[PATCH v2 0/1] MR282: ntdll: Set r11 on exit from syscall dispatcher on x64.
-- v2: ntdll: Set r11 on exit from syscall dispatcher on x64. https://gitlab.winehq.org/wine/wine/-/merge_requests/282
From: Jinoh Kang <jinoh.kang.kr(a)gmail.com> Signed-off-by: Jinoh Kang <jinoh.kang.kr(a)gmail.com> --- dlls/ntdll/tests/exception.c | 15 +++++++++++++++ dlls/ntdll/unix/signal_x86_64.c | 4 ++++ 2 files changed, 19 insertions(+) diff --git a/dlls/ntdll/tests/exception.c b/dlls/ntdll/tests/exception.c index 820e435bc1b..d7a1b701b0a 100644 --- a/dlls/ntdll/tests/exception.c +++ b/dlls/ntdll/tests/exception.c @@ -4949,6 +4949,8 @@ static void test_syscall_clobbered_regs(void) struct regs { UINT64 rcx; + UINT64 r11; + UINT32 eflags; }; static const BYTE code[] = { @@ -4959,6 +4961,8 @@ static void test_syscall_clobbered_regs(void) 0x48, 0x83, 0xe8, 0x08, /* subq $8,%rax */ 0x48, 0x89, 0x20, /* movq %rsp,0(%rax) */ 0x48, 0x89, 0xc4, /* movq %rax,%rsp */ + 0xfd, /* std */ + 0x45, 0x31, 0xdb, /* xorl %r11d,%r11d */ 0x41, 0x50, /* push %r8 */ 0x53, 0x55, 0x57, 0x56, 0x41, 0x54, 0x41, 0x55, 0x41, 0x56, 0x41, 0x57, /* push %rbx, %rbp, %rdi, %rsi, %r12, %r13, %r14, %r15 */ @@ -4967,6 +4971,11 @@ static void test_syscall_clobbered_regs(void) /* pop %r15, %r14, %r13, %r12, %rsi, %rdi, %rbp, %rbx */ 0x41, 0x58, /* pop %r8 */ 0x49, 0x89, 0x48, 0x00, /* mov %rcx,(%r8) */ + 0x4d, 0x89, 0x58, 0x08, /* mov %r11,0x8(%r8) */ + 0x9c, /* pushfq */ + 0x59, /* pop %rcx */ + 0xfc, /* cld */ + 0x41, 0x89, 0x48, 0x10, /* mov %ecx,0x10(%r8) */ 0x5c, /* pop %rsp */ 0xc3, /* ret */ }; @@ -4985,6 +4994,7 @@ static void test_syscall_clobbered_regs(void) memset(®s, 0, sizeof(regs)); status = func((HANDLE)0xdeadbeef, NULL, ®s, pNtCancelTimer); ok(status == STATUS_INVALID_HANDLE, "Got unexpected status %#lx.\n", status); + ok(regs.r11 == regs.eflags, "Expected r11 (%#I64x) to equal EFLAGS (%#x).\n", regs.r11, regs.eflags); /* After the syscall instruction rcx contains the address of the instruction next after syscall. */ ok((BYTE *)regs.rcx > (BYTE *)pNtCancelTimer && (BYTE *)regs.rcx < (BYTE *)pNtCancelTimer + 0x20, @@ -4994,28 +5004,33 @@ static void test_syscall_clobbered_regs(void) ok(status == STATUS_ACCESS_VIOLATION, "Got unexpected status %#lx.\n", status); ok((BYTE *)regs.rcx > (BYTE *)pNtCancelTimer && (BYTE *)regs.rcx < (BYTE *)pNtCancelTimer + 0x20, "Got unexpected rcx %s, pNtCancelTimer %p.\n", wine_dbgstr_longlong(regs.rcx), pNtCancelTimer); + ok(regs.r11 == regs.eflags, "Expected r11 (%#I64x) to equal EFLAGS (%#x).\n", regs.r11, regs.eflags); context.ContextFlags = CONTEXT_CONTROL; status = func(GetCurrentThread(), &context, ®s, pNtGetContextThread); ok(status == STATUS_SUCCESS, "Got unexpected status %#lx.