diff options
Diffstat (limited to 'arch/tile/kernel/process.c')
| -rw-r--r-- | arch/tile/kernel/process.c | 50 |
1 files changed, 26 insertions, 24 deletions
diff --git a/arch/tile/kernel/process.c b/arch/tile/kernel/process.c index 84c29111756..8430f45daea 100644 --- a/arch/tile/kernel/process.c +++ b/arch/tile/kernel/process.c @@ -214,9 +214,10 @@ int copy_thread(unsigned long clone_flags, unsigned long sp, /* * Copy the callee-saved registers from the passed pt_regs struct * into the context-switch callee-saved registers area. - * We have to restore the callee-saved registers since we may - * be cloning a userspace task with userspace register state, - * and we won't be unwinding the same kernel frames to restore them. + * This way when we start the interrupt-return sequence, the + * callee-save registers will be correctly in registers, which + * is how we assume the compiler leaves them as we start doing + * the normal return-from-interrupt path after calling C code. * Zero out the C ABI save area to mark the top of the stack. */ ksp = (unsigned long) childregs; @@ -304,15 +305,25 @@ int dump_task_regs(struct task_struct *tsk, elf_gregset_t *regs) /* Allow user processes to access the DMA SPRs */ void grant_dma_mpls(void) { +#if CONFIG_KERNEL_PL == 2 + __insn_mtspr(SPR_MPL_DMA_CPL_SET_1, 1); + __insn_mtspr(SPR_MPL_DMA_NOTIFY_SET_1, 1); +#else __insn_mtspr(SPR_MPL_DMA_CPL_SET_0, 1); __insn_mtspr(SPR_MPL_DMA_NOTIFY_SET_0, 1); +#endif } /* Forbid user processes from accessing the DMA SPRs */ void restrict_dma_mpls(void) { +#if CONFIG_KERNEL_PL == 2 + __insn_mtspr(SPR_MPL_DMA_CPL_SET_2, 1); + __insn_mtspr(SPR_MPL_DMA_NOTIFY_SET_2, 1); +#else __insn_mtspr(SPR_MPL_DMA_CPL_SET_1, 1); __insn_mtspr(SPR_MPL_DMA_NOTIFY_SET_1, 1); +#endif } /* Pause the DMA engine, then save off its state registers. */ @@ -523,19 +534,14 @@ struct task_struct *__sched _switch_to(struct task_struct *prev, * Switch kernel SP, PC, and callee-saved registers. * In the context of the new task, return the old task pointer * (i.e. the task that actually called __switch_to). - * Pass the value to use for SYSTEM_SAVE_1_0 when we reset our sp. + * Pass the value to use for SYSTEM_SAVE_K_0 when we reset our sp. */ return __switch_to(prev, next, next_current_ksp0(next)); } -long _sys_fork(struct pt_regs *regs) -{ - return do_fork(SIGCHLD, regs->sp, regs, 0, NULL, NULL); -} - -long _sys_clone(unsigned long clone_flags, unsigned long newsp, - void __user *parent_tidptr, void __user *child_tidptr, - struct pt_regs *regs) +SYSCALL_DEFINE5(clone, unsigned long, clone_flags, unsigned long, newsp, + void __user *, parent_tidptr, void __user *, child_tidptr, + struct pt_regs *, regs) { if (!newsp) newsp = regs->sp; @@ -543,18 +549,13 @@ long _sys_clone(unsigned long clone_flags, unsigned long newsp, parent_tidptr, child_tidptr); } -long _sys_vfork(struct pt_regs *regs) -{ - return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->sp, - regs, 0, NULL, NULL); -} - /* * sys_execve() executes a new program. */ -long _sys_execve(const char __user *path, - const char __user *const __user *argv, - const char __user *const __user *envp, struct pt_regs *regs) +SYSCALL_DEFINE4(execve, const char __user *, path, + const char __user *const __user *, argv, + const char __user *const __user *, envp, + struct pt_regs *, regs) { long error; char *filename; @@ -570,9 +571,10 @@ out: } #ifdef CONFIG_COMPAT -long _compat_sys_execve(const char __user *path, - const compat_uptr_t __user *argv, - const compat_uptr_t __user *envp, struct pt_regs *regs) +long compat_sys_execve(const char __user *path, + const compat_uptr_t __user *argv, + const compat_uptr_t __user *envp, + struct pt_regs *regs) { long error; char *filename; |