diff options
Diffstat (limited to 'sysdeps/x86_64/dl-trampoline.S')
| -rw-r--r-- | sysdeps/x86_64/dl-trampoline.S | 239 |
1 files changed, 140 insertions, 99 deletions
diff --git a/sysdeps/x86_64/dl-trampoline.S b/sysdeps/x86_64/dl-trampoline.S index 3e2d182758..c9be759e37 100644 --- a/sysdeps/x86_64/dl-trampoline.S +++ b/sysdeps/x86_64/dl-trampoline.S @@ -1,5 +1,5 @@ /* PLT trampolines. x86-64 version. - Copyright (C) 2004, 2005, 2007 Free Software Foundation, Inc. + Copyright (C) 2004, 2005, 2007, 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 @@ -61,132 +61,173 @@ _dl_runtime_resolve: .type _dl_runtime_profile, @function .align 16 cfi_startproc + _dl_runtime_profile: - subq $88, %rsp - cfi_adjust_cfa_offset(104) # Incorporate PLT - movq %rax, (%rsp) # Preserve registers otherwise clobbered. - movq %rdx, 8(%rsp) - movq %r8, 16(%rsp) - movq %r9, 24(%rsp) - movq %rcx, 32(%rsp) - movq %rsi, 40(%rsp) - movq %rdi, 48(%rsp) - movq %rbp, 56(%rsp) # Information for auditors. - leaq 104(%rsp), %rax - movq %rax, 64(%rsp) - leaq 8(%rsp), %rcx - movq 104(%rsp), %rdx # Load return address if needed - movq 96(%rsp), %rsi # Copy args pushed by PLT in register. - movq %rsi,%r11 # Multiply by 24 + /* 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(48) # Incorporate PLT + 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 + subq $192, %rsp # sizeof(La_x86_64_regs) + movq %rsp, 24(%rbx) + + movq %rdx, (%rsp) # Fill the La_x86_64_regs structure. + movq %r8, 8(%rsp) + movq %r9, 16(%rsp) + movq %rcx, 24(%rsp) + movq %rsi, 32(%rsp) + movq %rdi, 40(%rsp) + movq %rbp, 48(%rsp) + leaq 48(%rbx), %rax + movq %rax, 56(%rsp) + movaps %xmm0, 64(%rsp) + movaps %xmm1, 80(%rsp) + movaps %xmm2, 96(%rsp) + movaps %xmm3, 112(%rsp) + movaps %xmm4, 128(%rsp) + movaps %xmm5, 144(%rsp) + movaps %xmm7, 160(%rsp) + + 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 %rsi,%r11 # Multiply by 24. addq %r11,%rsi addq %r11,%rsi shlq $3, %rsi - movq 88(%rsp), %rdi # %rdi: link_map, %rsi: reloc_offset - leaq 72(%rsp), %r8 + movq 32(%rbx), %rdi # %rdi: link_map, %rsi: reloc_offset + leaq 16(%rbx), %r8 call _dl_profile_fixup # Call resolver. - movq %rax, %r11 # Save return value - movq 8(%rsp), %rdx # Get back register content. - movq 16(%rsp), %r8 - movq 24(%rsp), %r9 - movq (%rsp),%rax - movq 72(%rsp), %r10 + + movq %rax, %r11 # Save return value. + + movq 8(%rbx), %rax # Get back register content. + movq (%rsp), %rdx + movq 8(%rsp), %r8 + movq 16(%rsp), %r9 + movaps 64(%rsp), %xmm0 + movaps 80(%rsp), %xmm1 + movaps 96(%rsp), %xmm2 + movaps 112(%rsp), %xmm3 + movaps 128(%rsp), %xmm4 + movaps 144(%rsp), %xmm5 + movaps 160(%rsp), %xmm7 + + movq 16(%rbx), %r10 # Anything in framesize? testq %r10, %r10 jns 1f - movq 32(%rsp), %rcx - movq 40(%rsp), %rsi - movq 48(%rsp), %rdi - addq $104,%rsp # Adjust stack - cfi_adjust_cfa_offset (-104) + + /* There's nothing in the frame size, so there + will be no call to the _dl_call_pltexit. */ + + movq 24(%rsp), %rcx # Get back registers content. + movq 32(%rsp), %rsi + movq 40(%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. - /* - +104 return address - +96 PLT2 - +88 PLT1 - +80 free - +72 free - +64 %rsp - +56 %rbp - +48 %rdi - +40 %rsi - +32 %rcx - +24 %r9 - +16 %r8 - +8 %rdx - %rsp %rax - */ - cfi_adjust_cfa_offset (104) -1: movq %rbx, 72(%rsp) - cfi_rel_offset (rbx, 72) - leaq 112(%rsp), %rsi - movq %rsp, %rbx - cfi_def_cfa_register (%rbx) - movq %r10, %rcx +1: + 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 56(%rbx), %rsi # stack addq $8, %r10 andq $0xfffffffffffffff0, %r10 + movq %r10, %rcx subq %r10, %rsp movq %rsp, %rdi shrq $3, %rcx rep movsq - movq 32(%rbx), %rcx - movq 40(%rbx), %rsi - movq 48(%rbx), %rdi + + movq 24(%rdi), %rcx # Get back register content. + movq 32(%rdi), %rsi + movq 40(%rdi), %rdi + call *%r11 - movq %rbx, %rsp - cfi_def_cfa_register (%rsp) - subq $72, %rsp - cfi_adjust_cfa_offset (72) - movq %rsp, %rcx - movq %rax, (%rcx) + + 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. */ + + subq $80, %rsp # sizeof(La_x86_64_retval) + movq %rsp, %rcx # La_x86_64_retval argument to %rcx. + + movq %rax, (%rcx) # Fill in the La_x86_64_retval structure. movq %rdx, 8(%rcx) - /* Even though the stack is correctly aligned to allow using movaps - we use movups. Some callers might provide an incorrectly aligned - stack and we do not want to have it blow up here. */ - movups %xmm0, 16(%rcx) - movups %xmm1, 32(%rcx) + movaps %xmm0, 16(%rcx) + movaps %xmm1, 32(%rcx) fstpt 48(%rcx) fstpt 64(%rcx) - /* - +176 return address - +168 PLT2 - +160 PLT1 - +152 free - +144 free - +136 %rsp - +128 %rbp - +120 %rdi - +112 %rsi - +104 %rcx - +96 %r9 - +88 %r8 - +80 %rdx - +64 %st1 result - +48 %st result - +32 %xmm1 result - +16 %xmm0 result - +8 %rdx result - %rsp %rax result - */ - leaq 80(%rsp), %rdx - movq 144(%rsp), %rbx - cfi_restore (rbx) - movq 168(%rsp), %rsi # Copy args pushed by PLT in register. - movq %rsi,%r11 # Multiply by 24 + + movq 24(%rbx), %rdx # La_x86_64_regs argument to %rdx. + movq 40(%rbx), %rsi # Copy args pushed by PLT in register. + movq %rsi,%r11 # Multiply by 24. addq %r11,%rsi addq %r11,%rsi shlq $3, %rsi - movq 160(%rsp), %rdi # %rdi: link_map, %rsi: reloc_offset + movq 32(%rbx), %rdi # %rdi: link_map, %rsi: reloc_offset call _dl_call_pltexit - movq (%rsp), %rax + + movq (%rsp), %rax # Restore return registers. movq 8(%rsp), %rdx - movups 16(%rsp), %xmm0 - movups 32(%rsp), %xmm1 + movaps 16(%rsp), %xmm0 + movaps 32(%rsp), %xmm1 fldt 64(%rsp) fldt 48(%rsp) - addq $176, %rsp - cfi_adjust_cfa_offset (-176) + + 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 + cfi_endproc .size _dl_runtime_profile, .-_dl_runtime_profile #endif |