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// libcontext - a slightly more portable version of boost::context
// Copyright Martin Husemann 2013.
// Copyright Oliver Kowalke 2009.
// Copyright Sergue E. Leontiev 2013.
// Copyright Thomas Sailer 2013.
// Minor modifications by Tomasz Wlostowski 2016.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#include "bthread/context.h"
#if defined(BTHREAD_CONTEXT_PLATFORM_windows_i386) && defined(BTHREAD_CONTEXT_COMPILER_gcc)
__asm (
".text\n"
".p2align 4,,15\n"
".globl _bthread_jump_fcontext\n"
".def _bthread_jump_fcontext; .scl 2; .type 32; .endef\n"
"_bthread_jump_fcontext:\n"
" mov 0x10(%esp),%ecx\n"
" push %ebp\n"
" push %ebx\n"
" push %esi\n"
" push %edi\n"
" mov %fs:0x18,%edx\n"
" mov (%edx),%eax\n"
" push %eax\n"
" mov 0x4(%edx),%eax\n"
" push %eax\n"
" mov 0x8(%edx),%eax\n"
" push %eax\n"
" mov 0xe0c(%edx),%eax\n"
" push %eax\n"
" mov 0x10(%edx),%eax\n"
" push %eax\n"
" lea -0x8(%esp),%esp\n"
" test %ecx,%ecx\n"
" je nxt1\n"
" stmxcsr (%esp)\n"
" fnstcw 0x4(%esp)\n"
"nxt1:\n"
" mov 0x30(%esp),%eax\n"
" mov %esp,(%eax)\n"
" mov 0x34(%esp),%edx\n"
" mov 0x38(%esp),%eax\n"
" mov %edx,%esp\n"
" test %ecx,%ecx\n"
" je nxt2\n"
" ldmxcsr (%esp)\n"
" fldcw 0x4(%esp)\n"
"nxt2:\n"
" lea 0x8(%esp),%esp\n"
" mov %fs:0x18,%edx\n"
" pop %ecx\n"
" mov %ecx,0x10(%edx)\n"
" pop %ecx\n"
" mov %ecx,0xe0c(%edx)\n"
" pop %ecx\n"
" mov %ecx,0x8(%edx)\n"
" pop %ecx\n"
" mov %ecx,0x4(%edx)\n"
" pop %ecx\n"
" mov %ecx,(%edx)\n"
" pop %edi\n"
" pop %esi\n"
" pop %ebx\n"
" pop %ebp\n"
" pop %edx\n"
" mov %eax,0x4(%esp)\n"
" jmp *%edx\n"
);
#endif
#if defined(BTHREAD_CONTEXT_PLATFORM_windows_i386) && defined(BTHREAD_CONTEXT_COMPILER_gcc)
__asm (
".text\n"
".p2align 4,,15\n"
".globl _bthread_make_fcontext\n"
".def _bthread_make_fcontext; .scl 2; .type 32; .endef\n"
"_bthread_make_fcontext:\n"
"mov 0x4(%esp),%eax\n"
"lea -0x8(%eax),%eax\n"
"and $0xfffffff0,%eax\n"
"lea -0x3c(%eax),%eax\n"
"mov 0x4(%esp),%ecx\n"
"mov %ecx,0x14(%eax)\n"
"mov 0x8(%esp),%edx\n"
"neg %edx\n"
"lea (%ecx,%edx,1),%ecx\n"
"mov %ecx,0x10(%eax)\n"
"mov %ecx,0xc(%eax)\n"
"mov 0xc(%esp),%ecx\n"
"mov %ecx,0x2c(%eax)\n"
"stmxcsr (%eax)\n"
"fnstcw 0x4(%eax)\n"
"mov $finish,%ecx\n"
"mov %ecx,0x30(%eax)\n"
"mov %fs:0x0,%ecx\n"
"walk:\n"
"mov (%ecx),%edx\n"
"inc %edx\n"
"je found\n"
"dec %edx\n"
"xchg %edx,%ecx\n"
"jmp walk\n"
"found:\n"
"mov 0x4(%ecx),%ecx\n"
"mov %ecx,0x3c(%eax)\n"
"mov $0xffffffff,%ecx\n"
"mov %ecx,0x38(%eax)\n"
"lea 0x38(%eax),%ecx\n"
"mov %ecx,0x18(%eax)\n"
"ret\n"
"finish:\n"
"xor %eax,%eax\n"
"mov %eax,(%esp)\n"
"call _exit\n"
"hlt\n"
".def __exit; .scl 2; .type 32; .endef \n"
