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rdrand_asm.S
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rdrand_asm.S
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/*
* Copyright (c) 2011-2014, Intel Corporation
* Authors: Fenghua Yu <fenghua.yu@intel.com>,
* H. Peter Anvin <hpa@linux.intel.com>
* PIC code by: Francisco Blas Izquierdo Riera (klondike) <klondike@gentoo.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
/* Add Intel CET IBT instrumentation */
#if defined __CET__ && (__CET__ & 1)
#ifdef __x86_64__
#define ENTRY(x) \
.balign 64 ; \
.globl x ; \
x: \
endbr64
#elif defined(__i386__)
#define ENTRY(x) \
.balign 64 ; \
.globl x ; \
x: \
endbr32
#endif /* __x86_64__ */
#else /* __CET__ */
#define ENTRY(x) \
.balign 64 ; \
.globl x ; \
x:
#endif /* __CET__ */
#define ENDPROC(x) \
.size x, .-x ; \
.type x, @function
#define RDRAND_RETRY_LIMIT 10
#ifdef __x86_64__
ENTRY(x86_rdrand_bytes)
mov %esi, %eax
1:
mov $RDRAND_RETRY_LIMIT, %ecx
2:
rdrand %rdx
jnc 3f
mov %rdx, (%rdi)
add $8, %rdi
sub $8, %esi
ja 1b
4:
sub %esi, %eax
ret
3:
dec %ecx
rep;nop
jnz 2b
jmp 4b
ENDPROC(x86_rdrand_bytes)
ENTRY(x86_rdseed_or_rdrand_bytes)
mov (%rsi), %r8d /* RDSEED count */
mov (%rcx), %r9d /* RDRAND count */
1:
mov $RDRAND_RETRY_LIMIT, %r10d
2:
rdseed %rax
jnc 3f
mov %rax, (%rdi)
add $8, %rdi
sub $8, %r8d
ja 1b
4:
sub %r8d, (%rsi)
sub %r9d, (%rcx)
ret
3:
rdrand %rax
jnc 5f
mov %rax, (%rdx)
add $8, %rdx
sub $8, %r9d
ja 1b
jmp 4b
5:
dec %r10d
rep;nop
jnz 2b
jmp 4b
ENDPROC(x86_rdseed_or_rdrand_bytes)
#define SETPTR(var,ptr) leaq var(%rip),ptr
#define PTR0 %rdi
#define PTR1 %rsi
#define PTR2 %rcx
#define CTR3 %eax
#define NPTR2 1 /* %rcx = %r1, only 0-7 valid here */
#elif defined(__i386__)
ENTRY(x86_rdrand_bytes)
push %ebp
mov %esp, %ebp
push %edi
push %esi
movl 8(%ebp), %edi
movl 12(%ebp), %esi
mov %esi, %eax
1:
mov $RDRAND_RETRY_LIMIT, %ecx
2:
rdrand %edx
jnc 3f
mov %edx, (%edi)
add $4, %edi
sub $4, %esi
ja 1b
4:
sub %esi, %eax
pop %esi
pop %edi
pop %ebp
ret
3:
dec %ecx
rep;nop
jnz 2b
jmp 4b
ENDPROC(x86_rdrand_bytes)
ENTRY(x86_rdseed_or_rdrand_bytes)
push %ebp
mov %esp, %ebp
push %edi
push %esi
push %ebx
mov 12(%ebp), %ebx
mov 20(%ebp), %esi
mov 8(%ebp), %edi /* RDSEED pointer */
mov 16(%ebp), %edx /* RDRAND pointer */
mov (%ebx), %ebx /* RDSEED count */
mov (%esi), %esi /* RDRAND count */
1:
mov $RDRAND_RETRY_LIMIT, %ecx
2:
rdseed %eax
jnc 3f
mov %eax, (%edi)
add $4, %edi
sub $4, %ebx
ja 1b
4:
mov 12(%ebp), %edx
mov 20(%ebp), %eax
sub %ebx, (%edx) /* RDSEED count */
sub %esi, (%eax) /* RDRAND count */
pop %ebx
pop %esi
pop %edi
pop %ebp
ret
3:
rdrand %eax
jnc 5f
mov %eax, (%edx)
add $4, %edx
sub $4, %esi
jnz 1b
ja 4b
5:
dec %ecx
rep;nop
jnz 2b
jmp 4b
ENDPROC(x86_rdseed_or_rdrand_bytes)
#if defined(__PIC__)
#define INIT_PIC() \
pushl %ebx ; \
call __x86.get_pc_thunk.bx ; \
