diff options
Diffstat (limited to 'arch/microblaze')
| -rw-r--r-- | arch/microblaze/Kconfig | 3 | ||||
| -rw-r--r-- | arch/microblaze/include/asm/Kbuild | 1 | ||||
| -rw-r--r-- | arch/microblaze/include/asm/processor.h | 8 | ||||
| -rw-r--r-- | arch/microblaze/include/asm/syscalls.h | 16 | ||||
| -rw-r--r-- | arch/microblaze/include/asm/unistd.h | 6 | ||||
| -rw-r--r-- | arch/microblaze/kernel/entry-nommu.S | 20 | ||||
| -rw-r--r-- | arch/microblaze/kernel/entry.S | 57 | ||||
| -rw-r--r-- | arch/microblaze/kernel/process.c | 75 | ||||
| -rw-r--r-- | arch/microblaze/kernel/sys_microblaze.c | 53 | ||||
| -rw-r--r-- | arch/microblaze/kernel/syscall_table.S | 6 |
10 files changed, 52 insertions, 193 deletions
diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig index 4cba743..4bcf891 100644 --- a/arch/microblaze/Kconfig +++ b/arch/microblaze/Kconfig @@ -26,6 +26,9 @@ config MICROBLAZE select GENERIC_ATOMIC64 select GENERIC_CLOCKEVENTS select MODULES_USE_ELF_RELA + select GENERIC_KERNEL_THREAD + select GENERIC_KERNEL_EXECVE + select CLONE_BACKWARDS config SWAP def_bool n diff --git a/arch/microblaze/include/asm/Kbuild b/arch/microblaze/include/asm/Kbuild index 2957fcc..eb3a46c 100644 --- a/arch/microblaze/include/asm/Kbuild +++ b/arch/microblaze/include/asm/Kbuild @@ -4,3 +4,4 @@ header-y += elf.h generic-y += clkdev.h generic-y += exec.h generic-y += trace_clock.h +generic-y += syscalls.h diff --git a/arch/microblaze/include/asm/processor.h b/arch/microblaze/include/asm/processor.h index af2bb96..0759153 100644 --- a/arch/microblaze/include/asm/processor.h +++ b/arch/microblaze/include/asm/processor.h @@ -31,6 +31,7 @@ extern const struct seq_operations cpuinfo_op; void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp); extern void ret_from_fork(void); +extern void ret_from_kernel_thread(void); # endif /* __ASSEMBLY__ */ @@ -78,11 +79,6 @@ extern unsigned long thread_saved_pc(struct task_struct *t); extern unsigned long get_wchan(struct task_struct *p); -/* - * create a kernel thread without removing it from tasklists - */ -extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); - # define KSTK_EIP(tsk) (0) # define KSTK_ESP(tsk) (0) @@ -131,8 +127,6 @@ extern inline void release_thread(struct task_struct *dead_task) { } -extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); - /* Free current thread data structures etc. */ static inline void exit_thread(void) { diff --git a/arch/microblaze/include/asm/syscalls.h b/arch/microblaze/include/asm/syscalls.h deleted file mode 100644 index 27f2f4c..0000000 --- a/arch/microblaze/include/asm/syscalls.h +++ /dev/null @@ -1,16 +0,0 @@ -#ifndef __ASM_MICROBLAZE_SYSCALLS_H - -asmlinkage long microblaze_vfork(struct pt_regs *regs); -asmlinkage long microblaze_clone(int flags, unsigned long stack, - struct pt_regs *regs); -asmlinkage long microblaze_execve(const char __user *filenamei, - const char __user *const __user *argv, - const char __user *const __user *envp, - struct pt_regs *regs); - -asmlinkage long sys_clone(int flags, unsigned long stack, struct pt_regs *regs); -#define sys_clone sys_clone - -#include <asm-generic/syscalls.h> - -#endif /* __ASM_MICROBLAZE_SYSCALLS_H */ diff --git a/arch/microblaze/include/asm/unistd.h b/arch/microblaze/include/asm/unistd.h index 6985e6e..94d9789 100644 --- a/arch/microblaze/include/asm/unistd.h +++ b/arch/microblaze/include/asm/unistd.h @@ -422,6 +422,12 @@ #define __ARCH_WANT_SYS_SIGPROCMASK #define __ARCH_WANT_SYS_RT_SIGACTION #define __ARCH_WANT_SYS_RT_SIGSUSPEND +#define __ARCH_WANT_SYS_EXECVE +#define __ARCH_WANT_SYS_CLONE +#define __ARCH_WANT_SYS_VFORK +#ifdef CONFIG_MMU +#define __ARCH_WANT_SYS_FORK +#endif /* * "Conditional" syscalls diff --git a/arch/microblaze/kernel/entry-nommu.S b/arch/microblaze/kernel/entry-nommu.S index 75c3ea1..cb0327f 100644 --- a/arch/microblaze/kernel/entry-nommu.S +++ b/arch/microblaze/kernel/entry-nommu.S @@ -474,6 +474,14 @@ ENTRY(ret_from_fork) brid ret_to_user nop +ENTRY(ret_from_kernel_thread) + brlid r15, schedule_tail + addk r5, r0, r3 + brald r15, r20 + addk r5, r0, r19 + brid ret_to_user + addk r3, r0, r0 + work_pending: enable_irq @@ -551,18 +559,6 @@ no_work_pending: rtid r14, 0 nop -sys_vfork: - brid microblaze_vfork - addk r5, r1, r0 - -sys_clone: - brid microblaze_clone - addk r7, r1, r0 - -sys_execve: - brid microblaze_execve - addk r8, r1, r0 - sys_rt_sigreturn_wrapper: brid sys_rt_sigreturn addk r5, r1, r0 diff --git a/arch/microblaze/kernel/entry.S b/arch/microblaze/kernel/entry.S index 03f7b8c..c217367 100644 --- a/arch/microblaze/kernel/entry.S +++ b/arch/microblaze/kernel/entry.S @@ -293,24 +293,6 @@ C_ENTRY(_user_exception): swi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)) /* save stack */ addi r14, r14, 4 /* return address is 4 byte after call */ - mfs r1, rmsr - nop - andi r1, r1, MSR_UMS - bnei r1, 1f - -/* Kernel-mode state save - kernel execve */ - lwi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)); /* Reload kernel stack-ptr*/ - tophys(r1,r1); - - addik r1, r1, -PT_SIZE; /* Make room on the stack. */ - SAVE_REGS - - swi r1, r1, PT_MODE; /* pt_regs -> kernel mode */ - brid 2f; - nop; /* Fill delay slot */ - -/* User-mode state save. */ -1: lwi r1, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); /* get saved current */ tophys(r1,r1); lwi r1, r1, TS_THREAD_INFO; /* get stack from task_struct */ @@ -460,18 +442,6 @@ TRAP_return: /* Make global symbol for debugging */ nop; -/* These syscalls need access to the struct pt_regs on the stack, so we - implement them in assembly (they're basically all wrappers anyway). */ - -C_ENTRY(sys_fork_wrapper): - addi r5, r0, SIGCHLD /* Arg 0: flags */ - lwi r6, r1, PT_R1 /* Arg 1: child SP (use parent's) */ - addik r7, r1, 0 /* Arg 2: parent context */ - add r8, r0, r0 /* Arg 3: (unused) */ - add r9, r0, r0; /* Arg 4: (unused) */ - brid do_fork /* Do real work (tail-call) */ - add r10, r0, r0; /* Arg 5: (unused) */ - /* This the initial entry point for a new child thread, with an appropriate stack in place that makes it look the the child is in the middle of an syscall. This function is actually `returned to' from switch_thread @@ -479,28 +449,19 @@ C_ENTRY(sys_fork_wrapper): saved context). */ C_ENTRY(ret_from_fork): bralid r15, schedule_tail; /* ...which is schedule_tail's arg */ - add r3, r5, r0; /* switch_thread returns the prev task */ + add r5, r3, r0; /* switch_thread returns the prev task */ /* ( in the delay slot ) */ brid ret_from_trap; /* Do normal trap return */ add r3, r0, r0; /* Child's fork call should return 0. */ -C_ENTRY(sys_vfork): - brid microblaze_vfork /* Do real work (tail-call) */ - addik r5, r1, 0 - -C_ENTRY(sys_clone): - bnei r6, 1f; /* See if child SP arg (arg 1) is 0. */ - lwi r6, r1, PT_R1; /* If so, use paret's stack ptr */ -1: addik r7, r1, 0; /* Arg 2: parent context */ - lwi r9, r1, PT_R8; /* parent tid. */ - lwi r10, r1, PT_R9; /* child tid. */ - /* do_fork will pick up TLS from regs->r10. */ - brid do_fork /* Do real work (tail-call) */ - add r8, r0, r0; /* Arg 3: (unused) */ - -C_ENTRY(sys_execve): - brid microblaze_execve; /* Do real work (tail-call).