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Make syscall handler stub easier to debug

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Alex 2023-05-04 22:40:18 +03:00
parent 533b945e84
commit 71c9306828
Signed by untrusted user who does not match committer: enderice2
GPG Key ID: EACC3AD603BAB4DD
1 changed files with 22 additions and 19 deletions
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41
Architecture/amd64/SystemCalls.cpp
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@ -31,17 +31,17 @@ extern "C" void SystemCallHandlerStub();
extern "C" __naked __used __no_stack_protector __aligned(16) void SystemCallHandlerStub() extern "C" __naked __used __no_stack_protector __aligned(16) void SystemCallHandlerStub()
{ {
asmv("swapgs\n" asmv("swapgs\n");
"mov %rsp, %gs:0x8\n" // CPUData->TempStack asmv("mov %rsp, %gs:0x8\n"); // CPUData->TempStack
"mov %gs:0x0, %rsp\n" // CPUData->SystemCallStack asmv("mov %gs:0x0, %rsp\n"); // CPUData->SystemCallStack
"push $0x1b\n" // user data segment asmv("push $0x1b\n"); // user data segment
"push %gs:0x8\n" // saved stack asmv("push %gs:0x8\n"); // saved stack
"push %r11\n" // saved rflags asmv("push %r11\n"); // saved rflags
"push $0x23\n" // user code segment asmv("push $0x23\n"); // user code segment
"push %rcx\n" // Current RIP asmv("push %rcx\n"); // Current RIP
"push %rax\n" asmv("push %rax\n"
"push %rbx\n" "push %rbx\n"
"push %rcx\n" "push %rcx\n"
"push %rdx\n" "push %rdx\n"
@ -55,13 +55,13 @@ extern "C" __naked __used __no_stack_protector __aligned(16) void SystemCallHand
"push %r12\n" "push %r12\n"
"push %r13\n" "push %r13\n"
"push %r14\n" "push %r14\n"
"push %r15\n" "push %r15\n");
"mov %rsp, %rdi\n" asmv("mov %rsp, %rdi\n");
"mov $0, %rbp\n" asmv("mov $0, %rbp\n");
"call SystemCallsHandler\n" asmv("call SystemCallsHandler\n");
"pop %r15\n" asmv("pop %r15\n"
"pop %r14\n" "pop %r14\n"
"pop %r13\n" "pop %r13\n"
"pop %r12\n" "pop %r12\n"
@ -74,13 +74,16 @@ extern "C" __naked __used __no_stack_protector __aligned(16) void SystemCallHand
"pop %rsi\n" "pop %rsi\n"
"pop %rdx\n" "pop %rdx\n"
"pop %rcx\n" "pop %rcx\n"
"pop %rbx\n" "pop %rbx\n");
"mov %gs:0x8, %rsp\n" // CPUData->TempStack asmv("mov %gs:0x8, %rsp\n"); // CPUData->TempStack
#ifdef DEBUG
asmv("movq $0, %gs:0x8\n"); // Easier to debug stacks // FIXME: Can't use xor
#endif
"swapgs\n" asmv("swapgs\n");
"sti\n" asmv("sti\n");
"sysretq\n"); asmv("sysretq\n");
} }
void InitializeSystemCalls() void InitializeSystemCalls()