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linux/arch/powerpc/kvm/fpu.S
Andreas Schwab 05d77ac90c powerpc: Remove fpscr use from [kvm_]cvt_{fd,df} 
Neither lfs nor stfs touch the fpscr, so remove the restore/save of it
around them.

Signed-off-by: Andreas Schwab <schwab@linux-m68k.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2010-09-02 14:07:32 +10:00

284 lines
5.7 KiB
ArmAsm
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/*
* FPU helper code to use FPU operations from inside the kernel
*
* Copyright (C) 2010 Alexander Graf (agraf@suse.de)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#include <asm/reg.h>
#include <asm/page.h>
#include <asm/mmu.h>
#include <asm/pgtable.h>
#include <asm/cputable.h>
#include <asm/cache.h>
#include <asm/thread_info.h>
#include <asm/ppc_asm.h>
#include <asm/asm-offsets.h>
/* Instructions operating on single parameters */
/*
* Single operation with one input operand
*
* R3 = (double*)&fpscr
* R4 = (short*)&result
* R5 = (short*)&param1
*/
#define FPS_ONE_IN(name) \
_GLOBAL(fps_ ## name); \
lfd 0,0(r3); /* load up fpscr value */ \
MTFSF_L(0); \
lfs 0,0(r5); \
\
name 0,0; \
\
stfs 0,0(r4); \
mffs 0; \
stfd 0,0(r3); /* save new fpscr value */ \
blr
/*
* Single operation with two input operands
*
* R3 = (double*)&fpscr
* R4 = (short*)&result
* R5 = (short*)&param1
* R6 = (short*)&param2
*/
#define FPS_TWO_IN(name) \
_GLOBAL(fps_ ## name); \
lfd 0,0(r3); /* load up fpscr value */ \
MTFSF_L(0); \
lfs 0,0(r5); \
lfs 1,0(r6); \
\
name 0,0,1; \
\
stfs 0,0(r4); \
mffs 0; \
stfd 0,0(r3); /* save new fpscr value */ \
blr
/*
* Single operation with three input operands
*
* R3 = (double*)&fpscr
* R4 = (short*)&result
* R5 = (short*)&param1
* R6 = (short*)&param2
* R7 = (short*)&param3
*/
#define FPS_THREE_IN(name) \
_GLOBAL(fps_ ## name); \
lfd 0,0(r3); /* load up fpscr value */ \
MTFSF_L(0); \
lfs 0,0(r5); \
lfs 1,0(r6); \
lfs 2,0(r7); \
\
name 0,0,1,2; \
\
stfs 0,0(r4); \
mffs 0; \
stfd 0,0(r3); /* save new fpscr value */ \
blr
FPS_ONE_IN(fres)
FPS_ONE_IN(frsqrte)
FPS_ONE_IN(fsqrts)
FPS_TWO_IN(fadds)
FPS_TWO_IN(fdivs)
FPS_TWO_IN(fmuls)
FPS_TWO_IN(fsubs)
FPS_THREE_IN(fmadds)
FPS_THREE_IN(fmsubs)
FPS_THREE_IN(fnmadds)
FPS_THREE_IN(fnmsubs)
FPS_THREE_IN(fsel)
/* Instructions operating on double parameters */
/*
* Beginning of double instruction processing
*
* R3 = (double*)&fpscr
* R4 = (u32*)&cr
* R5 = (double*)&result
* R6 = (double*)&param1
* R7 = (double*)&param2 [load_two]
* R8 = (double*)&param3 [load_three]
* LR = instruction call function
*/
fpd_load_three:
lfd 2,0(r8) /* load param3 */
fpd_load_two:
lfd 1,0(r7) /* load param2 */
fpd_load_one:
lfd 0,0(r6) /* load param1 */
fpd_load_none:
lfd 3,0(r3) /* load up fpscr value */
MTFSF_L(3)
lwz r6, 0(r4) /* load cr */
mtcr r6
blr
/*