);
#endif
#if defined(BTHREAD_CONTEXT_PLATFORM_windows_x86_64) && defined(BTHREAD_CONTEXT_COMPILER_gcc)
__asm (
".text\n"
".p2align 4,,15\n"
".globl bthread_jump_fcontext\n"
".def bthread_jump_fcontext; .scl 2; .type 32; .endef\n"
".seh_proc bthread_jump_fcontext\n"
"bthread_jump_fcontext:\n"
".seh_endprologue\n"
" push %rbp\n"
" push %rbx\n"
" push %rsi\n"
" push %rdi\n"
" push %r15\n"
" push %r14\n"
" push %r13\n"
" push %r12\n"
" mov %gs:0x30,%r10\n"
" mov 0x8(%r10),%rax\n"
" push %rax\n"
" mov 0x10(%r10),%rax\n"
" push %rax\n"
" mov 0x1478(%r10),%rax\n"
" push %rax\n"
" mov 0x18(%r10),%rax\n"
" push %rax\n"
" lea -0xa8(%rsp),%rsp\n"
" test %r9,%r9\n"
" je nxt1\n"
" stmxcsr 0xa0(%rsp)\n"
" fnstcw 0xa4(%rsp)\n"
" movaps %xmm6,(%rsp)\n"
" movaps %xmm7,0x10(%rsp)\n"
" movaps %xmm8,0x20(%rsp)\n"
" movaps %xmm9,0x30(%rsp)\n"
" movaps %xmm10,0x40(%rsp)\n"
" movaps %xmm11,0x50(%rsp)\n"
" movaps %xmm12,0x60(%rsp)\n"
" movaps %xmm13,0x70(%rsp)\n"
" movaps %xmm14,0x80(%rsp)\n"
" movaps %xmm15,0x90(%rsp)\n"
"nxt1:\n"
" xor %r10,%r10\n"
" push %r10\n"
" mov %rsp,(%rcx)\n"
" mov %rdx,%rsp\n"
" pop %r10\n"
" test %r9,%r9\n"
" je nxt2\n"
" ldmxcsr 0xa0(%rsp)\n"
" fldcw 0xa4(%rsp)\n"
" movaps (%rsp),%xmm6\n"
" movaps 0x10(%rsp),%xmm7\n"
" movaps 0x20(%rsp),%xmm8\n"
" movaps 0x30(%rsp),%xmm9\n"
" movaps 0x40(%rsp),%xmm10\n"
" movaps 0x50(%rsp),%xmm11\n"
" movaps 0x60(%rsp),%xmm12\n"
" movaps 0x70(%rsp),%xmm13\n"
" movaps 0x80(%rsp),%xmm14\n"
" movaps 0x90(%rsp),%xmm15\n"
"nxt2:\n"
" mov $0xa8,%rcx\n"
" test %r10,%r10\n"
" je nxt3\n"
" add $0x8,%rcx\n"
"nxt3:\n"
" lea (%rsp,%rcx,1),%rsp\n"
" mov %gs:0x30,%r10\n"
" pop %rax\n"
" mov %rax,0x18(%r10)\n"
" pop %rax\n"
" mov %rax,0x1478(%r10)\n"
" pop %rax\n"
" mov %rax,0x10(%r10)\n"
" pop %rax\n"
" mov %rax,0x8(%r10)\n"
" pop %r12\n"
" pop %r13\n"
" pop %r14\n"
" pop %r15\n"
" pop %rdi\n"
" pop %rsi\n"
" pop %rbx\n"
" pop %rbp\n"
" pop %r10\n"
" mov %r8,%rax\n"
" mov %r8,%rcx\n"
" jmpq *%r10\n"
".seh_endproc\n"
);
#endif
#if defined(BTHREAD_CONTEXT_PLATFORM_windows_x86_64) && defined(BTHREAD_CONTEXT_COMPILER_gcc)
__asm (
".text\n"
".p2align 4,,15\n"
".globl bthread_make_fcontext\n"
".def bthread_make_fcontext; .scl 2; .type 32; .endef\n"
".seh_proc bthread_make_fcontext\n"
"bthread_make_fcontext:\n"
".seh_endprologue\n"
"mov %rcx,%rax\n"
"sub $0x28,%rax\n"
"and $0xfffffffffffffff0,%rax\n"
"sub $0x128,%rax\n"
"mov %r8,0x118(%rax)\n"
"mov %rcx,0xd0(%rax)\n"
"neg %rdx\n"
"lea (%rcx,%rdx,1),%rcx\n"
"mov %rcx,0xc8(%rax)\n"
"mov %rcx,0xc0(%rax)\n"
"stmxcsr 0xa8(%rax)\n"
"fnstcw 0xac(%rax)\n"
"leaq finish(%rip), %rcx\n"
"mov %rcx,0x120(%rax)\n"
