/* 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, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #include #include #include .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 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_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