childregs->regs[0] = 0; /* return value is zero */
childregs->sp = sp; /* override with new user stack pointer */
+ /*
+ * If CLONE_SETTLS is set, set "tp" in the new task to "r4",
+ * which is passed in as arg #5 to sys_clone().
+ */
+ if (clone_flags & CLONE_SETTLS)
+ childregs->tp = regs->regs[4];
+
/*
* 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;
/* 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. */
* 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)
+/* Note there is an implicit fifth argument if (clone_flags & CLONE_SETTLS). */
+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;
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;
}
#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;