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49551d7c29
Fixes GH-10398 The stack was misaligned upon entering the trampoline function [1], this causes a CPU trap when the SSE instruction is executed to copy data from the stack. This was fixed upstream [2]. This commit syncs all upstream changes from the boost/context assembly files to our copy. [1] https://github.com/php/php-src/pull/10407#issuecomment-1404180877 [2] https://github.com/boostorg/context/pull/219 Closes GH-10407.
94 lines
3.7 KiB
ArmAsm
94 lines
3.7 KiB
ArmAsm
/*
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Copyright Oliver Kowalke 2009.
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE_1_0.txt or copy at
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http://www.boost.org/LICENSE_1_0.txt)
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*/
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/****************************************************************************************
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* *
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* ---------------------------------------------------------------------------------- *
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* | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | *
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* ---------------------------------------------------------------------------------- *
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* | 0x0 | 0x4 | 0x8 | 0xc | 0x10 | 0x14 | 0x18 | 0x1c | *
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* ---------------------------------------------------------------------------------- *
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* | fc_mxcsr|fc_x87_cw| guard | EDI | ESI | EBX | EBP | EIP | *
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* ---------------------------------------------------------------------------------- *
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* ---------------------------------------------------------------------------------- *
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* | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | *
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* ---------------------------------------------------------------------------------- *
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* | 0x20 | 0x24 | 0x28 | | *
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* ---------------------------------------------------------------------------------- *
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* | hidden | to | data | | *
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* ---------------------------------------------------------------------------------- *
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* *
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****************************************************************************************/
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.file "jump_i386_sysv_elf_gas.S"
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.text
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.globl jump_fcontext
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.align 2
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.type jump_fcontext,@function
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jump_fcontext:
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leal -0x1c(%esp), %esp /* prepare stack */
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#if !defined(BOOST_USE_TSX)
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stmxcsr (%esp) /* save MMX control- and status-word */
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fnstcw 0x4(%esp) /* save x87 control-word */
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#endif
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#if defined(BOOST_CONTEXT_TLS_STACK_PROTECTOR)
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movl %gs:0x14, %ecx /* read stack guard from TLS record */
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movl %ecx, 0x8(%esp) /* save stack guard */
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#endif
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movl %edi, 0xc(%esp) /* save EDI */
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movl %esi, 0x10(%esp) /* save ESI */
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movl %ebx, 0x14(%esp) /* save EBX */
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movl %ebp, 0x18(%esp) /* save EBP */
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/* store ESP (pointing to context-data) in ECX */
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movl %esp, %ecx
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/* first arg of jump_fcontext() == fcontext to jump to */
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movl 0x24(%esp), %eax
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/* second arg of jump_fcontext() == data to be transferred */
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movl 0x28(%esp), %edx
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/* restore ESP (pointing to context-data) from EAX */
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movl %eax, %esp
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/* address of returned transport_t */
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movl 0x20(%esp), %eax
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/* return parent fcontext_t */
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movl %ecx, (%eax)
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/* return data */
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movl %edx, 0x4(%eax)
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movl 0x1c(%esp), %ecx /* restore EIP */
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#if !defined(BOOST_USE_TSX)
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ldmxcsr (%esp) /* restore MMX control- and status-word */
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fldcw 0x4(%esp) /* restore x87 control-word */
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#endif
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#if defined(BOOST_CONTEXT_TLS_STACK_PROTECTOR)
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movl 0x8(%esp), %edx /* load stack guard */
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movl %edx, %gs:0x14 /* restore stack guard to TLS record */
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#endif
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movl 0xc(%esp), %edi /* restore EDI */
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movl 0x10(%esp), %esi /* restore ESI */
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movl 0x14(%esp), %ebx /* restore EBX */
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movl 0x18(%esp), %ebp /* restore EBP */
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leal 0x24(%esp), %esp /* prepare stack */
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/* jump to context */
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jmp *%ecx
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.size jump_fcontext,.-jump_fcontext
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/* Mark that we don't need executable stack. */
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.section .note.GNU-stack,"",%progbits
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