diff options
Diffstat (limited to 'arch/i386/math-emu/fpu_aux.c')
| -rw-r--r-- | arch/i386/math-emu/fpu_aux.c | 204 |
1 files changed, 0 insertions, 204 deletions
diff --git a/arch/i386/math-emu/fpu_aux.c b/arch/i386/math-emu/fpu_aux.c deleted file mode 100644 index 20886cfb9f7..00000000000 --- a/arch/i386/math-emu/fpu_aux.c +++ /dev/null @@ -1,204 +0,0 @@ -/*---------------------------------------------------------------------------+ - | fpu_aux.c | - | | - | Code to implement some of the FPU auxiliary instructions. | - | | - | Copyright (C) 1992,1993,1994,1997 | - | W. Metzenthen, 22 Parker St, Ormond, Vic 3163, Australia | - | E-mail billm@suburbia.net | - | | - | | - +---------------------------------------------------------------------------*/ - -#include "fpu_system.h" -#include "exception.h" -#include "fpu_emu.h" -#include "status_w.h" -#include "control_w.h" - - -static void fnop(void) -{ -} - -static void fclex(void) -{ - partial_status &= ~(SW_Backward|SW_Summary|SW_Stack_Fault|SW_Precision| - SW_Underflow|SW_Overflow|SW_Zero_Div|SW_Denorm_Op| - SW_Invalid); - no_ip_update = 1; -} - -/* Needs to be externally visible */ -void finit(void) -{ - control_word = 0x037f; - partial_status = 0; - top = 0; /* We don't keep top in the status word internally. */ - fpu_tag_word = 0xffff; - /* The behaviour is different from that detailed in - Section 15.1.6 of the Intel manual */ - operand_address.offset = 0; - operand_address.selector = 0; - instruction_address.offset = 0; - instruction_address.selector = 0; - instruction_address.opcode = 0; - no_ip_update = 1; -} - -/* - * These are nops on the i387.. - */ -#define feni fnop -#define fdisi fnop -#define fsetpm fnop - -static FUNC const finit_table[] = { - feni, fdisi, fclex, finit, - fsetpm, FPU_illegal, FPU_illegal, FPU_illegal -}; - -void finit_(void) -{ - (finit_table[FPU_rm])(); -} - - -static void fstsw_ax(void) -{ - *(short *) &FPU_EAX = status_word(); - no_ip_update = 1; -} - -static FUNC const fstsw_table[] = { - fstsw_ax, FPU_illegal, FPU_illegal, FPU_illegal, - FPU_illegal, FPU_illegal, FPU_illegal, FPU_illegal -}; - -void fstsw_(void) -{ - (fstsw_table[FPU_rm])(); -} - - -static FUNC const fp_nop_table[] = { - fnop, FPU_illegal, FPU_illegal, FPU_illegal, - FPU_illegal, FPU_illegal, FPU_illegal, FPU_illegal -}; - -void fp_nop(void) -{ - (fp_nop_table[FPU_rm])(); -} - - -void fld_i_(void) -{ - FPU_REG *st_new_ptr; - int i; - u_char tag; - - if ( STACK_OVERFLOW ) - { FPU_stack_overflow(); return; } - - /* fld st(i) */ - i = FPU_rm; - if ( NOT_EMPTY(i) ) - { - reg_copy(&st(i), st_new_ptr); - tag = FPU_gettagi(i); - push(); - FPU_settag0(tag); - } - else - { - if ( control_word & CW_Invalid ) - { - /* The masked response */ - FPU_stack_underflow(); - } - else - EXCEPTION(EX_StackUnder); - } - -} - - -void fxch_i(void) -{ - /* fxch st(i) */ - FPU_REG t; - int i = FPU_rm; - FPU_REG *st0_ptr = &st(0), *sti_ptr = &st(i); - long tag_word = fpu_tag_word; - int regnr = top & 7, regnri = ((regnr + i) & 7); - u_char st0_tag = (tag_word >> (regnr*2)) & 3; - u_char sti_tag = (tag_word >> (regnri*2)) & 3; - - if ( st0_tag == TAG_Empty ) - { - if ( sti_tag == TAG_Empty ) - { - FPU_stack_underflow(); - FPU_stack_underflow_i(i); - return; - } - if ( control_word & CW_Invalid ) - { - /* Masked response */ - FPU_copy_to_reg0(sti_ptr, sti_tag); - } - FPU_stack_underflow_i(i); - return; - } - if ( sti_tag == TAG_Empty ) - { - if ( control_word & CW_Invalid ) - { - /* Masked response */ - FPU_copy_to_regi(st0_ptr, st0_tag, i); - } - FPU_stack_underflow(); - return; - } - clear_C1(); - - reg_copy(st0_ptr, &t); - reg_copy(sti_ptr, st0_ptr); - reg_copy(&t, sti_ptr); - - tag_word &= ~(3 << (regnr*2)) & ~(3 << (regnri*2)); - tag_word |= (sti_tag << (regnr*2)) | (st0_tag << (regnri*2)); - fpu_tag_word = tag_word; -} - - -void ffree_(void) -{ - /* ffree st(i) */ - FPU_settagi(FPU_rm, TAG_Empty); -} - - -void ffreep(void) -{ - /* ffree st(i) + pop - unofficial code */ - FPU_settagi(FPU_rm, TAG_Empty); - FPU_pop(); -} - - -void fst_i_(void) -{ - /* fst st(i) */ - FPU_copy_to_regi(&st(0), FPU_gettag0(), FPU_rm); -} - - -void fstp_i(void) -{ - /* fstp st(i) */ - FPU_copy_to_regi(&st(0), FPU_gettag0(), FPU_rm); - FPU_pop(); -} - |