*/ - addik r8, r1, 0; /* add user context as 4th arg */ +C_ENTRY(ret_from_kernel_thread): + bralid r15, schedule_tail; /* ...which is schedule_tail's arg */ + add r5, r3, r0; /* switch_thread returns the prev task */ + /* ( in the delay slot ) */ + brald r15, r20 /* fn was left in r20 */ + addk r5, r0, r19 /* ... and argument - in r19 */ + brid ret_from_trap + add r3, r0, r0 C_ENTRY(sys_rt_sigreturn_wrapper): brid sys_rt_sigreturn /* Do real work */ diff --git a/arch/microblaze/kernel/process.c b/arch/microblaze/kernel/process.c index 1944e00..40823fd 100644 --- a/arch/microblaze/kernel/process.c +++ b/arch/microblaze/kernel/process.c @@ -13,6 +13,7 @@ #include <linux/pm.h> #include <linux/tick.h> #include <linux/bitops.h> +#include <linux/ptrace.h> #include <asm/pgalloc.h> #include <asm/uaccess.h> /* for USER_DS macros */ #include <asm/cacheflush.h> @@ -119,46 +120,38 @@ void flush_thread(void) } int copy_thread(unsigned long clone_flags, unsigned long usp, - unsigned long unused, - struct task_struct *p, struct pt_regs *regs) + unsigned long arg, struct task_struct *p) { struct pt_regs *childregs = task_pt_regs(p); struct thread_info *ti = task_thread_info(p); - *childregs = *regs; - if (user_mode(regs)) + if (unlikely(p->flags & PF_KTHREAD)) { + /* if we're creating a new kernel thread then just zeroing all + * the registers. That's OK for a brand new thread.*/ + memset(childregs, 0, sizeof(struct pt_regs)); + memset(&ti->cpu_context, 0, sizeof(struct cpu_context)); + ti->cpu_context.r1 = (unsigned long)childregs; + ti->cpu_context.r20 = (unsigned long)usp; /* fn */ + ti->cpu_context.r19 = (unsigned long)arg; + childregs->pt_mode = 1; + local_save_flags(childregs->msr); +#ifdef CONFIG_MMU + ti->cpu_context.msr = childregs->msr & ~MSR_IE; +#endif + ti->cpu_context.r15 = (unsigned long)ret_from_kernel_thread - 8; + return 0; + } + *childregs = *current_pt_regs(); + if (usp) childregs->r1 = usp; - else - childregs->r1 = ((unsigned long) ti) + THREAD_SIZE; -#ifndef CONFIG_MMU memset(&ti->cpu_context, 0, sizeof(struct cpu_context)); ti->cpu_context.r1 = (unsigned long)childregs; +#ifndef CONFIG_MMU ti->cpu_context.msr = (unsigned long)childregs->msr; #else + childregs->msr |= MSR_UMS; - /* if creating a kernel thread then update the current reg (we don't - * want to use the parent's value when restoring by POP_STATE) */ - if (kernel_mode(regs)) - /* save new current on stack to use POP_STATE */ - childregs->CURRENT_TASK = (unsigned long)p; - /* if returning to user then use the parent's value of this register */ - - /* if we're creating a new kernel thread then just zeroing all - * the registers. That's OK for a brand new thread.*/ - /* Pls. note that some of them will be restored in POP_STATE */ - if (kernel_mode(regs)) - memset(&ti->cpu_context, 0, sizeof(struct cpu_context)); - /* if this thread is created for fork/vfork/clone, then we want to - * restore all the parent's context */ - /* in addition to the registers which will be restored by POP_STATE */ - else { - ti->cpu_context = *(struct cpu_context *)regs; - childregs->msr |= MSR_UMS; - } - - /* FIXME STATE_SAVE_PT_OFFSET; */ - ti->cpu_context.r1 = (unsigned long)childregs; /* we should consider the fact that childregs is a copy of the parent * regs which were saved immediately