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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: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
parent
9b064fc3f9
commit
6bf9adfc90
@ -335,6 +335,9 @@ config MODULES_USE_ELF_REL
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Modules only use ELF REL relocations. Modules with ELF RELA
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relocations will give an error.
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config GENERIC_SIGALTSTACK
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bool
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#
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# ABI hall of shame
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#
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@ -132,8 +132,3 @@ long sys_sigsuspend(int history0, int history1, old_sigset_t mask)
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siginitset(&blocked, mask);
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return sigsuspend(&blocked);
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}
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long sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss)
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{
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return do_sigaltstack(uss, uoss, PT_REGS_SP(¤t->thread.regs));
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}
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@ -111,6 +111,7 @@ config X86
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select MODULES_USE_ELF_REL if X86_32
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select MODULES_USE_ELF_RELA if X86_64
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select CLONE_BACKWARDS if X86_32
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select GENERIC_SIGALTSTACK
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config INSTRUCTION_DECODER
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def_bool y
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@ -25,9 +25,6 @@ asmlinkage int sys_modify_ldt(int, void __user *, unsigned long);
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/* kernel/signal.c */
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long sys_rt_sigreturn(struct pt_regs *);
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long sys_sigaltstack(const stack_t __user *, stack_t __user *,
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struct pt_regs *);
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/* kernel/tls.c */
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asmlinkage int sys_set_thread_area(struct user_desc __user *);
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@ -739,7 +739,6 @@ ENTRY(ptregs_##name) ; \
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ENDPROC(ptregs_##name)
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PTREGSCALL1(iopl)
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PTREGSCALL2(sigaltstack)
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PTREGSCALL0(sigreturn)
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PTREGSCALL0(rt_sigreturn)
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PTREGSCALL2(vm86)
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@ -864,7 +864,6 @@ END(stub_\func)
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FORK_LIKE clone
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FORK_LIKE fork
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FORK_LIKE vfork
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PTREGSCALL stub_sigaltstack, sys_sigaltstack, %rdx
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PTREGSCALL stub_iopl, sys_iopl, %rsi
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ENTRY(ptregscall_common)
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@ -602,13 +602,6 @@ sys_sigaction(int sig, const struct old_sigaction __user *act,
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}
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#endif /* CONFIG_X86_32 */
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long
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sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
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struct pt_regs *regs)
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{
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return do_sigaltstack(uss, uoss, regs->sp);
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}
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/*
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* Do a signal return; undo the signal stack.
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*/
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@ -192,7 +192,7 @@
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183 i386 getcwd sys_getcwd
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184 i386 capget sys_capget
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185 i386 capset sys_capset
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186 i386 sigaltstack ptregs_sigaltstack stub32_sigaltstack
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186 i386 sigaltstack sys_sigaltstack stub32_sigaltstack
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187 i386 sendfile sys_sendfile sys32_sendfile
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188 i386 getpmsg
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189 i386 putpmsg
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@ -137,7 +137,7 @@
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128 64 rt_sigtimedwait sys_rt_sigtimedwait
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129 64 rt_sigqueueinfo sys_rt_sigqueueinfo
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130 common rt_sigsuspend sys_rt_sigsuspend
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131 64 sigaltstack stub_sigaltstack
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131 64 sigaltstack sys_sigaltstack
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132 common utime sys_utime
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133 common mknod sys_mknod
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134 64 uselib
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@ -13,6 +13,7 @@ endmenu
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config UML_X86
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def_bool y
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select GENERIC_FIND_FIRST_BIT
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select GENERIC_SIGALTSTACK
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config 64BIT
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bool "64-bit kernel" if SUBARCH = "x86"
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@ -27,7 +27,6 @@
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#define ptregs_iopl sys_iopl
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#define ptregs_vm86old sys_vm86old
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#define ptregs_vm86 sys_vm86
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#define ptregs_sigaltstack sys_sigaltstack
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#define __SYSCALL_I386(nr, sym, compat) extern asmlinkage void sym(void) ;
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#include <asm/syscalls_32.h>
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@ -31,7 +31,6 @@
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#define stub_fork sys_fork
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#define stub_vfork sys_vfork
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#define stub_execve sys_execve
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#define stub_sigaltstack sys_sigaltstack
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#define stub_rt_sigreturn sys_rt_sigreturn
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#define __SYSCALL_COMMON(nr, sym, compat) __SYSCALL_64(nr, sym, compat)
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@ -63,6 +63,7 @@ struct getcpu_cache;
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struct old_linux_dirent;
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struct perf_event_attr;
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struct file_handle;
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struct sigaltstack;
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#include <linux/types.h>
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#include <linux/aio_abi.h>
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@ -299,6 +300,11 @@ asmlinkage long sys_personality(unsigned int personality);
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asmlinkage long sys_sigpending(old_sigset_t __user *set);
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asmlinkage long sys_sigprocmask(int how, old_sigset_t __user *set,
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old_sigset_t __user *oset);
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#ifdef CONFIG_GENERIC_SIGALTSTACK
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asmlinkage long sys_sigaltstack(const struct sigaltstack __user *uss,
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struct sigaltstack __user *uoss);
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#endif
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asmlinkage long sys_getitimer(int which, struct itimerval __user *value);
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asmlinkage long sys_setitimer(int which,
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struct itimerval __user *value,
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@ -3102,6 +3102,12 @@ do_sigaltstack (const stack_t __user *uss, stack_t __user *uoss, unsigned long s
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out:
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return error;
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}
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#ifdef CONFIG_GENERIC_SIGALTSTACK
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SYSCALL_DEFINE2(sigaltstack,const stack_t __user *,uss, stack_t __user *,uoss)
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{
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return do_sigaltstack(uss, uoss, current_user_stack_pointer());
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}
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#endif
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int restore_altstack(const stack_t __user *uss)
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{
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