https://git.reactos.org/?p=reactos.git;a=commitdiff;h=0c3812eb7e58b1a7ced66a68999794c9a34eb564
commit 0c3812eb7e58b1a7ced66a68999794c9a34eb564 Author: Timo Kreuzer <[email protected]> AuthorDate: Sat Mar 3 00:13:37 2018 +0100 Commit: Timo Kreuzer <[email protected]> CommitDate: Sat May 29 21:20:48 2021 +0200 [RTL/x64] Implement RtlRestoreContext --- sdk/include/asm/asm.inc | 4 ++ sdk/lib/rtl/amd64/except_asm.S | 130 +++++++++++++++++++++++++++++++++++++++++ sdk/lib/rtl/amd64/stubs.c | 9 --- 3 files changed, 134 insertions(+), 9 deletions(-) diff --git a/sdk/include/asm/asm.inc b/sdk/include/asm/asm.inc index d879b44ca7f..de46fb5c963 100644 --- a/sdk/include/asm/asm.inc +++ b/sdk/include/asm/asm.inc @@ -313,6 +313,10 @@ ENDM jmp far ptr \segment:\offset .endm +.macro retf + lret +.endm + /* MASM compatible EXTERN */ .macro EXTERN name .endm diff --git a/sdk/lib/rtl/amd64/except_asm.S b/sdk/lib/rtl/amd64/except_asm.S index ea2eb7f88c8..e3fd67b852f 100644 --- a/sdk/lib/rtl/amd64/except_asm.S +++ b/sdk/lib/rtl/amd64/except_asm.S @@ -106,6 +106,136 @@ PUBLIC RtlCaptureContext ret .ENDP +/* + * VOID NTAPI + * RtlRestoreContext( + * _In_ PCONTEXT ContextRecord@<rcx>, + * PEXCEPTION_RECORD *ExceptionRecord@<rdx>); + */ +PUBLIC RtlRestoreContext +.PROC RtlRestoreContext + + /* Allocate space */ + sub rsp, HEX(8) + .ALLOCSTACK 8 + .ENDPROLOG + + // TODO: Handle ExceptionRecord + + /* Restore legacy floating point registers (It's slow, so do it first) */ + ldmxcsr [rcx + CxMxCsr] + fxrstor [rcx + CxFltSave] + + /* Load the target stack pointer into rdx */ + mov rdx, [rcx + CxRsp] + + /* Load EFlags into rax (zero extended) */ + mov eax, [rcx + CxEFlags] + + /* Load the return address into r8 */ + mov r8, [rcx + CxRip] + + /* Load rdx restore value into r9 */ + mov r9, [rcx + CxRdx] + + /* Restore xmm registers */ + movaps xmm0, [rcx + CxXmm0] + movaps xmm1, [rcx + CxXmm1] + movaps xmm2, [rcx + CxXmm2] + movaps xmm3, [rcx + CxXmm3] + movaps xmm4, [rcx + CxXmm4] + movaps xmm5, [rcx + CxXmm5] + movaps xmm6, [rcx + CxXmm6] + movaps xmm7, [rcx + CxXmm7] + movaps xmm8, [rcx + CxXmm8] + movaps xmm9, [rcx + CxXmm9] + movaps xmm10, [rcx + CxXmm10] + movaps xmm11, [rcx + CxXmm11] + movaps xmm12, [rcx + CxXmm12] + movaps xmm13, [rcx + CxXmm13] + movaps xmm14, [rcx + CxXmm14] + movaps xmm15, [rcx + CxXmm15] + + /* Copy Return address (now in r8) to the target stack */ + mov [rdx - 2 * 8], r8 + + /* Copy Eflags (now in rax) to the target stack */ + mov [rdx - 3 * 8], rax + + /* Copy the value for rdx (now in r9) to the target stack */ + mov [rdx - 4 * 8], r9 + + /* Restore the integer registers */ + mov rbx, [rcx + CxRbx] + mov rsi, [rcx + CxRsi] + mov rdi, [rcx + CxRdi] + mov rbp, [rcx + CxRbp] + mov r10, [rcx + CxR10] + mov r11, [rcx + CxR11] + mov r12, [rcx + CxR12] + mov r13, [rcx + CxR13] + mov r14, [rcx + CxR14] + mov r15, [rcx + CxR15] + + /* Restore segment selectors */ + mov ds, [rcx + CxSegDs] // FIXME: WOW64 context? + mov es, [rcx + CxSegEs] + mov fs, [rcx + CxSegFs] + //mov gs, [rcx + CxSegGs] + //mov ss, [rcx + CxSegSs] + + /* Restore the registers we used */ + mov r8, [rcx + CxR8] + mov r9, [rcx + CxR9] + + /* Check if we go to a different cs */ + mov ax, cs + cmp [rcx + CxSegCs], ax + jne ReturnFar + + /* Restore rax and rcx */ + mov rax, [rcx + CxRax] + mov rcx, [rcx + CxRcx] + + /* Switch to the target stack */ + lea rsp, [rdx - 4 * 8] + + /* Pop rdx from the stack */ + pop rdx + + /* Pop Eflags from the stack */ + popfq + + /* Return and fix up the stack */ + ret 8 + +ReturnFar: + + /* Put cs on the stack for the far return */ + mov ax, [rcx + CxSegCs] + mov [rdx - 1 * 8], ax + + /* Load ss */ + mov ss, [rcx + CxSegSs] + + /* Restore rax and rcx */ + mov rax, [rcx + CxRax] + mov rcx, [rcx + CxRcx] + + /* Switch to the target stack */ + lea rsp, [rdx - 4 * 8] + + /* Pop rdx from the stack */ + pop rdx + + /* Pop Eflags from the stack */ + popfq + + /* Return far */ + retf + +.ENDP + END diff --git a/sdk/lib/rtl/amd64/stubs.c b/sdk/lib/rtl/amd64/stubs.c index 52288c44f84..7eb61416c36 100644 --- a/sdk/lib/rtl/amd64/stubs.c +++ b/sdk/lib/rtl/amd64/stubs.c @@ -97,15 +97,6 @@ RtlDispatchException(IN PEXCEPTION_RECORD ExceptionRecord, return FALSE; } -NTSYSAPI -VOID -RtlRestoreContext( - PCONTEXT ContextRecord, - PEXCEPTION_RECORD ExceptionRecord) -{ - UNIMPLEMENTED; -} - NTSTATUS NTAPI RtlQueueApcWow64Thread(
