diff options
| -rw-r--r-- | arch/sh/include/asm/processor.h | 12 | ||||
| -rw-r--r-- | arch/sh/include/asm/processor_32.h | 6 | ||||
| -rw-r--r-- | arch/sh/include/asm/processor_64.h | 5 | ||||
| -rw-r--r-- | arch/sh/mm/alignment.c | 30 |
4 files changed, 51 insertions, 2 deletions
diff --git a/arch/sh/include/asm/processor.h b/arch/sh/include/asm/processor.h index 87a8d1ef64e..9605e062840 100644 --- a/arch/sh/include/asm/processor.h +++ b/arch/sh/include/asm/processor.h @@ -107,6 +107,13 @@ extern unsigned int xstate_size; extern void free_thread_xstate(struct task_struct *); extern struct kmem_cache *task_xstate_cachep; +/* arch/sh/mm/alignment.c */ +extern int get_unalign_ctl(struct task_struct *, unsigned long addr); +extern int set_unalign_ctl(struct task_struct *, unsigned int val); + +#define GET_UNALIGN_CTL(tsk, addr) get_unalign_ctl((tsk), (addr)) +#define SET_UNALIGN_CTL(tsk, val) set_unalign_ctl((tsk), (val)) + /* arch/sh/mm/init.c */ extern unsigned int mem_init_done; @@ -114,6 +121,11 @@ extern unsigned int mem_init_done; const char *get_cpu_subtype(struct sh_cpuinfo *c); extern const struct seq_operations cpuinfo_op; +/* thread_struct flags */ +#define SH_THREAD_UAC_NOPRINT (1 << 0) +#define SH_THREAD_UAC_SIGBUS (1 << 1) +#define SH_THREAD_UAC_MASK (SH_THREAD_UAC_NOPRINT | SH_THREAD_UAC_SIGBUS) + /* processor boot mode configuration */ #define MODE_PIN0 (1 << 0) #define MODE_PIN1 (1 << 1) diff --git a/arch/sh/include/asm/processor_32.h b/arch/sh/include/asm/processor_32.h index 488f0a906a4..572b4eb0949 100644 --- a/arch/sh/include/asm/processor_32.h +++ b/arch/sh/include/asm/processor_32.h @@ -101,8 +101,11 @@ struct thread_struct { unsigned long sp; unsigned long pc; + /* Various thread flags, see SH_THREAD_xxx */ + unsigned long flags; + /* Save middle states of ptrace breakpoints */ - struct perf_event *ptrace_bps[HBP_NUM]; + struct perf_event *ptrace_bps[HBP_NUM]; #ifdef CONFIG_SH_DSP /* Dsp status information */ @@ -115,6 +118,7 @@ struct thread_struct { #define INIT_THREAD { \ .sp = sizeof(init_stack) + (long) &init_stack, \ + .flags = 0, \ } /* Forward declaration, a strange C thing */ diff --git a/arch/sh/include/asm/processor_64.h b/arch/sh/include/asm/processor_64.h index 7b1560f03d1..621bc4618c6 100644 --- a/arch/sh/include/asm/processor_64.h +++ b/arch/sh/include/asm/processor_64.h @@ -108,6 +108,10 @@ union thread_xstate { struct thread_struct { unsigned long sp; unsigned long pc; + + /* Various thread flags, see SH_THREAD_xxx */ + unsigned long flags; + /* This stores the address of the pt_regs built during a context switch, or of the register save area built for a kernel mode exception. It is used for backtracing the stack of a sleeping task @@ -138,6 +142,7 @@ struct thread_struct { .trap_no = 0, \ .error_code = 0, \ .address = 0, \ + .flags = 0, \ } /* diff --git a/arch/sh/mm/alignment.c b/arch/sh/mm/alignment.c index 00fb9e3f057..b2595b8548e 100644 --- a/arch/sh/mm/alignment.c +++ b/arch/sh/mm/alignment.c @@ -14,6 +14,7 @@ #include <linux/proc_fs.h> #include <linux/uaccess.h> #include <asm/alignment.h> +#include <asm/processor.h> static unsigned long se_user; static unsigned long se_sys; @@ -59,9 +60,36 @@ void inc_unaligned_kernel_access(void) se_sys++; } +/* + * This defaults to the global policy which can be set from the command + * line, while processes can overload their preferences via prctl(). + */ unsigned int unaligned_user_action(void) { - return se_usermode; + unsigned int action = se_usermode; + + if (current->thread.flags & SH_THREAD_UAC_SIGBUS) { + action &= ~UM_FIXUP; + action |= UM_SIGNAL; + } + + if (current->thread.flags & SH_THREAD_UAC_NOPRINT) + action &= ~UM_WARN; + + return action; +} + +int get_unalign_ctl(struct task_struct *tsk, unsigned long addr) +{ + return put_user(tsk->thread.flags & SH_THREAD_UAC_MASK, + (unsigned int __user *)addr); +} + +int set_unalign_ctl(struct task_struct *tsk, unsigned int val) +{ + tsk->thread.flags = (tsk->thread.flags & ~SH_THREAD_UAC_MASK) | + (val & SH_THREAD_UAC_MASK); + return 0; } void unaligned_fixups_notify(struct task_struct *tsk, insn_size_t insn, |