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[Release/8.0] Fix FP state restore on macOS exception forwarding #109579

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[Release/8.0] Fix FP state restore on macOS exception forwarding #109579

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4 changes: 2 additions & 2 deletions src/coreclr/pal/src/exception/machexception.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -849,7 +849,7 @@ HijackFaultingThread(
if (fIsStackOverflow)
{
// Allocate the minimal stack necessary for handling stack overflow
int stackOverflowStackSize = 7 * 4096;
int stackOverflowStackSize = 15 * 4096;
// Align the size to virtual page size and add one virtual page as a stack guard
stackOverflowStackSize = ALIGN_UP(stackOverflowStackSize, GetVirtualPageSize()) + GetVirtualPageSize();
void* stackOverflowHandlerStack = mmap(NULL, stackOverflowStackSize, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
Expand Down Expand Up @@ -1325,7 +1325,7 @@ void MachExceptionInfo::RestoreState(mach_port_t thread)
kern_return_t machret = thread_set_state(thread, x86_THREAD_STATE, (thread_state_t)&ThreadState, x86_THREAD_STATE_COUNT);
CHECK_MACH("thread_set_state(thread)", machret);

machret = thread_set_state(thread, x86_FLOAT_STATE, (thread_state_t)&FloatState, x86_FLOAT_STATE_COUNT);
machret = thread_set_state(thread, FloatState.ash.flavor, (thread_state_t)&FloatState.ufs, FloatState.ash.count);
CHECK_MACH("thread_set_state(float)", machret);

machret = thread_set_state(thread, x86_DEBUG_STATE, (thread_state_t)&DebugState, x86_DEBUG_STATE_COUNT);
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8 changes: 3 additions & 5 deletions src/coreclr/pal/src/exception/machmessage.h
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Expand Up @@ -186,11 +186,6 @@ class MachMessage
void ReplyToNotification(MachMessage& message, kern_return_t eResult);

private:
// The maximum size in bytes of any Mach message we can send or receive. Calculating an exact size for
// this is non trivial (basically because of the security trailers that Mach appends) but the current
// value has proven to be more than enough so far.
static const size_t kcbMaxMessageSize = 1500;

// The following are structures describing the formats of the Mach messages we understand.

// Request to set the register context on a particular thread.
Expand Down Expand Up @@ -298,6 +293,9 @@ class MachMessage
} data;
} __attribute__((packed));;

// The maximum size in bytes of any Mach message we can send or receive including possible trailers
static const size_t kcbMaxMessageSize = sizeof(mach_message_t) + MAX_TRAILER_SIZE;

// Re-initializes this data structure (to the same state as default construction, containing no message).
void ResetMessage();

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