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glibc/sysdeps/x86_64/dl-trampoline.S

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/* PLT trampolines. x86-64 version.
Copyright (C) 2004, 2005, 2007, 2009, 2011 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <config.h>
#include <sysdep.h>
#include <link-defines.h>
#if (RTLD_SAVESPACE_SSE % 32) != 0
# error RTLD_SAVESPACE_SSE must be aligned to 32 bytes
#endif
.text
.globl _dl_runtime_resolve
.type _dl_runtime_resolve, @function
.align 16
cfi_startproc
_dl_runtime_resolve:
cfi_adjust_cfa_offset(16) # Incorporate PLT
subq $56,%rsp
cfi_adjust_cfa_offset(56)
movq %rax,(%rsp) # Preserve registers otherwise clobbered.
movq %rcx, 8(%rsp)
movq %rdx, 16(%rsp)
movq %rsi, 24(%rsp)
movq %rdi, 32(%rsp)
movq %r8, 40(%rsp)
movq %r9, 48(%rsp)
movq 64(%rsp), %rsi # Copy args pushed by PLT in register.
movq 56(%rsp), %rdi # %rdi: link_map, %rsi: reloc_index
call _dl_fixup # Call resolver.
movq %rax, %r11 # Save return value
movq 48(%rsp), %r9 # Get register content back.
movq 40(%rsp), %r8
movq 32(%rsp), %rdi
movq 24(%rsp), %rsi
movq 16(%rsp), %rdx
movq 8(%rsp), %rcx
movq (%rsp), %rax
addq $72, %rsp # Adjust stack(PLT did 2 pushes)
cfi_adjust_cfa_offset(-72)
jmp *%r11 # Jump to function address.
cfi_endproc
.size _dl_runtime_resolve, .-_dl_runtime_resolve
#ifndef PROF
.globl _dl_runtime_profile
.type _dl_runtime_profile, @function
.align 16
cfi_startproc
_dl_runtime_profile:
cfi_adjust_cfa_offset(16) # Incorporate PLT
/* The La_x86_64_regs data structure pointed to by the
fourth paramater must be 16-byte aligned. This must
be explicitly enforced. We have the set up a dynamically
sized stack frame. %rbx points to the top half which
has a fixed size and preserves the original stack pointer. */
subq $32, %rsp # Allocate the local storage.
cfi_adjust_cfa_offset(32)
movq %rbx, (%rsp)
cfi_rel_offset(%rbx, 0)
/* On the stack:
56(%rbx) parameter #1
48(%rbx) return address
40(%rbx) reloc index
32(%rbx) link_map
24(%rbx) La_x86_64_regs pointer
16(%rbx) framesize
8(%rbx) rax
(%rbx) rbx
*/
movq %rax, 8(%rsp)
movq %rsp, %rbx
cfi_def_cfa_register(%rbx)
/* Actively align the La_x86_64_regs structure. */
andq $0xfffffffffffffff0, %rsp
# ifdef HAVE_AVX_SUPPORT
/* sizeof(La_x86_64_regs). Need extra space for 8 SSE registers
to detect if any xmm0-xmm7 registers are changed by audit
module. */
subq $(LR_SIZE + XMM_SIZE*8), %rsp
# else
subq $LR_SIZE, %rsp # sizeof(La_x86_64_regs)
# endif
movq %rsp, 24(%rbx)
/* Fill the La_x86_64_regs structure. */
movq %rdx, LR_RDX_OFFSET(%rsp)
movq %r8, LR_R8_OFFSET(%rsp)
movq %r9, LR_R9_OFFSET(%rsp)
movq %rcx, LR_RCX_OFFSET(%rsp)
movq %rsi, LR_RSI_OFFSET(%rsp)
movq %rdi, LR_RDI_OFFSET(%rsp)
movq %rbp, LR_RBP_OFFSET(%rsp)
leaq 48(%rbx), %rax
movq %rax, LR_RSP_OFFSET(%rsp)
/* We always store the XMM registers even if AVX is available.
This is to provide backward binary compatility for existing
audit modules. */
movaps %xmm0, (LR_XMM_OFFSET)(%rsp)
movaps %xmm1, (LR_XMM_OFFSET + XMM_SIZE)(%rsp)
movaps %xmm2, (LR_XMM_OFFSET + XMM_SIZE*2)(%rsp)
movaps %xmm3, (LR_XMM_OFFSET + XMM_SIZE*3)(%rsp)
movaps %xmm4, (LR_XMM_OFFSET + XMM_SIZE*4)(%rsp)
movaps %xmm5, (LR_XMM_OFFSET + XMM_SIZE*5)(%rsp)
movaps %xmm6, (LR_XMM_OFFSET + XMM_SIZE*6)(%rsp)
movaps %xmm7, (LR_XMM_OFFSET + XMM_SIZE*7)(%rsp)
# ifdef HAVE_AVX_SUPPORT
.data
L(have_avx):
.zero 4
.size L(have_avx), 4
.previous
cmpl $0, L(have_avx)(%rip)
jne 1f
movq %rbx, %r11 # Save rbx
movl $1, %eax
cpuid
movq %r11,%rbx # Restore rbx
xorl %eax, %eax
// AVX and XSAVE supported?
