This is an archive of the discontinued LLVM Phabricator instance.

Show First 20 Lines • Show All 247 Lines • ▼ Show 20 Lines	static bool FunctionHasPadding(uptr address, uptr size) {
return false;		return false;
}		}

static void WritePadding(uptr from, uptr size) {		static void WritePadding(uptr from, uptr size) {
_memset((void*)from, 0xCC, (size_t)size);		_memset((void*)from, 0xCC, (size_t)size);
}		}

static void WriteJumpInstruction(uptr from, uptr target) {		static void WriteJumpInstruction(uptr from, uptr target) {
if (!DistanceIsWithin2Gig(from + kJumpInstructionLength, target))		if (!DistanceIsWithin2Gig(from + kJumpInstructionLength, target)) {
		Report("interception_win: cannot write jmp further than 2GB away, from %p "
		"to %p.\n", (void)from, (void)target);
InterceptionFailed();		InterceptionFailed();
		}
ptrdiff_t offset = target - from - kJumpInstructionLength;		ptrdiff_t offset = target - from - kJumpInstructionLength;
(u8)from = 0xE9;		(u8)from = 0xE9;
(u32)(from + 1) = offset;		(u32)(from + 1) = offset;
}		}

static void WriteShortJumpInstruction(uptr from, uptr target) {		static void WriteShortJumpInstruction(uptr from, uptr target) {
sptr offset = target - from - kShortJumpInstructionLength;		sptr offset = target - from - kShortJumpInstructionLength;
if (offset < -128 \|\| offset > 127)		if (offset < -128 \|\| offset > 127)
InterceptionFailed();		InterceptionFailed();
(u8)from = 0xEB;		(u8)from = 0xEB;
(u8)(from + 1) = (u8)offset;		(u8)(from + 1) = (u8)offset;
}		}

#if SANITIZER_WINDOWS64		#if SANITIZER_WINDOWS64
static void WriteIndirectJumpInstruction(uptr from, uptr indirect_target) {		static void WriteIndirectJumpInstruction(uptr from, uptr indirect_target) {
// jmp [rip + <offset>] = FF 25 <offset> where <offset> is a relative		// jmp [rip + <offset>] = FF 25 <offset> where <offset> is a relative
// offset.		// offset.
// The offset is the distance from then end of the jump instruction to the		// The offset is the distance from then end of the jump instruction to the
// memory location containing the targeted address. The displacement is still		// memory location containing the targeted address. The displacement is still
// 32-bit in x64, so indirect_target must be located within +/- 2GB range.		// 32-bit in x64, so indirect_target must be located within +/- 2GB range.
int offset = indirect_target - from - kIndirectJumpInstructionLength;		int offset = indirect_target - from - kIndirectJumpInstructionLength;
if (!DistanceIsWithin2Gig(from + kIndirectJumpInstructionLength,		if (!DistanceIsWithin2Gig(from + kIndirectJumpInstructionLength,
indirect_target)) {		indirect_target)) {
		Report("interception_win: cannot write indirect jmp with target further "
		"than 2GB away, from %p to %p.\n", (void*)from,
		(void*)indirect_target);
InterceptionFailed();		InterceptionFailed();
}		}
(u16)from = 0x25FF;		(u16)from = 0x25FF;
(u32)(from + 2) = offset;		(u32)(from + 2) = offset;
}		}
#endif		#endif

static void WriteBranch(		static void WriteBranch(
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This is an archive of the discontinued LLVM Phabricator instance.

[compiler-rt][interception][win] Add error messages for some errorsClosedPublic

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compiler-rt/lib/interception/interception_win.cpp

[compiler-rt][interception][win] Add error messages for some errors
ClosedPublic