* End of double instruction processing
*
* R3 = (double*)&fpscr
* R4 = (u32*)&cr
* R5 = (double*)&result
* LR = caller of instruction call function
*/
fpd_return:
mfcr r6
stfd 0,0(r5) /* save result */
mffs 0
stfd 0,0(r3) /* save new fpscr value */
stw r6,0(r4) /* save new cr value */
blr
/*
* Double operation with no input operand
*
* R3 = (double*)&fpscr
* R4 = (u32*)&cr
* R5 = (double*)&result
*/
#define FPD_NONE_IN(name) \
_GLOBAL(fpd_ ## name); \
mflr r12; \
bl fpd_load_none; \
mtlr r12; \
\
name. 0; /* call instruction */ \
b fpd_return
/*
* Double operation with one input operand
*
* R3 = (double*)&fpscr
* R4 = (u32*)&cr
* R5 = (double*)&result
* R6 = (double*)&param1
*/
#define FPD_ONE_IN(name) \
_GLOBAL(fpd_ ## name); \
mflr r12; \
bl fpd_load_one; \
mtlr r12; \
\
name. 0,0; /* call instruction */ \
b fpd_return
/*
* Double operation with two input operands
*
* R3 = (double*)&fpscr
* R4 = (u32*)&cr
* R5 = (double*)&result
* R6 = (double*)&param1
* R7 = (double*)&param2
* R8 = (double*)&param3
*/
#define FPD_TWO_IN(name) \
_GLOBAL(fpd_ ## name); \
mflr r12; \
bl fpd_load_two; \
mtlr r12; \
\
name. 0,0,1; /* call instruction */ \
b fpd_return
/*
* CR Double operation with two input operands
*
* R3 = (double*)&fpscr
* R4 = (u32*)&cr
* R5 = (double*)&param1
* R6 = (double*)&param2
* R7 = (double*)&param3
*/
#define FPD_TWO_IN_CR(name) \
_GLOBAL(fpd_ ## name); \
lfd 1,0(r6); /* load param2 */ \
lfd 0,0(r5); /* load param1 */ \
lfd 3,0(r3); /* load up fpscr value */ \
MTFSF_L(3); \
lwz r6, 0(r4); /* load cr */ \
mtcr r6; \
\
name 0,0,1; /* call instruction */ \
mfcr r6; \
mffs 0; \
stfd 0,0(r3); /* save new fpscr value */ \
stw r6,0(r4); /* save new cr value */ \
blr
/*
* Double operation with three input operands
*
* R3 = (double*)&fpscr
* R4 = (u32*)&cr
* R5 = (double*)&result
* R6 = (double*)&param1
* R7 = (double*)&param2
* R8 = (double*)&param3
*/
#define FPD_THREE_IN(name) \
_GLOBAL(fpd_ ## name); \
mflr r12; \
bl fpd_load_three; \
mtlr r12; \
\
name. 0,0,1,2; /* call instruction */ \
b fpd_return
FPD_ONE_IN(fsqrts)
FPD_ONE_IN(frsqrtes)
FPD_ONE_IN(fres)
FPD_ONE_IN(frsp)
FPD_ONE_IN(fctiw)
FPD_ONE_IN(fctiwz)
FPD_ONE_IN(fsqrt)
FPD_ONE_IN(fre)
FPD_ONE_IN(frsqrte)
FPD_ONE_IN(fneg)
FPD_ONE_IN(fabs)
FPD_TWO_IN(fadds)
FPD_TWO_IN(fsubs)
FPD_TWO_IN(fdivs)
FPD_TWO_IN(fmuls)
FPD_TWO_IN_CR(fcmpu)
FPD_TWO_IN(fcpsgn)
FPD_TWO_IN(fdiv)
FPD_TWO_IN(fadd)
FPD_TWO_IN(fmul)
FPD_TWO_IN_CR(fcmpo)
FPD_TWO_IN(fsub)
FPD_THREE_IN(fmsubs)
FPD_THREE_IN(fmadds)
FPD_THREE_IN(fnmsubs)
FPD_THREE_IN(fnmadds)
FPD_THREE_IN(fsel)
FPD_THREE_IN(fmsub)
FPD_THREE_IN(fmadd)
FPD_THREE_IN(fnmsub)
FPD_THREE_IN(fnmadd)
_GLOBAL(kvm_cvt_fd)
lfs 0,0(r3)
stfd 0,0(r4)
blr
_GLOBAL(kvm_cvt_df)
lfd 0,0(r3)
stfs 0,0(r4)
blr
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