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musl/arch/sh/ksigaction.h

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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.
11 years ago
struct k_sigaction {
void (*handler)(int);
unsigned long flags;
void *restorer;
unsigned mask[2];
};
extern unsigned char __restore[], __restore_rt[];