Handle EXC_ARITHMETIC exception codes

[philipphofmann]

Description

mach/arm/exception.h defines codes for EXC_ARITHMETIC

#define EXC_ARM_FP_UNDEFINED    0       /* Undefined Floating Point Exception */
#define EXC_ARM_FP_IO           1       /* Invalid Floating Point Operation */
#define EXC_ARM_FP_DZ           2       /* Floating Point Divide by Zero */
#define EXC_ARM_FP_OF           3       /* Floating Point Overflow */
#define EXC_ARM_FP_UF           4       /* Floating Point Underflow */
#define EXC_ARM_FP_IX           5       /* Inexact Floating Point Result */
#define EXC_ARM_FP_ID           6       /* Floating Point Denormal Input */

We use these codes to improve the generic exception message

sentry-cocoa/Sources/SentryCrash/Recording/SentryCrashDoctor.m

Lines 445 to 447 in ecd9ecd

	if ([self isMathError:errorReport]) {
	return @"Math error (usually caused from division by 0).";
	}

We could achieve this by getting a better machCodeName here

sentry-cocoa/Sources/SentryCrash/Recording/SentryCrashReport.c

Lines 1278 to 1281 in ecd9ecd

	const char *machExceptionName = sentrycrashmach_exceptionName(crash->mach.type);
	const char *machCodeName = crash->mach.code == 0
	? NULL
	: sentrycrashmach_kernelReturnCodeName(crash->mach.code);

or here

sentry-cocoa/Sources/SentryCrash/Recording/SentryCrashDoctor.m

Lines 300 to 310 in ecd9ecd

	- (BOOL)isMathError:(NSDictionary *)errorReport
	{
	NSDictionary *machError = [errorReport objectForKey:@SentryCrashField_Mach];
	if (machError != nil) {
	NSString *exceptionName = [machError objectForKey:@SentryCrashField_ExceptionName];
	return [exceptionName isEqualToString:@"EXC_ARITHMETIC"];
	}
	NSDictionary *signal = [errorReport objectForKey:@SentryCrashField_Signal];
	NSString *sigName = [signal objectForKey:@SentryCrashField_Name];
	return [sigName isEqualToString:@"SIGFPE"];
	}

Came up in #2662.