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Refactor KE::KernelInit::SwitchBootStack() inline assembly
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This commit is contained in:
Rafal Kupiec
2026-04-29 20:23:01 +02:00
parent 03a9907bee
commit f03515b0eb
2 changed files with 19 additions and 20 deletions
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18
xtoskrnl/ke/amd64/krnlinit.cc
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@@ -144,14 +144,14 @@ KE::KernelInit::SwitchBootStack(VOID)
StartKernel = (PVOID)KE::KernelInit::StartKernel;
/* Discard old stack frame, switch stack and jump to KernelInit::StartKernel() */
__asm__ volatile("mov %0, %%rdx\n"
"xor %%rbp, %%rbp\n"
"mov %%rdx, %%rsp\n"
"sub %1, %%rsp\n"
"jmp *%2\n"
__asm__ volatile("movq %[Stack], %%rsp\n"
"subq %[TotalSize], %%rsp\n"
"xorq %%rbp, %%rbp\n"
"jmp *%[TargetRoutine]\n"
:
: "m" (Stack),
"i" (FLOATING_SAVE_AREA_SIZE | KEXCEPTION_FRAME_SIZE | KSWITCH_FRAME_SIZE | KRETURN_ADDRESS_SIZE),
"r" (StartKernel)
: "rdx", "rbp", "rsp", "memory");
: [Stack] "r" (Stack),
[TargetRoutine] "r" (StartKernel),
[TotalSize] "i" (FLOATING_SAVE_AREA_SIZE + KEXCEPTION_FRAME_SIZE +
KSWITCH_FRAME_SIZE + KRETURN_ADDRESS_SIZE)
: "memory", "rbp", "rsp");
}

21
xtoskrnl/ke/i686/krnlinit.cc
View File

@@ -144,16 +144,15 @@ KE::KernelInit::SwitchBootStack(VOID)
StartKernel = (PVOID)KE::KernelInit::StartKernel;
/* Discard old stack frame, switch stack, make space for NPX and jump to KernelInit::StartKernel() */
__asm__ volatile("mov %0, %%edx\n"
"xor %%ebp, %%ebp\n"
"mov %%edx, %%esp\n"
"sub %1, %%esp\n"
"push %2\n"
"jmp *%3\n"
__asm__ volatile("movl %[Stack], %%esp\n"
"subl %[TotalSize], %%esp\n"
"xorl %%ebp, %%ebp\n"
"pushl %[Cr0Value]\n"
"jmp *%[TargetRoutine]\n"
:
: "m" (Stack),
"i" (KTRAP_FRAME_ALIGN | KTRAP_FRAME_SIZE | NPX_FRAME_SIZE | KRETURN_ADDRESS_SIZE),
"i" (CR0_EM | CR0_MP | CR0_TS),
"r" (StartKernel)
: "edx", "ebp", "esp", "memory");
: [Cr0Value] "i" (CR0_EM | CR0_MP | CR0_TS),
[Stack] "r" (Stack),
[TargetRoutine] "r" (StartKernel),
[TotalSize] "i" (KTRAP_FRAME_ALIGN + KTRAP_FRAME_SIZE + NPX_FRAME_SIZE + KRETURN_ADDRESS_SIZE)
: "ebp", "esp", "memory");
}