POSIX signal 小整理

做 SOC 軟體的人常常會收到 bug 的 log, 其中一個常見的類型就是 signal XXX, code YYY, fault address ZZZ. 例如:

Fatal signal 11 (SIGSEGV), code 2, fault addr 0x12345678 in tid 12345 (MyTask)

這個 log 是標準 C library 裡面的 signal.h 所定義的 [1]. 參考 ref [2], 裡面有較完整的 code No. 說明, 而 ref [3] 有完整的 POSIX signal 定義和歷史沿革; Ref [4] 是把 Unix signal 做成一張表.

取常用的部分, 重新整理如下. 這些都是 core error, 所以會終止程序, 並且產生 core dump.

Signal	No.	Code	No.	Reason
SIGILL	4	ILL_ILLOPC	1	Illegal opcode.
		ILL_ILLOPN	2	Illegal operand.
		ILL_ILLADR	3	Illegal addressing mode.
		ILL_ILLTRP	4	Illegal trap.
		ILL_PRVOPC	5	Privileged opcode.
		ILL_PRVREG	6	Privileged register.
		ILL_COPROC	7	Coprocessor error.
		ILL_BADSTK	8	Internal stack error.
SIGFPE	8	FPE_INTDIV	1	Integer divide by zero.
		FPE_INTOVF	2	Integer overflow.
		FPE_FLTDIV	3	Floating-point divide by zero.
		FPE_FLTOVF	4	Floating-point overflow.
		FPE_FLTUND	5	Floating-point underflow.
		FPE_FLTRES	6	Floating-point inexact result.
		FPE_FLTINV	7	Invalid floating-point operation.
		FPE_FLTSUB	8	Subscript out of range.
SIGSEGV	11	SEGV_MAPERR	1	Address not mapped to object.
		SEGV_ACCERR	2	Invalid permissions for mapped object.
SIGBUS	10	BUS_ADRALN	1	Invalid address alignment.
		BUS_ADRERR	2	Nonexistent physical address.
		BUS_OBJERR	3	Object-specific hardware error.
SIGTRAP	5	TRAP_BRKPT	1	Process breakpoint.
		TRAP_TRACE	2	Process trace trap.

[REF]

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