andl $((1 << 28) | (1 << 27)), %ecx
cmpl $((1 << 28) | (1 << 27)), %ecx
jne 2f
xorl %ecx, %ecx
// Get XFEATURE_ENABLED_MASK
xgetbv
andl $0x6, %eax
2: subl $0x5, %eax
movl %eax, L(have_avx)(%rip)
cmpl $0, %eax
1: js L(no_avx)
# define RESTORE_AVX
# define MORE_CODE
# include "dl-trampoline.h"
.align 16
L(no_avx):
# endif
# undef RESTORE_AVX
# include "dl-trampoline.h"
cfi_endproc
.size _dl_runtime_profile, .-_dl_runtime_profile
#endif
#ifdef SHARED
.globl _dl_x86_64_save_sse
.type _dl_x86_64_save_sse, @function
.align 16
cfi_startproc
_dl_x86_64_save_sse:
# ifdef HAVE_AVX_SUPPORT
cmpl $0, L(have_avx)(%rip)
jne 1f
movq %rbx, %r11 # Save rbx
movl $1, %eax
cpuid
movq %r11,%rbx # Restore rbx
xorl %eax, %eax
// AVX and XSAVE supported?
andl $((1 << 28) | (1 << 27)), %ecx
cmpl $((1 << 28) | (1 << 27)), %ecx
jne 2f
xorl %ecx, %ecx
// Get XFEATURE_ENABLED_MASK
xgetbv
andl $0x6, %eax
cmpl $0x6, %eax
// Nonzero if SSE and AVX state saving is enabled.
sete %al
2: leal -1(%eax,%eax), %eax
movl %eax, L(have_avx)(%rip)
cmpl $0, %eax
1: js L(no_avx5)
# define YMM_SIZE 32
vmovdqa %ymm0, %fs:RTLD_SAVESPACE_SSE+0*YMM_SIZE
vmovdqa %ymm1, %fs:RTLD_SAVESPACE_SSE+1*YMM_SIZE
vmovdqa %ymm2, %fs:RTLD_SAVESPACE_SSE+2*YMM_SIZE
vmovdqa %ymm3, %fs:RTLD_SAVESPACE_SSE+3*YMM_SIZE
vmovdqa %ymm4, %fs:RTLD_SAVESPACE_SSE+4*YMM_SIZE
vmovdqa %ymm5, %fs:RTLD_SAVESPACE_SSE+5*YMM_SIZE
vmovdqa %ymm6, %fs:RTLD_SAVESPACE_SSE+6*YMM_SIZE
vmovdqa %ymm7, %fs:RTLD_SAVESPACE_SSE+7*YMM_SIZE
ret
L(no_avx5):
# endif
movdqa %xmm0, %fs:RTLD_SAVESPACE_SSE+0*XMM_SIZE
movdqa %xmm1, %fs:RTLD_SAVESPACE_SSE+1*XMM_SIZE
movdqa %xmm2, %fs:RTLD_SAVESPACE_SSE+2*XMM_SIZE
movdqa %xmm3, %fs:RTLD_SAVESPACE_SSE+3*XMM_SIZE
movdqa %xmm4, %fs:RTLD_SAVESPACE_SSE+4*XMM_SIZE
movdqa %xmm5, %fs:RTLD_SAVESPACE_SSE+5*XMM_SIZE
movdqa %xmm6, %fs:RTLD_SAVESPACE_SSE+6*XMM_SIZE
movdqa %xmm7, %fs:RTLD_SAVESPACE_SSE+7*XMM_SIZE
ret
cfi_endproc
.size _dl_x86_64_save_sse, .-_dl_x86_64_save_sse
.globl _dl_x86_64_restore_sse
.type _dl_x86_64_restore_sse, @function
.align 16
cfi_startproc
_dl_x86_64_restore_sse:
# ifdef HAVE_AVX_SUPPORT
cmpl $0, L(have_avx)(%rip)
js L(no_avx6)
vmovdqa %fs:RTLD_SAVESPACE_SSE+0*YMM_SIZE, %ymm0
vmovdqa %fs:RTLD_SAVESPACE_SSE+1*YMM_SIZE, %ymm1
vmovdqa %fs:RTLD_SAVESPACE_SSE+2*YMM_SIZE, %ymm2
vmovdqa %fs:RTLD_SAVESPACE_SSE+3*YMM_SIZE, %ymm3
vmovdqa %fs:RTLD_SAVESPACE_SSE+4*YMM_SIZE, %ymm4
vmovdqa %fs:RTLD_SAVESPACE_SSE+5*YMM_SIZE, %ymm5
vmovdqa %fs:RTLD_SAVESPACE_SSE+6*YMM_SIZE, %ymm6
vmovdqa %fs:RTLD_SAVESPACE_SSE+7*YMM_SIZE, %ymm7
ret
L(no_avx6):
# endif
movdqa %fs:RTLD_SAVESPACE_SSE+0*XMM_SIZE, %xmm0
movdqa %fs:RTLD_SAVESPACE_SSE+1*XMM_SIZE, %xmm1
movdqa %fs:RTLD_SAVESPACE_SSE+2*XMM_SIZE, %xmm2
movdqa %fs:RTLD_SAVESPACE_SSE+3*XMM_SIZE, %xmm3
movdqa %fs:RTLD_SAVESPACE_SSE+4*XMM_SIZE, %xmm4
movdqa %fs:RTLD_SAVESPACE_SSE+5*XMM_SIZE, %xmm5
movdqa %fs:RTLD_SAVESPACE_SSE+6*XMM_SIZE, %xmm6
movdqa %fs:RTLD_SAVESPACE_SSE+7*XMM_SIZE, %xmm7
ret
cfi_endproc
.size _dl_x86_64_restore_sse, .-_dl_x86_64_restore_sse
#endif
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