musl/arch/mips/ksigaction.h

#include <features.h>

struct k_sigaction {
	unsigned flags;
	void (*handler)(int);
	unsigned long mask[4];
	/* The following field is past the end of the structure the
	 * kernel will read or write, and exists only to avoid having
	 * mips-specific preprocessor conditionals in sigaction.c. */
	void (*restorer)();
};

hidden void __restore(), __restore_rt();
apply hidden visibility to sigreturn code fragments these were overlooked in the declarations overhaul work because they are not properly declared, and the current framework even allows their declared types to vary by arch. at some point this should be cleaned up, but I'm not sure what the right way would be. 2018-09-11 15:57:31 +00:00			`#include <features.h>`

initial version of mips (o32) port, based on work by Richard Pennington (rdp) basically, this version of the code was obtained by starting with rdp's work from his ellcc source tree, adapting it to musl's build system and coding style, auditing the bits headers for discrepencies with kernel definitions or glibc/LSB ABI or large file issues, fixing up incompatibility with the old binutils from aboriginal linux, and adding some new special cases to deal with the oddities of sigaction and pipe syscall interfaces on mips. at present, minimal test programs work, but some interfaces are broken or missing. threaded programs probably will not link. 2012-07-11 08:22:13 +00:00			`struct k_sigaction {`
			`unsigned flags;`
			`void (*handler)(int);`
			`unsigned long mask[4];`
add some comments about the mips ksigaction structure weirdness 2013-06-29 16:24:06 +00:00			`/* The following field is past the end of the structure the`
			`* kernel will read or write, and exists only to avoid having`
			`* mips-specific preprocessor conditionals in sigaction.c. */`
initial version of mips (o32) port, based on work by Richard Pennington (rdp) basically, this version of the code was obtained by starting with rdp's work from his ellcc source tree, adapting it to musl's build system and coding style, auditing the bits headers for discrepencies with kernel definitions or glibc/LSB ABI or large file issues, fixing up incompatibility with the old binutils from aboriginal linux, and adding some new special cases to deal with the oddities of sigaction and pipe syscall interfaces on mips. at present, minimal test programs work, but some interfaces are broken or missing. threaded programs probably will not link. 2012-07-11 08:22:13 +00:00			`void (*restorer)();`
			`};`
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
apply hidden visibility to sigreturn code fragments these were overlooked in the declarations overhaul work because they are not properly declared, and the current framework even allows their declared types to vary by arch. at some point this should be cleaned up, but I'm not sure what the right way would be. 2018-09-11 15:57:31 +00:00			`hidden void __restore(), __restore_rt();`