addl $_GLOBAL_OFFSET_TABLE_, %ebx
#define END_PIC() \
popl %ebx
#define SETPTR(var,ptr) leal (var)@GOTOFF(%ebx),ptr
#else
#define INIT_PIC()
#define END_PIC()
#define SETPTR(var,ptr) movl $(var),ptr
#endif
#define PTR0 %eax
#define PTR1 %edx
#define PTR2 %ecx
#define CTR3 %esi
#define NPTR2 1 /* %rcx = %r1 */
#endif
ENTRY(x86_aes_mangle)
#ifdef __i386__
push %ebp
mov %esp, %ebp
movl 8(%ebp), %eax
movl 12(%ebp), %edx
push %esi
INIT_PIC()
#endif
movl $512, CTR3 /* Number of rounds */
movdqa (0*16)(PTR1), %xmm0
movdqa (1*16)(PTR1), %xmm1
movdqa (2*16)(PTR1), %xmm2
movdqa (3*16)(PTR1), %xmm3
movdqa (4*16)(PTR1), %xmm4
movdqa (5*16)(PTR1), %xmm5
movdqa (6*16)(PTR1), %xmm6
movdqa (7*16)(PTR1), %xmm7
#ifdef __x86_64__
SETPTR(aes_round_keys, PTR2)
1:
#else
1:
SETPTR(aes_round_keys, PTR2)
#endif
/* 8192 = 512 (rounds) * 16 (bytes) */
pxor (0*8192)(PTR0), %xmm0
pxor (1*8192)(PTR0), %xmm1
pxor (2*8192)(PTR0), %xmm2
pxor (3*8192)(PTR0), %xmm3
pxor (4*8192)(PTR0), %xmm4
pxor (5*8192)(PTR0), %xmm5
pxor (6*8192)(PTR0), %xmm6
pxor (7*8192)(PTR0), %xmm7
add $16, PTR0
offset = 0
.rept 10
#ifdef __x86_64__
movdqa offset(PTR2), %xmm8
offset = offset + 16
.byte 0x66,0x41,0x0f,0x38,0xdc,0xc0 /* aesenc %xmm8, %xmm0 */
.byte 0x66,0x41,0x0f,0x38,0xdc,0xc8 /* aesenc %xmm8, %xmm1 */
.byte 0x66,0x41,0x0f,0x38,0xdc,0xd0 /* aesenc %xmm8, %xmm2 */
.byte 0x66,0x41,0x0f,0x38,0xdc,0xd8 /* aesenc %xmm8, %xmm3 */
.byte 0x66,0x41,0x0f,0x38,0xdc,0xe0 /* aesenc %xmm8, %xmm4 */
.byte 0x66,0x41,0x0f,0x38,0xdc,0xe8 /* aesenc %xmm8, %xmm5 */
.byte 0x66,0x41,0x0f,0x38,0xdc,0xf0 /* aesenc %xmm8, %xmm6 */
.byte 0x66,0x41,0x0f,0x38,0xdc,0xf8 /* aesenc %xmm8, %xmm7 */
#else
.byte 0x66,0x0f,0x38,0xdc,0x00+NPTR2 /* aesenc (PTR2), %xmm0 */
.byte 0x66,0x0f,0x38,0xdc,0x08+NPTR2 /* aesenc (PTR2), %xmm1 */
.byte 0x66,0x0f,0x38,0xdc,0x10+NPTR2 /* aesenc (PTR2), %xmm2 */
.byte 0x66,0x0f,0x38,0xdc,0x18+NPTR2 /* aesenc (PTR2), %xmm3 */
.byte 0x66,0x0f,0x38,0xdc,0x20+NPTR2 /* aesenc (PTR2), %xmm4 */
.byte 0x66,0x0f,0x38,0xdc,0x28+NPTR2 /* aesenc (PTR2), %xmm5 */
.byte 0x66,0x0f,0x38,0xdc,0x30+NPTR2 /* aesenc (PTR2), %xmm6 */
.byte 0x66,0x0f,0x38,0xdc,0x38+NPTR2 /* aesenc (PTR2), %xmm7 */
add $16, PTR2
#endif
.endr
#ifdef __x86_64__
movdqa offset(PTR2), %xmm8
.byte 0x66,0x41,0x0f,0x38,0xdd,0xc0 /* aesenclast %xmm8, %xmm0 */
.byte 0x66,0x41,0x0f,0x38,0xdd,0xc8 /* aesenclast %xmm8, %xmm1 */
.byte 0x66,0x41,0x0f,0x38,0xdd,0xd0 /* aesenclast %xmm8, %xmm2 */
.byte 0x66,0x41,0x0f,0x38,0xdd,0xd8 /* aesenclast %xmm8, %xmm3 */
.byte 0x66,0x41,0x0f,0x38,0xdd,0xe0 /* aesenclast %xmm8, %xmm4 */
.byte 0x66,0x41,0x0f,0x38,0xdd,0xe8 /* aesenclast %xmm8, %xmm5 */
.byte 0x66,0x41,0x0f,0x38,0xdd,0xf0 /* aesenclast %xmm8, %xmm6 */
.byte 0x66,0x41,0x0f,0x38,0xdd,0xf8 /* aesenclast %xmm8, %xmm7 */
#else
.byte 0x66,0x0f,0x38,0xdd,0x00+NPTR2 /* aesenclast (PTR2), %xmm0 */
