// Same strategy as PTR2INT: change to bx_ptr_equiv_t which is an integer
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// type of the same size as FPU_REG*. Then the conversion to pointer
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// is legal.
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#define REGNO2PTR(x) ((FPU_REG*)((bx_ptr_equiv_t)(x)))
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#endif
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