diff options
Diffstat (limited to 'include/asm-sh/thread_info.h')
| -rw-r--r-- | include/asm-sh/thread_info.h | 43 |
1 files changed, 36 insertions, 7 deletions
diff --git a/include/asm-sh/thread_info.h b/include/asm-sh/thread_info.h index 7345350d98c..3ebc3f9039e 100644 --- a/include/asm-sh/thread_info.h +++ b/include/asm-sh/thread_info.h @@ -9,8 +9,8 @@ * Copyright (C) 2002 David Howells (dhowells@redhat.com) * - Incorporating suggestions made by Linus Torvalds and Dave Miller */ - #ifdef __KERNEL__ +#include <asm/page.h> #ifndef __ASSEMBLY__ #include <asm/processor.h> @@ -21,7 +21,10 @@ struct thread_info { unsigned long flags; /* low level flags */ __u32 cpu; int preempt_count; /* 0 => preemptable, <0 => BUG */ + mm_segment_t addr_limit; /* thread address space */ struct restart_block restart_block; + unsigned long previous_sp; /* sp of previous stack in case + of nested IRQ stacks */ __u8 supervisor_stack[0]; }; @@ -29,6 +32,13 @@ struct thread_info { #define PREEMPT_ACTIVE 0x10000000 +#ifdef CONFIG_4KSTACKS +#define THREAD_SIZE (PAGE_SIZE) +#else +#define THREAD_SIZE (PAGE_SIZE * 2) +#endif +#define STACK_WARN (THREAD_SIZE / 8) + /* * macros/functions for gaining access to the thread information structure */ @@ -40,6 +50,7 @@ struct thread_info { .flags = 0, \ .cpu = 0, \ .preempt_count = 1, \ + .addr_limit = KERNEL_DS, \ .restart_block = { \ .fn = do_no_restart_syscall, \ }, \ @@ -48,24 +59,42 @@ struct thread_info { #define init_thread_info (init_thread_union.thread_info) #define init_stack (init_thread_union.stack) +/* how to get the current stack pointer from C */ +register unsigned long current_stack_pointer asm("r15") __attribute_used__; + /* how to get the thread information struct from C */ static inline struct thread_info *current_thread_info(void) { struct thread_info *ti; +#ifdef CONFIG_CPU_HAS_SR_RB __asm__("stc r7_bank, %0" : "=r" (ti)); +#else + unsigned long __dummy; + + __asm__ __volatile__ ( + "mov r15, %0\n\t" + "and %1, %0\n\t" + : "=&r" (ti), "=r" (__dummy) + : "1" (~(THREAD_SIZE - 1)) + : "memory"); +#endif + return ti; } /* thread information allocation */ -#define THREAD_SIZE (2*PAGE_SIZE) -#define alloc_thread_info(ti) ((struct thread_info *) __get_free_pages(GFP_KERNEL,1)) -#define free_thread_info(ti) free_pages((unsigned long) (ti), 1) +#ifdef CONFIG_DEBUG_STACK_USAGE +#define alloc_thread_info(ti) kzalloc(THREAD_SIZE, GFP_KERNEL) +#else +#define alloc_thread_info(ti) kmalloc(THREAD_SIZE, GFP_KERNEL) +#endif +#define free_thread_info(ti) kfree(ti) #else /* !__ASSEMBLY__ */ /* how to get the thread information struct from ASM */ #define GET_THREAD_INFO(reg) \ - stc r7_bank, reg + stc r7_bank, reg #endif @@ -79,18 +108,18 @@ static inline struct thread_info *current_thread_info(void) #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ #define TIF_SIGPENDING 2 /* signal pending */ #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ +#define TIF_RESTORE_SIGMASK 4 /* restore signal mask in do_signal() */ #define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */ #define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */ #define TIF_MEMDIE 18 -#define TIF_USERSPACE 31 /* true if FS sets userspace */ #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) +#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK) #define _TIF_USEDFPU (1<<TIF_USEDFPU) #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) -#define _TIF_USERSPACE (1<<TIF_USERSPACE) #define _TIF_WORK_MASK 0x000000FE /* work to do on interrupt/exception return */ #define _TIF_ALLWORK_MASK 0x000000FF /* work to do on any return to u-space */ |