\n", status); ok((BYTE *)regs.rcx > (BYTE *)pNtGetContextThread && (BYTE *)regs.rcx < (BYTE *)pNtGetContextThread + 0x20, "Got unexpected rcx %s, pNtGetContextThread %p.\n", wine_dbgstr_longlong(regs.rcx), pNtGetContextThread); + ok(regs.r11 == regs.eflags, "Expected r11 (%#I64x) to equal EFLAGS (%#x).\n", regs.r11, regs.eflags); status = func(GetCurrentThread(), &context, ®s, pNtSetContextThread); ok(status == STATUS_SUCCESS, "Got unexpected status %#lx.\n", status); ok((BYTE *)regs.rcx > (BYTE *)pNtGetContextThread && (BYTE *)regs.rcx < (BYTE *)pNtGetContextThread + 0x20, "Got unexpected rcx %s, pNtGetContextThread %p.\n", wine_dbgstr_longlong(regs.rcx), pNtGetContextThread); + ok((regs.r11 | 0x2) == regs.eflags, "Expected r11 (%#I64x) | 0x2 to equal EFLAGS (%#x).\n", regs.r11, regs.eflags); context.ContextFlags = CONTEXT_INTEGER; status = func(GetCurrentThread(), &context, ®s, pNtGetContextThread); ok(status == STATUS_SUCCESS, "Got unexpected status %#lx.\n", status); ok((BYTE *)regs.rcx > (BYTE *)pNtGetContextThread && (BYTE *)regs.rcx < (BYTE *)pNtGetContextThread + 0x20, "Got unexpected rcx %s, pNtGetContextThread %p.\n", wine_dbgstr_longlong(regs.rcx), pNtGetContextThread); + ok(regs.r11 == regs.eflags, "Expected r11 (%#I64x) to equal EFLAGS (%#x).\n", regs.r11, regs.eflags); status = func(GetCurrentThread(), &context, ®s, pNtSetContextThread); ok(status == STATUS_SUCCESS, "Got unexpected status %#lx.\n", status); ok((BYTE *)regs.rcx > (BYTE *)pNtSetContextThread && (BYTE *)regs.rcx < (BYTE *)pNtSetContextThread + 0x20, "Got unexpected rcx %s, pNtSetContextThread %p.\n", wine_dbgstr_longlong(regs.rcx), pNtSetContextThread); + ok(regs.r11 == regs.eflags, "Expected r11 (%#I64x) to equal EFLAGS (%#x).\n", regs.r11, regs.eflags); } #elif defined(__arm__) diff --git a/dlls/ntdll/unix/signal_x86_64.c b/dlls/ntdll/unix/signal_x86_64.c index 6c87e347eac..42ce376f674 100644 --- a/dlls/ntdll/unix/signal_x86_64.c +++ b/dlls/ntdll/unix/signal_x86_64.c @@ -3417,12 +3417,16 @@ __ASM_GLOBAL_FUNC( __wine_syscall_dispatcher, "movq 0x08(%rcx),%rbx\n\t" "testl $0x3,%edx\n\t" /* CONTEXT_CONTROL | CONTEXT_INTEGER */ "jnz 1f\n\t" + "leaq 0x80(%rcx),%rsp\n\t" + "mov (%rsp),%r11\n\t" /* frame->eflags */ + "popfq\n\t" "movq 0x88(%rcx),%rsp\n\t" "movq 0x70(%rcx),%rcx\n\t" /* frame->rip */ "jmpq *%rcx\n\t" "1:\tleaq 0x70(%rcx),%rsp\n\t" "testl $0x2,%edx\n\t" /* CONTEXT_INTEGER */ "jnz 1f\n\t" + "movq 0x10(%rsp),%r11\n\t" /* frame->eflags */ "movq (%rsp),%rcx\n\t" /* frame->rip */ "iretq\n" "1:\tmovq 0x00(%rcx),%rax\n\t" -- GitLab https://gitlab.winehq.org/wine/wine/-/merge_requests/282
1. Squashed into one commit. 2. Restore EFLAGS from syscall entry. -- https://gitlab.winehq.org/wine/wine/-/merge_requests/282#note_2714
participants (2)
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Jinoh Kang -
Jinoh Kang (＠iamahuman)