diff options
Diffstat (limited to 'sysdeps/x86_64/dl-trampoline.h')
| -rw-r--r-- | sysdeps/x86_64/dl-trampoline.h | 291 |
1 files changed, 291 insertions, 0 deletions
diff --git a/sysdeps/x86_64/dl-trampoline.h b/sysdeps/x86_64/dl-trampoline.h new file mode 100644 index 0000000000..d63b7d03c4 --- /dev/null +++ b/sysdeps/x86_64/dl-trampoline.h @@ -0,0 +1,291 @@ +/* Partial PLT profile trampoline to save and restore x86-64 vector + registers. + Copyright (C) 2009 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. */ + + leaq 48(%rbx), %rax + movq %rax, LR_RSP_OFFSET(%rsp) + + /* This is to provide backward binary compatility for existing + audit modules. */ + MOVXMM %xmm0, (LR_XMM_OFFSET)(%rsp) + MOVXMM %xmm1, (LR_XMM_OFFSET + XMM_SIZE)(%rsp) + MOVXMM %xmm2, (LR_XMM_OFFSET + XMM_SIZE*2)(%rsp) + MOVXMM %xmm3, (LR_XMM_OFFSET + XMM_SIZE*3)(%rsp) + MOVXMM %xmm4, (LR_XMM_OFFSET + XMM_SIZE*4)(%rsp) + MOVXMM %xmm5, (LR_XMM_OFFSET + XMM_SIZE*5)(%rsp) + MOVXMM %xmm6, (LR_XMM_OFFSET + XMM_SIZE*6)(%rsp) + MOVXMM %xmm7, (LR_XMM_OFFSET + XMM_SIZE*7)(%rsp) + +#ifdef RESTORE_AVX + /* This is to support AVX audit modules. */ + vmovdqu %ymm0, (LR_VECTOR_OFFSET)(%rsp) + vmovdqu %ymm1, (LR_VECTOR_OFFSET + VECTOR_SIZE)(%rsp) + vmovdqu %ymm2, (LR_VECTOR_OFFSET + VECTOR_SIZE*2)(%rsp) + vmovdqu %ymm3, (LR_VECTOR_OFFSET + VECTOR_SIZE*3)(%rsp) + vmovdqu %ymm4, (LR_VECTOR_OFFSET + VECTOR_SIZE*4)(%rsp) + vmovdqu %ymm5, (LR_VECTOR_OFFSET + VECTOR_SIZE*5)(%rsp) + vmovdqu %ymm6, (LR_VECTOR_OFFSET + VECTOR_SIZE*6)(%rsp) + vmovdqu %ymm7, (LR_VECTOR_OFFSET + VECTOR_SIZE*7)(%rsp) + + /* Save xmm0-xmm7 registers to detect if any of them are + changed by audit module. */ + vmovdqa %xmm0, (LR_SIZE)(%rsp) + vmovdqa %xmm1, (LR_SIZE + XMM_SIZE)(%rsp) + vmovdqa %xmm2, (LR_SIZE + XMM_SIZE*2)(%rsp) + vmovdqa %xmm3, (LR_SIZE + XMM_SIZE*3)(%rsp) + vmovdqa %xmm4, (LR_SIZE + XMM_SIZE*4)(%rsp) + vmovdqa %xmm5, (LR_SIZE + XMM_SIZE*5)(%rsp) + vmovdqa %xmm6, (LR_SIZE + XMM_SIZE*6)(%rsp) + vmovdqa %xmm7, (LR_SIZE + XMM_SIZE*7)(%rsp) +#endif + + movq %rsp, %rcx # La_x86_64_regs pointer to %rcx. + movq 48(%rbx), %rdx # Load return address if needed. + movq 40(%rbx), %rsi # Copy args pushed by PLT in register. + movq 32(%rbx), %rdi # %rdi: link_map, %rsi: reloc_index + leaq 16(%rbx), %r8 + call _dl_profile_fixup # Call resolver. + + movq %rax, %r11 # Save return value. + + movq 8(%rbx), %rax # Get back register content. + movq LR_RDX_OFFSET(%rsp), %rdx + movq LR_R8_OFFSET(%rsp), %r8 + movq LR_R9_OFFSET(%rsp), %r9 + +#ifdef RESTORE_AVX + /* Check if any xmm0-xmm7 registers are changed by audit + module. */ + vmovdqa (LR_XMM_OFFSET)(%rsp), %xmm0 + vpcmpeqq (LR_SIZE)(%rsp), %xmm0, %xmm1 + vpmovmskb %xmm1, %esi + cmpl $0xffff, %esi + jne 1f + + vmovdqa (LR_XMM_OFFSET + XMM_SIZE)(%rsp), %xmm0 + vpcmpeqq (LR_SIZE + XMM_SIZE)(%rsp), %xmm0, %xmm1 + vpmovmskb %xmm1, %esi + cmpl $0xffff, %esi + jne 1f + + vmovdqa (LR_XMM_OFFSET + XMM_SIZE*2)(%rsp), %xmm0 + vpcmpeqq (LR_SIZE + XMM_SIZE*2)(%rsp), %xmm0, %xmm1 + vpmovmskb %xmm1, %esi + cmpl $0xffff, %esi + jne 1f + + vmovdqa (LR_XMM_OFFSET + XMM_SIZE*3)(%rsp), %xmm0 + vpcmpeqq (LR_SIZE + XMM_SIZE*3)(%rsp), %xmm0, %xmm1 + vpmovmskb %xmm1, %esi + cmpl $0xffff, %esi + jne 1f + + vmovdqa (LR_XMM_OFFSET + XMM_SIZE*4)(%rsp), %xmm0 + vpcmpeqq (LR_SIZE + XMM_SIZE*4)(%rsp), %xmm0, %xmm1 + vpmovmskb %xmm1, %esi + cmpl $0xffff, %esi + jne 1f + + vmovdqa (LR_XMM_OFFSET + XMM_SIZE*5)(%rsp), %xmm0 + vpcmpeqq (LR_SIZE + XMM_SIZE*5)(%rsp), %xmm0, %xmm1 + vpmovmskb %xmm1, %esi + cmpl $0xffff, %esi + jne 1f + + vmovdqa (LR_XMM_OFFSET + XMM_SIZE*6)(%rsp), %xmm0 + vpcmpeqq (LR_SIZE + XMM_SIZE*6)(%rsp), %xmm0, %xmm1 + vpmovmskb %xmm1, %esi + cmpl $0xffff, %esi + jne 1f + + vmovdqa (LR_XMM_OFFSET + XMM_SIZE*7)(%rsp), %xmm0 + vpcmpeqq (LR_SIZE + XMM_SIZE*7)(%rsp), %xmm0, %xmm1 + vpmovmskb %xmm1, %esi + cmpl $0xffff, %esi + jne 1f + + /* We restore AVX registers only if xmm0-xmm7 registers are + unchanged. */ + vmovdqu (LR_VECTOR_OFFSET)(%rsp), %ymm0 + vmovdqu (LR_VECTOR_OFFSET + VECTOR_SIZE)(%rsp), %ymm1 + vmovdqu (LR_VECTOR_OFFSET + VECTOR_SIZE*2)(%rsp), %ymm2 + vmovdqu (LR_VECTOR_OFFSET + VECTOR_SIZE*3)(%rsp), %ymm3 + vmovdqu (LR_VECTOR_OFFSET + VECTOR_SIZE*4)(%rsp), %ymm4 + vmovdqu (LR_VECTOR_OFFSET + VECTOR_SIZE*5)(%rsp), %ymm5 + vmovdqu (LR_VECTOR_OFFSET + VECTOR_SIZE*6)(%rsp), %ymm6 + vmovdqu (LR_VECTOR_OFFSET + VECTOR_SIZE*7)(%rsp), %ymm7 + jmp 2f + +1: + vmovdqa (LR_XMM_OFFSET)(%rsp), %xmm0 + vmovdqa (LR_XMM_OFFSET + XMM_SIZE)(%rsp), %xmm1 + vmovdqa (LR_XMM_OFFSET + XMM_SIZE*2)(%rsp), %xmm2 + vmovdqa (LR_XMM_OFFSET + XMM_SIZE*3)(%rsp), %xmm3 + vmovdqa (LR_XMM_OFFSET + XMM_SIZE*4)(%rsp), %xmm4 + vmovdqa (LR_XMM_OFFSET + XMM_SIZE*5)(%rsp), %xmm5 + vmovdqa (LR_XMM_OFFSET + XMM_SIZE*6)(%rsp), %xmm6 + vmovdqa (LR_XMM_OFFSET + XMM_SIZE*7)(%rsp), %xmm7 + +2: +#else + movaps (LR_XMM_OFFSET)(%rsp), %xmm0 + movaps (LR_XMM_OFFSET + XMM_SIZE)(%rsp), %xmm1 + movaps (LR_XMM_OFFSET + XMM_SIZE*2)(%rsp), %xmm2 + movaps (LR_XMM_OFFSET + XMM_SIZE*3)(%rsp), %xmm3 + movaps (LR_XMM_OFFSET + XMM_SIZE*4)(%rsp), %xmm4 + movaps (LR_XMM_OFFSET + XMM_SIZE*5)(%rsp), %xmm5 + movaps (LR_XMM_OFFSET + XMM_SIZE*6)(%rsp), %xmm6 + movaps (LR_XMM_OFFSET + XMM_SIZE*7)(%rsp), %xmm7 +#endif + + movq 16(%rbx), %r10 # Anything in framesize? + testq %r10, %r10 + jns 3f + + /* There's nothing in the frame size, so there + will be no call to the _dl_call_pltexit. */ + + /* Get back registers content. */ + movq LR_RCX_OFFSET(%rsp), %rcx + movq LR_RSI_OFFSET(%rsp), %rsi + movq LR_RDI_OFFSET(%rsp), %rdi + + movq %rbx, %rsp + movq (%rsp), %rbx + cfi_restore(rbx) + cfi_def_cfa_register(%rsp) + + addq $48, %rsp # Adjust the stack to the return value + # (eats the reloc index and link_map) + cfi_adjust_cfa_offset(-48) + jmp *%r11 # Jump to function address. + +3: + cfi_adjust_cfa_offset(48) + cfi_rel_offset(%rbx, 0) + cfi_def_cfa_register(%rbx) + + /* At this point we need to prepare new stack for the function + which has to be called. We copy the original stack to a + temporary buffer of the size specified by the 'framesize' + returned from _dl_profile_fixup */ + + leaq LR_RSP_OFFSET(%rbx), %rsi # stack + addq $8, %r10 + andq $0xfffffffffffffff0, %r10 + movq %r10, %rcx + subq %r10, %rsp + movq %rsp, %rdi + shrq $3, %rcx + rep + movsq + + movq 24(%rdi), %rcx # Get back register content. + movq 32(%rdi), %rsi + movq 40(%rdi), %rdi + + call *%r11 + + mov 24(%rbx), %rsp # Drop the copied stack content + + /* Now we have to prepare the La_x86_64_retval structure for the + _dl_call_pltexit. The La_x86_64_regs is being pointed by rsp now, + so we just need to allocate the sizeof(La_x86_64_retval) space on + the stack, since the alignment has already been taken care of. */ +#ifdef RESTORE_AVX + /* sizeof(La_x86_64_retval). Need extra space for 2 SSE + registers to detect if xmm0/xmm1 registers are changed + by audit module. */ + subq $(LRV_SIZE + XMM_SIZE*2), %rsp +#else + subq $LRV_SIZE, %rsp # sizeof(La_x86_64_retval) +#endif + movq %rsp, %rcx # La_x86_64_retval argument to %rcx. + + /* Fill in the La_x86_64_retval structure. */ + movq %rax, LRV_RAX_OFFSET(%rcx) + movq %rdx, LRV_RDX_OFFSET(%rcx) + + MOVXMM %xmm0, LRV_XMM0_OFFSET(%rcx) + MOVXMM %xmm1, LRV_XMM1_OFFSET(%rcx) + +#ifdef RESTORE_AVX + /* This is to support AVX audit modules. */ + vmovdqu %ymm0, LRV_VECTOR0_OFFSET(%rcx) + vmovdqu %ymm1, LRV_VECTOR1_OFFSET(%rcx) + + /* Save xmm0/xmm1 registers to detect if they are changed + by audit module. */ + vmovdqa %xmm0, (LRV_SIZE)(%rcx) + vmovdqa %xmm1, (LRV_SIZE + XMM_SIZE)(%rcx) +#endif + + fstpt LRV_ST0_OFFSET(%rcx) + fstpt LRV_ST1_OFFSET(%rcx) + + movq 24(%rbx), %rdx # La_x86_64_regs argument to %rdx. + movq 40(%rbx), %rsi # Copy args pushed by PLT in register. + movq 32(%rbx), %rdi # %rdi: link_map, %rsi: reloc_index + call _dl_call_pltexit + + /* Restore return registers. */ + movq LRV_RAX_OFFSET(%rsp), %rax + movq LRV_RDX_OFFSET(%rsp), %rdx + +#ifdef RESTORE_AVX + /* Check if xmm0/xmm1 registers are changed by audit module. */ + vmovdqa LRV_XMM0_OFFSET(%rsp), %xmm0 + vpcmpeqq (LRV_SIZE)(%rsp), %xmm0, %xmm1 + vpmovmskb %xmm1, %esi + cmpl $0xffff, %esi + jne 4f + + /* We restore AVX registers only if xmm0/xmm1 registers are + unchanged. */ + vmovdqa LRV_XMM1_OFFSET(%rsp), %xmm0 + vpcmpeqq (LRV_SIZE + XMM_SIZE)(%rsp), %xmm0, %xmm1 + vpmovmskb %xmm1, %esi + cmpl $0xffff, %esi + jne 4f + + vmovdqu LRV_VECTOR0_OFFSET(%rsp), %ymm0 + vmovdqu LRV_VECTOR1_OFFSET(%rsp), %ymm1 + jmp 5f + +4: + vmovdqa LRV_XMM0_OFFSET(%rsp), %xmm0 + vmovdqa LRV_XMM1_OFFSET(%rsp), %xmm1 +5: +#else + movaps LRV_XMM0_OFFSET(%rsp), %xmm0 + movaps LRV_XMM1_OFFSET(%rsp), %xmm1 +#endif + + fldt LRV_ST0_OFFSET(%rsp) + fldt LRV_ST0_OFFSET(%rsp) + + movq %rbx, %rsp + movq (%rsp), %rbx + cfi_restore(rbx) + cfi_def_cfa_register(%rsp) + + addq $48, %rsp # Adjust the stack to the return value + # (eats the reloc index and link_map) + cfi_adjust_cfa_offset(-48) + retq |