"mov $0x1,%rcx\n"
"mov %rcx,(%rax)\n"
"retq\n"
"finish:\n"
"xor %rcx,%rcx\n"
"callq 0x63\n"
"hlt\n"
" .seh_endproc\n"
".def _exit; .scl 2; .type 32; .endef \n"
);
#endif
#if defined(BTHREAD_CONTEXT_PLATFORM_linux_i386) && defined(BTHREAD_CONTEXT_COMPILER_gcc)
__asm (
".text\n"
".globl bthread_jump_fcontext\n"
".align 2\n"
".type bthread_jump_fcontext,@function\n"
"bthread_jump_fcontext:\n"
" movl 0x10(%esp), %ecx\n"
" pushl %ebp \n"
" pushl %ebx \n"
" pushl %esi \n"
" pushl %edi \n"
" leal -0x8(%esp), %esp\n"
" test %ecx, %ecx\n"
" je 1f\n"
" stmxcsr (%esp)\n"
" fnstcw 0x4(%esp)\n"
"1:\n"
" movl 0x1c(%esp), %eax\n"
" movl %esp, (%eax)\n"
" movl 0x20(%esp), %edx\n"
" movl 0x24(%esp), %eax\n"
" movl %edx, %esp\n"
" test %ecx, %ecx\n"
" je 2f\n"
" ldmxcsr (%esp)\n"
" fldcw 0x4(%esp)\n"
"2:\n"
" leal 0x8(%esp), %esp\n"
" popl %edi \n"
" popl %esi \n"
" popl %ebx \n"
" popl %ebp \n"
" popl %edx\n"
" movl %eax, 0x4(%esp)\n"
" jmp *%edx\n"
".size bthread_jump_fcontext,.-bthread_jump_fcontext\n"
".section .note.GNU-stack,\"\",%progbits\n"
);
#endif
#if defined(BTHREAD_CONTEXT_PLATFORM_linux_i386) && defined(BTHREAD_CONTEXT_COMPILER_gcc)
__asm (
".text\n"
".globl bthread_make_fcontext\n"
".align 2\n"
".type bthread_make_fcontext,@function\n"
"bthread_make_fcontext:\n"
" movl 0x4(%esp), %eax\n"
" leal -0x8(%eax), %eax\n"
" andl $-16, %eax\n"
" leal -0x20(%eax), %eax\n"
" movl 0xc(%esp), %edx\n"
" movl %edx, 0x18(%eax)\n"
" stmxcsr (%eax)\n"
" fnstcw 0x4(%eax)\n"
" call 1f\n"
"1: popl %ecx\n"
" addl $finish-1b, %ecx\n"
" movl %ecx, 0x1c(%eax)\n"
" ret \n"
"finish:\n"
" call 2f\n"
"2: popl %ebx\n"
" addl $_GLOBAL_OFFSET_TABLE_+[.-2b], %ebx\n"
" xorl %eax, %eax\n"
" movl %eax, (%esp)\n"
" call _exit@PLT\n"
" hlt\n"
".size bthread_make_fcontext,.-bthread_make_fcontext\n"
".section .note.GNU-stack,\"\",%progbits\n"
);
#endif
#if defined(BTHREAD_CONTEXT_PLATFORM_linux_x86_64) && defined(BTHREAD_CONTEXT_COMPILER_gcc)
__asm (
".text\n"
".globl bthread_jump_fcontext\n"
".type bthread_jump_fcontext,@function\n"
".align 16\n"
"bthread_jump_fcontext:\n"
" pushq %rbp \n"
" pushq %rbx \n"
" pushq %r15 \n"
" pushq %r14 \n"
" pushq %r13 \n"
" pushq %r12 \n"
" leaq -0x8(%rsp), %rsp\n"
" cmp $0, %rcx\n"
" je 1f\n"
" stmxcsr (%rsp)\n"
" fnstcw 0x4(%rsp)\n"
"1:\n"
" movq %rsp, (%rdi)\n"
" movq %rsi, %rsp\n"
" cmp $0, %rcx\n"
" je 2f\n"
" ldmxcsr (%rsp)\n"
" fldcw 0x4(%rsp)\n"
"2:\n"
" leaq 0x8(%rsp), %rsp\n"
" popq %r12 \n"
" popq %r13 \n"
" popq %r14 \n"
" popq %r15 \n"
" popq %rbx \n"
" popq %rbp \n"
" popq %r8\n"
" movq %rdx, %rax\n"
" movq %rdx, %rdi\n"
" jmp *%r8\n"
".size bthread_jump_fcontext,.-bthread_jump_fcontext\n"
