musl/arch/sh/ksigaction.h

struct k_sigaction {
	void (*handler)(int);
	unsigned long flags;
	void *restorer;
	unsigned mask[2];
};

extern unsigned char __restore[], __restore_rt[];
fix signal return for sh/fdpic the restorer function pointer provided in the kernel sigaction structure is interpreted by the kernel as a raw code address, not a function descriptor. this commit moves the declarations of the __restore and __restore_rt symbols to ksigaction.h so that arch versions of the file can override them, and introduces a version for sh which declares them as objects rather than functions. an alternate solution would have been defining SA_RESTORER to 0 so that the functions are not used, but this both requires executable stack (since the sh kernel does not have a vdso page with permanent restorer functions) and crashes on qemu user-level emulation. 2015-09-23 18:33:49 +00:00			`struct k_sigaction {`
			`void (*handler)(int);`
			`unsigned long flags;`
			`void *restorer;`
			`unsigned mask[2];`
			`};`

			`extern unsigned char __restore[], __restore_rt[];`