after entering the kernel state * before enabling VM. This MSR will be restored in switch_to and @@ -209,29 +202,6 @@ unsigned long thread_saved_pc(struct task_struct *tsk) } #endif -static void kernel_thread_helper(int (*fn)(void *), void *arg) -{ - fn(arg); - do_exit(-1); -} - -int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags) -{ - struct pt_regs regs; - - memset(®s, 0, sizeof(regs)); - /* store them in non-volatile registers */ - regs.r5 = (unsigned long)fn; - regs.r6 = (unsigned long)arg; - local_save_flags(regs.msr); - regs.pc = (unsigned long)kernel_thread_helper; - regs.pt_mode = 1; - - return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, - ®s, 0, NULL, NULL); -} -EXPORT_SYMBOL_GPL(kernel_thread); - unsigned long get_wchan(struct task_struct *p) { /* TBD (used by procfs) */ @@ -246,6 +216,7 @@ void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp) regs->pt_mode = 0; #ifdef CONFIG_MMU regs->msr |= MSR_UMS; + regs->msr &= ~MSR_VM; #endif } diff --git a/arch/microblaze/kernel/sys_microblaze.c b/arch/microblaze/kernel/sys_microblaze.c index 404c0f2..63647c5 100644 --- a/arch/microblaze/kernel/sys_microblaze.c +++ b/arch/microblaze/kernel/sys_microblaze.c @@ -34,38 +34,6 @@ #include <asm/syscalls.h> -asmlinkage long microblaze_vfork(struct pt_regs *regs) -{ - return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->r1, - regs, 0, NULL, NULL); -} - -asmlinkage long microblaze_clone(int flags, unsigned long stack, - struct pt_regs *regs) -{ - if (!stack) - stack = regs->r1; - return do_fork(flags, stack, regs, 0, NULL, NULL); -} - -asmlinkage long microblaze_execve(const char __user *filenamei, - const char __user *const __user *argv, - const char __user *const __user *envp, - struct pt_regs *regs) -{ - int error; - struct filename *filename; - - filename = getname(filenamei); - error = PTR_ERR(filename); - if (IS_ERR(filename)) - goto out; - error = do_execve(filename->name, argv, envp, regs); - putname(filename); -out: - return error; -} - asmlinkage long sys_mmap(unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, unsigned long fd, off_t pgoff) @@ -75,24 +43,3 @@ asmlinkage long sys_mmap(unsigned long addr, unsigned long len, return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff >> PAGE_SHIFT); } - -/* - * Do a system call from kernel instead of calling sys_execve so we - * end up with proper pt_regs. - */ -int kernel_execve(const char *filename, - const char *const argv[], - const char *const envp[]) -{ - register const char *__a __asm__("r5") = filename; - register const void *__b __asm__("r6") = argv; - register const void *__c __asm__("r7") = envp; - register unsigned long __syscall __asm__("r12") = __NR_execve; - register unsigned long __ret __asm__("r3"); - __asm__ __volatile__ ("brki r14, 0x8" - : "=r" (__ret), "=r" (__syscall) - : "1" (__syscall), "r" (__a), "r" (__b), "r" (__c) - : "r4", "r8", "r9", - "r10", "r11", "r14", "cc", "memory"); - return __ret; -} diff --git a/arch/microblaze/kernel/syscall_table.S b/arch/microblaze/kernel/syscall_table.S index 6a2b294..ff6431e 100644 --- a/arch/microblaze/kernel/syscall_table.S +++ b/arch/microblaze/kernel/syscall_table.S @@ -2,11 +2,7 @@ ENTRY(sys_call_table) .long sys_restart_syscall /* 0 - old "setup()" system call, * used for restarting */ .long sys_exit -#ifdef CONFIG_MMU - .long sys_fork_wrapper -#else - .long sys_ni_syscall -#endif + .long sys_fork .long sys_read .long sys_write .long sys_open /* 5 */ |