".section .note.GNU-stack,\"\",%progbits\n"
);
#endif
#if defined(BTHREAD_CONTEXT_PLATFORM_linux_x86_64) && defined(BTHREAD_CONTEXT_COMPILER_gcc)
__asm (
".text\n"
".globl bthread_make_fcontext\n"
".type bthread_make_fcontext,@function\n"
".align 16\n"
"bthread_make_fcontext:\n"
" movq %rdi, %rax\n"
" andq $-16, %rax\n"
" leaq -0x48(%rax), %rax\n"
" movq %rdx, 0x38(%rax)\n"
" stmxcsr (%rax)\n"
" fnstcw 0x4(%rax)\n"
" leaq finish(%rip), %rcx\n"
" movq %rcx, 0x40(%rax)\n"
" ret \n"
"finish:\n"
" xorq %rdi, %rdi\n"
" call _exit@PLT\n"
" hlt\n"
".size bthread_make_fcontext,.-bthread_make_fcontext\n"
".section .note.GNU-stack,\"\",%progbits\n"
);
#endif
#if defined(BTHREAD_CONTEXT_PLATFORM_apple_x86_64) && defined(BTHREAD_CONTEXT_COMPILER_gcc)
__asm (
".text\n"
".globl _bthread_jump_fcontext\n"
".align 8\n"
"_bthread_jump_fcontext:\n"
" pushq %rbp \n"
" pushq %rbx \n"
" pushq %r15 \n"
" pushq %r14 \n"
" pushq %r13 \n"
" pushq %r12 \n"
" leaq -0x8(%rsp), %rsp\n"
" cmp $0, %rcx\n"
" je 1f\n"
" stmxcsr (%rsp)\n"
" fnstcw 0x4(%rsp)\n"
"1:\n"
" movq %rsp, (%rdi)\n"
" movq %rsi, %rsp\n"
" cmp $0, %rcx\n"
" je 2f\n"
" ldmxcsr (%rsp)\n"
" fldcw 0x4(%rsp)\n"
"2:\n"
" leaq 0x8(%rsp), %rsp\n"
" popq %r12 \n"
" popq %r13 \n"
" popq %r14 \n"
" popq %r15 \n"
" popq %rbx \n"
" popq %rbp \n"
" popq %r8\n"
" movq %rdx, %rax\n"
" movq %rdx, %rdi\n"
" jmp *%r8\n"
);
#endif
#if defined(BTHREAD_CONTEXT_PLATFORM_apple_x86_64) && defined(BTHREAD_CONTEXT_COMPILER_gcc)
__asm (
".text\n"
".globl _bthread_make_fcontext\n"
".align 8\n"
"_bthread_make_fcontext:\n"
" movq %rdi, %rax\n"
" movabs $-16, %r8\n"
" andq %r8, %rax\n"
" leaq -0x48(%rax), %rax\n"
" movq %rdx, 0x38(%rax)\n"
" stmxcsr (%rax)\n"
" fnstcw 0x4(%rax)\n"
" leaq finish(%rip), %rcx\n"
" movq %rcx, 0x40(%rax)\n"
" ret \n"
"finish:\n"
" xorq %rdi, %rdi\n"
" call __exit\n"
" hlt\n"
);
#endif
#if defined(BTHREAD_CONTEXT_PLATFORM_apple_i386) && defined(BTHREAD_CONTEXT_COMPILER_gcc)
__asm (
".text\n"
".globl _bthread_jump_fcontext\n"
".align 2\n"
"_bthread_jump_fcontext:\n"
" movl 0x10(%esp), %ecx\n"
" pushl %ebp \n"
" pushl %ebx \n"
" pushl %esi \n"
" pushl %edi \n"
" leal -0x8(%esp), %esp\n"
" test %ecx, %ecx\n"
" je 1f\n"
" stmxcsr (%esp)\n"
" fnstcw 0x4(%esp)\n"
"1:\n"
" movl 0x1c(%esp), %eax\n"
" movl %esp, (%eax)\n"
" movl 0x20(%esp), %edx\n"
" movl 0x24(%esp), %eax\n"
" movl %edx, %esp\n"
" test %ecx, %ecx\n"
" je 2f\n"
" ldmxcsr (%esp)\n"
" fldcw 0x4(%esp)\n"
"2:\n"
" leal 0x8(%esp), %esp\n"
" popl %edi \n"
" popl %esi \n"
" popl %ebx \n"
" popl %ebp \n"
" popl %edx\n"
" movl %eax, 0x4(%esp)\n"
" jmp *%edx\n"
);
#endif
