Commit 6bf9adfc authored by Al Viro's avatar Al Viro
Browse files

introduce generic sys_sigaltstack(), switch x86 and um to it 



Conditional on CONFIG_GENERIC_SIGALTSTACK; architectures that do not
select it are completely unaffected

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 9b064fc3

arch/Kconfig

+3 −0
Original line number Diff line number Diff line
@@ -335,6 +335,9 @@ config MODULES_USE_ELF_REL 
	  Modules only use ELF REL relocations.  Modules with ELF RELA

	  relocations will give an error.



config GENERIC_SIGALTSTACK

	bool



#

# ABI hall of shame

#

arch/um/kernel/signal.c

+0 −5
Original line number Diff line number Diff line
@@ -132,8 +132,3 @@ long sys_sigsuspend(int history0, int history1, old_sigset_t mask) 
	siginitset(&blocked, mask);

	return sigsuspend(&blocked);

}
 


long sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss)

{

	return do_sigaltstack(uss, uoss, PT_REGS_SP(&current->thread.regs));

}

arch/x86/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -111,6 +111,7 @@ config X86 
	select MODULES_USE_ELF_REL if X86_32

	select MODULES_USE_ELF_RELA if X86_64

	select CLONE_BACKWARDS if X86_32

	select GENERIC_SIGALTSTACK



config INSTRUCTION_DECODER

	def_bool y

arch/x86/include/asm/syscalls.h

+0 −3
Original line number Diff line number Diff line
@@ -25,9 +25,6 @@ asmlinkage int sys_modify_ldt(int, void __user *, unsigned long); 


/* kernel/signal.c */

long sys_rt_sigreturn(struct pt_regs *);

long sys_sigaltstack(const stack_t __user *, stack_t __user *,

		     struct pt_regs *);





/* kernel/tls.c */

asmlinkage int sys_set_thread_area(struct user_desc __user *);

arch/x86/kernel/entry_32.S

+0 −1
Original line number Diff line number Diff line
@@ -739,7 +739,6 @@ ENTRY(ptregs_##name) ; \ 
ENDPROC(ptregs_##name)



PTREGSCALL1(iopl)

PTREGSCALL2(sigaltstack)

PTREGSCALL0(sigreturn)

PTREGSCALL0(rt_sigreturn)

PTREGSCALL2(vm86)