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Kernel: Implement do_assume_context for execve() on x86_64

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Gunnar Beutner 2021-06-28 17:08:41 +02:00 committed by Andreas Kling
parent 247af7aa6a
commit e979a88af4
Notes: sideshowbarker 2024-07-18 11:22:46 +09:00 
Author: https://github.com/gunnarbeutner
Commit: https://github.com/SerenityOS/serenity/commit/e979a88af4d
Pull-request: https://github.com/SerenityOS/serenity/pull/8301
1 changed files with 8 additions and 12 deletions
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20
Kernel/Arch/x86/x86_64/Processor.cpp
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@ -36,29 +36,25 @@ asm(
);
// clang-format on
#if ARCH(I386)
// clang-format off
asm(
".global do_assume_context \n"
"do_assume_context: \n"
" movl 4(%esp), %ebx \n"
" movl 8(%esp), %esi \n"
" movq %rdi, %r12 \n" // save thread ptr
" movq %rsi, %r13 \n" // save flags
// We're going to call Processor::init_context, so just make sure
// we have enough stack space so we don't stomp over it
" subl $(" __STRINGIFY(4 + REGISTER_STATE_SIZE + TRAP_FRAME_SIZE + 4) "), %esp \n"
" pushl %esi \n"
" pushl %ebx \n"
" subq $(" __STRINGIFY(16 + REGISTER_STATE_SIZE + TRAP_FRAME_SIZE + 8) "), %rsp \n"
" cld \n"
" call do_init_context \n"
" addl $8, %esp \n"
" movl %eax, %esp \n" // move stack pointer to what Processor::init_context set up for us
" pushl %ebx \n" // push to_thread
" pushl %ebx \n" // push from_thread
" pushl $thread_context_first_enter \n" // should be same as tss.eip
" movq %rax, %rsp \n" // move stack pointer to what Processor::init_context set up for us
" movq %r12, %rdi \n" // to_thread
" movq %r12, %rsi \n" // from_thread
" movabs $thread_context_first_enter, %r12 \n" // should be same as regs.rip
" pushq %r12 \n"
" jmp enter_thread_context \n"
);
// clang-format on
#endif
String Processor::platform_string() const
{