#if defined(BTHREAD_CONTEXT_PLATFORM_apple_i386) && defined(BTHREAD_CONTEXT_COMPILER_gcc)
__asm (
".text\n"
".globl _bthread_make_fcontext\n"
".align 2\n"
"_bthread_make_fcontext:\n"
" movl 0x4(%esp), %eax\n"
" leal -0x8(%eax), %eax\n"
" andl $-16, %eax\n"
" leal -0x20(%eax), %eax\n"
" movl 0xc(%esp), %edx\n"
" movl %edx, 0x18(%eax)\n"
" stmxcsr (%eax)\n"
" fnstcw 0x4(%eax)\n"
" call 1f\n"
"1: popl %ecx\n"
" addl $finish-1b, %ecx\n"
" movl %ecx, 0x1c(%eax)\n"
" ret \n"
"finish:\n"
" xorl %eax, %eax\n"
" movl %eax, (%esp)\n"
" call __exit\n"
" hlt\n"
);
#endif
#if defined(BTHREAD_CONTEXT_PLATFORM_linux_arm32) && defined(BTHREAD_CONTEXT_COMPILER_gcc)
__asm (
".text\n"
".globl bthread_jump_fcontext\n"
".align 2\n"
".type bthread_jump_fcontext,%function\n"
"bthread_jump_fcontext:\n"
" @ save LR as PC\n"
" push {lr}\n"
" @ save V1-V8,LR\n"
" push {v1-v8,lr}\n"
" @ prepare stack for FPU\n"
" sub sp, sp, #64\n"
" @ test if fpu env should be preserved\n"
" cmp a4, #0\n"
" beq 1f\n"
" @ save S16-S31\n"
" vstmia sp, {d8-d15}\n"
"1:\n"
" @ store RSP (pointing to context-data) in A1\n"
" str sp, [a1]\n"
" @ restore RSP (pointing to context-data) from A2\n"
" mov sp, a2\n"
" @ test if fpu env should be preserved\n"
" cmp a4, #0\n"
" beq 2f\n"
" @ restore S16-S31\n"
" vldmia sp, {d8-d15}\n"
"2:\n"
" @ prepare stack for FPU\n"
" add sp, sp, #64\n"
" @ use third arg as return value after jump\n"
" @ and as first arg in context function\n"
" mov a1, a3\n"
" @ restore v1-V8,LR,PC\n"
" pop {v1-v8,lr,pc}\n"
".size bthread_jump_fcontext,.-bthread_jump_fcontext\n"
"@ Mark that we don't need executable stack.\n"
".section .note.GNU-stack,\"\",%progbits\n"
);
#endif
#if defined(BTHREAD_CONTEXT_PLATFORM_linux_arm32) && defined(BTHREAD_CONTEXT_COMPILER_gcc)
__asm (
".text\n"
".globl bthread_make_fcontext\n"
".align 2\n"
".type bthread_make_fcontext,%function\n"
"bthread_make_fcontext:\n"
" @ shift address in A1 to lower 16 byte boundary\n"
" bic a1, a1, #15\n"
" @ reserve space for context-data on context-stack\n"
" sub a1, a1, #104\n"
" @ third arg of bthread_make_fcontext() == address of context-function\n"
" str a3, [a1,#100]\n"
" @ compute abs address of label finish\n"
" adr a2, finish\n"
" @ save address of finish as return-address for context-function\n"
" @ will be entered after context-function returns\n"
" str a2, [a1,#96]\n"
" bx lr @ return pointer to context-data\n"
"finish:\n"
" @ exit code is zero\n"
" mov a1, #0\n"
" @ exit application\n"
" bl _exit@PLT\n"
".size bthread_make_fcontext,.-bthread_make_fcontext\n"
"@ Mark that we don't need executable stack.\n"
".section .note.GNU-stack,\"\",%progbits\n"
);
#endif