mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 08:58:07 +00:00
6d685e5318
These are all functions which are invoked from elsewhere, so annotate them as global using the new SYM_FUNC_START and their ENDPROC's by SYM_FUNC_END. Now, ENTRY/ENDPROC can be forced to be undefined on X86, so do so. Signed-off-by: Jiri Slaby <jslaby@suse.cz> Signed-off-by: Borislav Petkov <bp@suse.de> Cc: Allison Randal <allison@lohutok.net> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Andy Shevchenko <andy@infradead.org> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Bill Metzenthen <billm@melbpc.org.au> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: Darren Hart <dvhart@infradead.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: linux-arch@vger.kernel.org Cc: linux-crypto@vger.kernel.org Cc: linux-efi <linux-efi@vger.kernel.org> Cc: linux-efi@vger.kernel.org Cc: linux-pm@vger.kernel.org Cc: Mark Rutland <mark.rutland@arm.com> Cc: Matt Fleming <matt@codeblueprint.co.uk> Cc: Pavel Machek <pavel@ucw.cz> Cc: platform-driver-x86@vger.kernel.org Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will@kernel.org> Cc: x86-ml <x86@kernel.org> Link: https://lkml.kernel.org/r/20191011115108.12392-28-jslaby@suse.cz
150 lines
3.6 KiB
ArmAsm
150 lines
3.6 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
|
|
.file "reg_u_mul.S"
|
|
/*---------------------------------------------------------------------------+
|
|
| reg_u_mul.S |
|
|
| |
|
|
| Core multiplication routine |
|
|
| |
|
|
| Copyright (C) 1992,1993,1995,1997 |
|
|
| W. Metzenthen, 22 Parker St, Ormond, Vic 3163, Australia |
|
|
| E-mail billm@suburbia.net |
|
|
| |
|
|
| |
|
|
+---------------------------------------------------------------------------*/
|
|
|
|
/*---------------------------------------------------------------------------+
|
|
| Basic multiplication routine. |
|
|
| Does not check the resulting exponent for overflow/underflow |
|
|
| |
|
|
| FPU_u_mul(FPU_REG *a, FPU_REG *b, FPU_REG *c, unsigned int cw); |
|
|
| |
|
|
| Internal working is at approx 128 bits. |
|
|
| Result is rounded to nearest 53 or 64 bits, using "nearest or even". |
|
|
+---------------------------------------------------------------------------*/
|
|
|
|
#include "exception.h"
|
|
#include "fpu_emu.h"
|
|
#include "control_w.h"
|
|
|
|
|
|
|
|
#ifndef NON_REENTRANT_FPU
|
|
/* Local storage on the stack: */
|
|
#define FPU_accum_0 -4(%ebp) /* ms word */
|
|
#define FPU_accum_1 -8(%ebp)
|
|
|
|
#else
|
|
/* Local storage in a static area: */
|
|
.data
|
|
.align 4,0
|
|
FPU_accum_0:
|
|
.long 0
|
|
FPU_accum_1:
|
|
.long 0
|
|
#endif /* NON_REENTRANT_FPU */
|
|
|
|
|
|
.text
|
|
SYM_FUNC_START(FPU_u_mul)
|
|
pushl %ebp
|
|
movl %esp,%ebp
|
|
#ifndef NON_REENTRANT_FPU
|
|
subl $8,%esp
|
|
#endif /* NON_REENTRANT_FPU */
|
|
|
|
pushl %esi
|
|
pushl %edi
|
|
pushl %ebx
|
|
|
|
movl PARAM1,%esi
|
|
movl PARAM2,%edi
|
|
|
|
#ifdef PARANOID
|
|
testl $0x80000000,SIGH(%esi)
|
|
jz L_bugged
|
|
testl $0x80000000,SIGH(%edi)
|
|
jz L_bugged
|
|
#endif /* PARANOID */
|
|
|
|
xorl %ecx,%ecx
|
|
xorl %ebx,%ebx
|
|
|
|
movl SIGL(%esi),%eax
|
|
mull SIGL(%edi)
|
|
movl %eax,FPU_accum_0
|
|
movl %edx,FPU_accum_1
|
|
|
|
movl SIGL(%esi),%eax
|
|
mull SIGH(%edi)
|
|
addl %eax,FPU_accum_1
|
|
adcl %edx,%ebx
|
|
/* adcl $0,%ecx // overflow here is not possible */
|
|
|
|
movl SIGH(%esi),%eax
|
|
mull SIGL(%edi)
|
|
addl %eax,FPU_accum_1
|
|
adcl %edx,%ebx
|
|
adcl $0,%ecx
|
|
|
|
movl SIGH(%esi),%eax
|
|
mull SIGH(%edi)
|
|
addl %eax,%ebx
|
|
adcl %edx,%ecx
|
|
|
|
/* Get the sum of the exponents. */
|
|
movl PARAM6,%eax
|
|
subl EXP_BIAS-1,%eax
|
|
|
|
/* Two denormals can cause an exponent underflow */
|
|
cmpl EXP_WAY_UNDER,%eax
|
|
jg Exp_not_underflow
|
|
|
|
/* Set to a really low value allow correct handling */
|
|
movl EXP_WAY_UNDER,%eax
|
|
|
|
Exp_not_underflow:
|
|
|
|
/* Have now finished with the sources */
|
|
movl PARAM3,%edi /* Point to the destination */
|
|
movw %ax,EXP(%edi)
|
|
|
|
/* Now make sure that the result is normalized */
|
|
testl $0x80000000,%ecx
|
|
jnz LResult_Normalised
|
|
|
|
/* Normalize by shifting left one bit */
|
|
shll $1,FPU_accum_0
|
|
rcll $1,FPU_accum_1
|
|
rcll $1,%ebx
|
|
rcll $1,%ecx
|
|
decw EXP(%edi)
|
|
|
|
LResult_Normalised:
|
|
movl FPU_accum_0,%eax
|
|
movl FPU_accum_1,%edx
|
|
orl %eax,%eax
|
|
jz L_extent_zero
|
|
|
|
orl $1,%edx
|
|
|
|
L_extent_zero:
|
|
movl %ecx,%eax
|
|
jmp fpu_reg_round
|
|
|
|
|
|
#ifdef PARANOID
|
|
L_bugged:
|
|
pushl EX_INTERNAL|0x205
|
|
call EXCEPTION
|
|
pop %ebx
|
|
jmp L_exit
|
|
|
|
L_exit:
|
|
popl %ebx
|
|
popl %edi
|
|
popl %esi
|
|
leave
|
|
ret
|
|
#endif /* PARANOID */
|
|
|
|
SYM_FUNC_END(FPU_u_mul)
|