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Fix mach hardware exception forwarding #105003

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merged 3 commits into from
Jul 17, 2024
Merged

Fix mach hardware exception forwarding #105003

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568b3b2
Fix mach hardware exception forwarding
janvorli Jul 17, 2024
fee489b
Simplify the RestoreState
janvorli Jul 17, 2024
9f38c18
Set the message buffer to the size of the mach_msg_t plus trailer size
janvorli Jul 17, 2024
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2 changes: 1 addition & 1 deletion src/coreclr/pal/src/exception/machexception.cpp
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Original file line number Diff line number Diff line change
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, 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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