.byte 0x66,0x0f,0x38,0xdd,0x08+NPTR2 /* aesenclast (PTR2), %xmm1 */
.byte 0x66,0x0f,0x38,0xdd,0x10+NPTR2 /* aesenclast (PTR2), %xmm2 */
.byte 0x66,0x0f,0x38,0xdd,0x18+NPTR2 /* aesenclast (PTR2), %xmm3 */
.byte 0x66,0x0f,0x38,0xdd,0x20+NPTR2 /* aesenclast (PTR2), %xmm4 */
.byte 0x66,0x0f,0x38,0xdd,0x28+NPTR2 /* aesenclast (PTR2), %xmm5 */
.byte 0x66,0x0f,0x38,0xdd,0x30+NPTR2 /* aesenclast (PTR2), %xmm6 */
.byte 0x66,0x0f,0x38,0xdd,0x38+NPTR2 /* aesenclast (PTR2), %xmm7 */
#endif
sub $1, CTR3
jnz 1b
movdqa %xmm0, (0*16)(PTR1)
movdqa %xmm1, (1*16)(PTR1)
movdqa %xmm2, (2*16)(PTR1)
movdqa %xmm3, (3*16)(PTR1)
movdqa %xmm4, (4*16)(PTR1)
movdqa %xmm5, (5*16)(PTR1)
movdqa %xmm6, (6*16)(PTR1)
movdqa %xmm7, (7*16)(PTR1)
#ifdef __i386__
END_PIC()
pop %esi
pop %ebp
#endif
ret
ENDPROC(x86_aes_mangle)
/* aeskeygenassist $imm,%xmm0,%xmm1 */
#define AESKEYGENASSIST(imm) .byte 0x66,0x0f,0x3a,0xdf,0xc8,imm
ENTRY(x86_aes_expand_key)
#ifdef __i386__
push %ebp
mov %esp, %ebp
movl 8(%ebp), %eax
INIT_PIC()
#endif
SETPTR(aes_round_keys, PTR1)
movdqu (PTR0), %xmm0
movdqa %xmm0, (PTR1) /* First slot = the plain key */
add $16, PTR1
AESKEYGENASSIST(0x01)
call 1f
AESKEYGENASSIST(0x02)
call 1f
AESKEYGENASSIST(0x04)
call 1f
AESKEYGENASSIST(0x08)
call 1f
AESKEYGENASSIST(0x10)
call 1f
AESKEYGENASSIST(0x20)
call 1f
AESKEYGENASSIST(0x40)
call 1f
AESKEYGENASSIST(0x80)
call 1f
AESKEYGENASSIST(0x1b)
call 1f
AESKEYGENASSIST(0x36)
call 1f
#ifdef __i386__
END_PIC()
pop %ebp
#endif
ret
1:
pshufd $0xff, %xmm1, %xmm1
movdqa %xmm0, %xmm2
pslldq $4, %xmm2
pxor %xmm2, %xmm0
pslldq $4, %xmm2
pxor %xmm2, %xmm0
pslldq $4, %xmm2
pxor %xmm2, %xmm0
pxor %xmm1, %xmm0
movdqa %xmm0, (PTR1)
add $16, PTR1
ret
ENDPROC(x86_aes_expand_key)
#if defined(__i386__) && defined(__PIC__)
.section .text.__x86.get_pc_thunk.bx,"axG",@progbits,__x86.get_pc_thunk.bx,comdat
.globl __x86.get_pc_thunk.bx
.hidden __x86.get_pc_thunk.bx
.type __x86.get_pc_thunk.bx, @function
__x86.get_pc_thunk.bx:
movl (%esp), %ebx
ret
#endif
.bss
.balign 64
aes_round_keys:
.space 11*16
.size aes_round_keys, .-aes_round_keys
/*
* This is necessary to inform a linker that this code has IBT (Indirect
* Branch Tracking) feature of the Intel CET (Control-flow Enforcement
* Technology) enabled.
* See: https://gcc.gnu.org/onlinedocs/gcc/Instrumentation-Options.html#index-fcf-protection
*/
#if defined __CET__ && (__CET__ & 1)
.section .note.gnu.property,"a"
.align 8
.long 1f - 0f /* name length */
.long 4f - 1f /* data length */
/* NT_GNU_PROPERTY_TYPE_0 */
.long 5 /* note type */
0:
.string "GNU" /* vendor name */
1:
.align 8
/* GNU_PROPERTY_X86_FEATURE_1_AND */
.long 0xc0000002 /* pr_type */
.long 3f - 2f /* pr_datasz */
2:
/* GNU_PROPERTY_X86_FEATURE_1_XXX */
.long 0x3
3:
.align 8
4:
#endif
/*
* This is necessary to keep the whole executable
* from needing a writable stack.
*/
.section .note.GNU-stack,"",%progbits