mirror of
https://git.code.sf.net/p/quake/quake2forge
synced 2024-12-12 13:42:21 +00:00
94 lines
1.2 KiB
ArmAsm
94 lines
1.2 KiB
ArmAsm
//
|
|
// sys_dosa.s
|
|
// x86 assembly-language DOS-dependent routines.
|
|
|
|
#include "qasm.h"
|
|
|
|
|
|
.data
|
|
|
|
.align 4
|
|
fpenv:
|
|
.long 0, 0, 0, 0, 0, 0, 0, 0
|
|
|
|
.text
|
|
|
|
.globl C(MaskExceptions)
|
|
C(MaskExceptions):
|
|
fnstenv fpenv
|
|
orl $0x3F,fpenv
|
|
fldenv fpenv
|
|
|
|
ret
|
|
|
|
#if 0
|
|
.globl C(unmaskexceptions)
|
|
C(unmaskexceptions):
|
|
fnstenv fpenv
|
|
andl $0xFFFFFFE0,fpenv
|
|
fldenv fpenv
|
|
|
|
ret
|
|
#endif
|
|
|
|
.data
|
|
|
|
.align 4
|
|
.globl ceil_cw, single_cw, full_cw, cw, pushed_cw
|
|
ceil_cw: .long 0
|
|
single_cw: .long 0
|
|
full_cw: .long 0
|
|
cw: .long 0
|
|
pushed_cw: .long 0
|
|
|
|
.text
|
|
|
|
.globl C(Sys_LowFPPrecision)
|
|
C(Sys_LowFPPrecision):
|
|
fldcw single_cw
|
|
|
|
ret
|
|
|
|
.globl C(Sys_HighFPPrecision)
|
|
C(Sys_HighFPPrecision):
|
|
fldcw full_cw
|
|
|
|
ret
|
|
|
|
.globl C(Sys_PushFPCW_SetHigh)
|
|
C(Sys_PushFPCW_SetHigh):
|
|
fnstcw pushed_cw
|
|
fldcw full_cw
|
|
|
|
ret
|
|
|
|
.globl C(Sys_PopFPCW)
|
|
C(Sys_PopFPCW):
|
|
fldcw pushed_cw
|
|
|
|
ret
|
|
|
|
.globl C(Sys_SetFPCW)
|
|
C(Sys_SetFPCW):
|
|
fnstcw cw
|
|
movl cw,%eax
|
|
#if id386
|
|
andb $0xF0,%ah
|
|
orb $0x03,%ah // round mode, 64-bit precision
|
|
#endif
|
|
movl %eax,full_cw
|
|
|
|
#if id386
|
|
andb $0xF0,%ah
|
|
orb $0x0C,%ah // chop mode, single precision
|
|
#endif
|
|
movl %eax,single_cw
|
|
|
|
#if id386
|
|
andb $0xF0,%ah
|
|
orb $0x08,%ah // ceil mode, single precision
|
|
#endif
|
|
movl %eax,ceil_cw
|
|
|
|
ret
|
|
|