From 0ad9513d0f81584c25f3fc7ff582c382cc1a93f7 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Sat, 27 Oct 2012 00:13:51 -0400 Subject: [PATCH] sh: switch to generic fork/vfork/clone Signed-off-by: Al Viro --- arch/sh/include/asm/syscalls_32.h | 10 ------ arch/sh/include/asm/syscalls_64.h | 13 -------- arch/sh/include/asm/unistd.h | 3 ++ arch/sh/kernel/process_32.c | 52 +++---------------------------- arch/sh/kernel/process_64.c | 43 +++---------------------- 5 files changed, 11 insertions(+), 110 deletions(-) diff --git a/arch/sh/include/asm/syscalls_32.h b/arch/sh/include/asm/syscalls_32.h index d2f89f1741f..cc25485996b 100644 --- a/arch/sh/include/asm/syscalls_32.h +++ b/arch/sh/include/asm/syscalls_32.h @@ -9,16 +9,6 @@ struct pt_regs; -asmlinkage int sys_fork(unsigned long r4, unsigned long r5, - unsigned long r6, unsigned long r7, - struct pt_regs __regs); -asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, - unsigned long parent_tidptr, - unsigned long child_tidptr, - struct pt_regs __regs); -asmlinkage int sys_vfork(unsigned long r4, unsigned long r5, - unsigned long r6, unsigned long r7, - struct pt_regs __regs); asmlinkage int sys_sigsuspend(old_sigset_t mask); asmlinkage int sys_sigaction(int sig, const struct old_sigaction __user *act, struct old_sigaction __user *oact); diff --git a/arch/sh/include/asm/syscalls_64.h b/arch/sh/include/asm/syscalls_64.h index 3fedd9f1fab..d62e8eb22f7 100644 --- a/arch/sh/include/asm/syscalls_64.h +++ b/arch/sh/include/asm/syscalls_64.h @@ -9,19 +9,6 @@ struct pt_regs; -asmlinkage int sys_fork(unsigned long r2, unsigned long r3, - unsigned long r4, unsigned long r5, - unsigned long r6, unsigned long r7, - struct pt_regs *pregs); -asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, - unsigned long r4, unsigned long r5, - unsigned long r6, unsigned long r7, - struct pt_regs *pregs); -asmlinkage int sys_vfork(unsigned long r2, unsigned long r3, - unsigned long r4, unsigned long r5, - unsigned long r6, unsigned long r7, - struct pt_regs *pregs); - /* Misc syscall related bits */ asmlinkage long long do_syscall_trace_enter(struct pt_regs *regs); asmlinkage void do_syscall_trace_leave(struct pt_regs *regs); diff --git a/arch/sh/include/asm/unistd.h b/arch/sh/include/asm/unistd.h index f1f4775766a..43d3f26b2ea 100644 --- a/arch/sh/include/asm/unistd.h +++ b/arch/sh/include/asm/unistd.h @@ -29,6 +29,9 @@ # define __ARCH_WANT_SYS_SIGPROCMASK # define __ARCH_WANT_SYS_RT_SIGACTION # define __ARCH_WANT_SYS_EXECVE +# define __ARCH_WANT_SYS_FORK +# define __ARCH_WANT_SYS_VFORK +# define __ARCH_WANT_SYS_CLONE /* * "Conditional" syscalls diff --git a/arch/sh/kernel/process_32.c b/arch/sh/kernel/process_32.c index fce8029de92..1786d16b6c6 100644 --- a/arch/sh/kernel/process_32.c +++ b/arch/sh/kernel/process_32.c @@ -129,7 +129,7 @@ asmlinkage void ret_from_kernel_thread(void); int copy_thread(unsigned long clone_flags, unsigned long usp, unsigned long arg, - struct task_struct *p, struct pt_regs *regs) + struct task_struct *p, struct pt_regs *unused) { struct thread_info *ti = task_thread_info(p); struct pt_regs *childregs; @@ -164,9 +164,10 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, p->fpu_counter = 0; return 0; } - *childregs = *regs; + *childregs = *current_pt_regs(); - childregs->regs[15] = usp; + if (usp) + childregs->regs[15] = usp; ti->addr_limit = USER_DS; if (clone_flags & CLONE_SETTLS) @@ -217,51 +218,6 @@ __switch_to(struct task_struct *prev, struct task_struct *next) return prev; } -asmlinkage int sys_fork(unsigned long r4, unsigned long r5, - unsigned long r6, unsigned long r7, - struct pt_regs __regs) -{ -#ifdef CONFIG_MMU - struct pt_regs *regs = RELOC_HIDE(&__regs, 0); - return do_fork(SIGCHLD, regs->regs[15], regs, 0, NULL, NULL); -#else - /* fork almost works, enough to trick you into looking elsewhere :-( */ - return -EINVAL; -#endif -} - -asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, - unsigned long parent_tidptr, - unsigned long child_tidptr, - struct pt_regs __regs) -{ - struct pt_regs *regs = RELOC_HIDE(&__regs, 0); - if (!newsp) - newsp = regs->regs[15]; - return do_fork(clone_flags, newsp, regs, 0, - (int __user *)parent_tidptr, - (int __user *)child_tidptr); -} - -/* - * This is trivial, and on the face of it looks like it - * could equally well be done in user mode. - * - * Not so, for quite unobvious reasons - register pressure. - * In user mode vfork() cannot have a stack frame, and if - * done by calling the "clone()" system call directly, you - * do not have enough call-clobbered registers to hold all - * the information you need. - */ -asmlinkage int sys_vfork(unsigned long r4, unsigned long r5, - unsigned long r6, unsigned long r7, - struct pt_regs __regs) -{ - struct pt_regs *regs = RELOC_HIDE(&__regs, 0); - return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->regs[15], regs, - 0, NULL, NULL); -} - unsigned long get_wchan(struct task_struct *p) { unsigned long pc; diff --git a/arch/sh/kernel/process_64.c b/arch/sh/kernel/process_64.c index 3a0f3fd3bb5..d5c86a8a384 100644 --- a/arch/sh/kernel/process_64.c +++ b/arch/sh/kernel/process_64.c @@ -383,7 +383,7 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, save_fpu(current); disable_fpu(); last_task_used_math = NULL; - regs->sr |= SR_FD; + current_pt_regs()->sr |= SR_FD; } #endif /* Copy from sh version */ @@ -399,7 +399,7 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, p->thread.pc = (unsigned long) ret_from_kernel_thread; return 0; } - *childregs = *regs; + *childregs = *current_pt_regs(); /* * Sign extend the edited stack. @@ -407,7 +407,8 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, * 32-bit wide and context switch must take care * of NEFF sign extension. */ - childregs->regs[15] = neff_sign_extend(usp); + if (usp) + childregs->regs[15] = neff_sign_extend(usp); p->thread.uregs = childregs; childregs->regs[9] = 0; /* Set return value for child */ @@ -418,42 +419,6 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, return 0; } -asmlinkage int sys_fork(unsigned long r2, unsigned long r3, - unsigned long r4, unsigned long r5, - unsigned long r6, unsigned long r7, - struct pt_regs *pregs) -{ - return do_fork(SIGCHLD, pregs->regs[15], pregs, 0, 0, 0); -} - -asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, - unsigned long r4, unsigned long r5, - unsigned long r6, unsigned long r7, - struct pt_regs *pregs) -{ - if (!newsp) - newsp = pregs->regs[15]; - return do_fork(clone_flags, newsp, pregs, 0, 0, 0); -} - -/* - * This is trivial, and on the face of it looks like it - * could equally well be done in user mode. - * - * Not so, for quite unobvious reasons - register pressure. - * In user mode vfork() cannot have a stack frame, and if - * done by calling the "clone()" system call directly, you - * do not have enough call-clobbered registers to hold all - * the information you need. - */ -asmlinkage int sys_vfork(unsigned long r2, unsigned long r3, - unsigned long r4, unsigned long r5, - unsigned long r6, unsigned long r7, - struct pt_regs *pregs) -{ - return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, pregs->regs[15], pregs, 0, 0, 0); -} - #ifdef CONFIG_FRAME_POINTER static int in_sh64_switch_to(unsigned long pc) { -- 2.41.0