diff options
Diffstat (limited to 'arch/s390/kernel')
| -rw-r--r-- | arch/s390/kernel/crash_dump.c | 51 | ||||
| -rw-r--r-- | arch/s390/kernel/ptrace.c | 50 |
2 files changed, 86 insertions, 15 deletions
diff --git a/arch/s390/kernel/crash_dump.c b/arch/s390/kernel/crash_dump.c index f703d91bf72..d8f35565717 100644 --- a/arch/s390/kernel/crash_dump.c +++ b/arch/s390/kernel/crash_dump.c @@ -21,6 +21,48 @@ #define PTR_SUB(x, y) (((char *) (x)) - ((unsigned long) (y))) #define PTR_DIFF(x, y) ((unsigned long)(((char *) (x)) - ((unsigned long) (y)))) + +/* + * Return physical address for virtual address + */ +static inline void *load_real_addr(void *addr) +{ + unsigned long real_addr; + + asm volatile( + " lra %0,0(%1)\n" + " jz 0f\n" + " la %0,0\n" + "0:" + : "=a" (real_addr) : "a" (addr) : "cc"); + return (void *)real_addr; +} + +/* + * Copy up to one page to vmalloc or real memory + */ +static ssize_t copy_page_real(void *buf, void *src, size_t csize) +{ + size_t size; + + if (is_vmalloc_addr(buf)) { + BUG_ON(csize >= PAGE_SIZE); + /* If buf is not page aligned, copy first part */ + size = min(roundup(__pa(buf), PAGE_SIZE) - __pa(buf), csize); + if (size) { + if (memcpy_real(load_real_addr(buf), src, size)) + return -EFAULT; + buf += size; + src += size; + } + /* Copy second part */ + size = csize - size; + return (size) ? memcpy_real(load_real_addr(buf), src, size) : 0; + } else { + return memcpy_real(buf, src, csize); + } +} + /* * Copy one page from "oldmem" * @@ -32,6 +74,7 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf, size_t csize, unsigned long offset, int userbuf) { unsigned long src; + int rc; if (!csize) return 0; @@ -43,11 +86,11 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf, src < OLDMEM_BASE + OLDMEM_SIZE) src -= OLDMEM_BASE; if (userbuf) - copy_to_user_real((void __force __user *) buf, (void *) src, - csize); + rc = copy_to_user_real((void __force __user *) buf, + (void *) src, csize); else - memcpy_real(buf, (void *) src, csize); - return csize; + rc = copy_page_real(buf, (void *) src, csize); + return (rc == 0) ? csize : rc; } /* diff --git a/arch/s390/kernel/ptrace.c b/arch/s390/kernel/ptrace.c index a314c57f4e9..e9fadb04e3c 100644 --- a/arch/s390/kernel/ptrace.c +++ b/arch/s390/kernel/ptrace.c @@ -47,7 +47,7 @@ enum s390_regset { REGSET_GENERAL_EXTENDED, }; -void update_per_regs(struct task_struct *task) +void update_cr_regs(struct task_struct *task) { struct pt_regs *regs = task_pt_regs(task); struct thread_struct *thread = &task->thread; @@ -56,17 +56,25 @@ void update_per_regs(struct task_struct *task) #ifdef CONFIG_64BIT /* Take care of the enable/disable of transactional execution. */ if (MACHINE_HAS_TE) { - unsigned long cr0, cr0_new; + unsigned long cr[3], cr_new[3]; - __ctl_store(cr0, 0, 0); - /* set or clear transaction execution bits 8 and 9. */ + __ctl_store(cr, 0, 2); + cr_new[1] = cr[1]; + /* Set or clear transaction execution TXC/PIFO bits 8 and 9. */ if (task->thread.per_flags & PER_FLAG_NO_TE) - cr0_new = cr0 & ~(3UL << 54); + cr_new[0] = cr[0] & ~(3UL << 54); else - cr0_new = cr0 | (3UL << 54); - /* Only load control register 0 if necessary. */ - if (cr0 != cr0_new) - __ctl_load(cr0_new, 0, 0); + cr_new[0] = cr[0] | (3UL << 54); + /* Set or clear transaction execution TDC bits 62 and 63. */ + cr_new[2] = cr[2] & ~3UL; + if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND) { + if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND_TEND) + cr_new[2] |= 1UL; + else + cr_new[2] |= 2UL; + } + if (memcmp(&cr_new, &cr, sizeof(cr))) + __ctl_load(cr_new, 0, 2); } #endif /* Copy user specified PER registers */ @@ -100,14 +108,14 @@ void user_enable_single_step(struct task_struct *task) { set_tsk_thread_flag(task, TIF_SINGLE_STEP); if (task == current) - update_per_regs(task); + update_cr_regs(task); } void user_disable_single_step(struct task_struct *task) { clear_tsk_thread_flag(task, TIF_SINGLE_STEP); if (task == current) - update_per_regs(task); + update_cr_regs(task); } /* @@ -447,6 +455,26 @@ long arch_ptrace(struct task_struct *child, long request, if (!MACHINE_HAS_TE) return -EIO; child->thread.per_flags |= PER_FLAG_NO_TE; + child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND; + return 0; + case PTRACE_TE_ABORT_RAND: + if (!MACHINE_HAS_TE || (child->thread.per_flags & PER_FLAG_NO_TE)) + return -EIO; + switch (data) { + case 0UL: + child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND; + break; + case 1UL: + child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND; + child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND_TEND; + break; + case 2UL: + child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND; + child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND_TEND; + break; + default: + return -EINVAL; + } return 0; default: /* Removing high order bit from addr (only for 31 bit). */ |