| /* |
| * Ptrace user space interface. |
| * |
| * Copyright IBM Corp. 1999, 2010 |
| * Author(s): Denis Joseph Barrow |
| * Martin Schwidefsky (schwidefsky@de.ibm.com) |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/sched.h> |
| #include <linux/mm.h> |
| #include <linux/smp.h> |
| #include <linux/errno.h> |
| #include <linux/ptrace.h> |
| #include <linux/user.h> |
| #include <linux/security.h> |
| #include <linux/audit.h> |
| #include <linux/signal.h> |
| #include <linux/elf.h> |
| #include <linux/regset.h> |
| #include <linux/tracehook.h> |
| #include <linux/seccomp.h> |
| #include <linux/compat.h> |
| #include <trace/syscall.h> |
| #include <asm/segment.h> |
| #include <asm/page.h> |
| #include <asm/pgtable.h> |
| #include <asm/pgalloc.h> |
| #include <asm/uaccess.h> |
| #include <asm/unistd.h> |
| #include <asm/switch_to.h> |
| #include "entry.h" |
| |
| #ifdef CONFIG_COMPAT |
| #include "compat_ptrace.h" |
| #endif |
| |
| #define CREATE_TRACE_POINTS |
| #include <trace/events/syscalls.h> |
| |
| enum s390_regset { |
| REGSET_GENERAL, |
| REGSET_FP, |
| REGSET_LAST_BREAK, |
| REGSET_SYSTEM_CALL, |
| REGSET_GENERAL_EXTENDED, |
| }; |
| |
| void update_per_regs(struct task_struct *task) |
| { |
| struct pt_regs *regs = task_pt_regs(task); |
| struct thread_struct *thread = &task->thread; |
| struct per_regs old, new; |
| |
| /* Copy user specified PER registers */ |
| new.control = thread->per_user.control; |
| new.start = thread->per_user.start; |
| new.end = thread->per_user.end; |
| |
| /* merge TIF_SINGLE_STEP into user specified PER registers. */ |
| if (test_tsk_thread_flag(task, TIF_SINGLE_STEP)) { |
| new.control |= PER_EVENT_IFETCH; |
| new.start = 0; |
| new.end = PSW_ADDR_INSN; |
| } |
| |
| /* Take care of the PER enablement bit in the PSW. */ |
| if (!(new.control & PER_EVENT_MASK)) { |
| regs->psw.mask &= ~PSW_MASK_PER; |
| return; |
| } |
| regs->psw.mask |= PSW_MASK_PER; |
| __ctl_store(old, 9, 11); |
| if (memcmp(&new, &old, sizeof(struct per_regs)) != 0) |
| __ctl_load(new, 9, 11); |
| } |
| |
| void user_enable_single_step(struct task_struct *task) |
| { |
| set_tsk_thread_flag(task, TIF_SINGLE_STEP); |
| if (task == current) |
| update_per_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); |
| } |
| |
| /* |
| * Called by kernel/ptrace.c when detaching.. |
| * |
| * Clear all debugging related fields. |
| */ |
| void ptrace_disable(struct task_struct *task) |
| { |
| memset(&task->thread.per_user, 0, sizeof(task->thread.per_user)); |
| memset(&task->thread.per_event, 0, sizeof(task->thread.per_event)); |
| clear_tsk_thread_flag(task, TIF_SINGLE_STEP); |
| clear_tsk_thread_flag(task, TIF_PER_TRAP); |
| } |
| |
| #ifndef CONFIG_64BIT |
| # define __ADDR_MASK 3 |
| #else |
| # define __ADDR_MASK 7 |
| #endif |
| |
| static inline unsigned long __peek_user_per(struct task_struct *child, |
| addr_t addr) |
| { |
| struct per_struct_kernel *dummy = NULL; |
| |
| if (addr == (addr_t) &dummy->cr9) |
| /* Control bits of the active per set. */ |
| return test_thread_flag(TIF_SINGLE_STEP) ? |
| PER_EVENT_IFETCH : child->thread.per_user.control; |
| else if (addr == (addr_t) &dummy->cr10) |
| /* Start address of the active per set. */ |
| return test_thread_flag(TIF_SINGLE_STEP) ? |
| 0 : child->thread.per_user.start; |
| else if (addr == (addr_t) &dummy->cr11) |
| /* End address of the active per set. */ |
| return test_thread_flag(TIF_SINGLE_STEP) ? |
| PSW_ADDR_INSN : child->thread.per_user.end; |
| else if (addr == (addr_t) &dummy->bits) |
| /* Single-step bit. */ |
| return test_thread_flag(TIF_SINGLE_STEP) ? |
| (1UL << (BITS_PER_LONG - 1)) : 0; |
| else if (addr == (addr_t) &dummy->starting_addr) |
| /* Start address of the user specified per set. */ |
| return child->thread.per_user.start; |
| else if (addr == (addr_t) &dummy->ending_addr) |
| /* End address of the user specified per set. */ |
| return child->thread.per_user.end; |
| else if (addr == (addr_t) &dummy->perc_atmid) |
| /* PER code, ATMID and AI of the last PER trap */ |
| return (unsigned long) |
| child->thread.per_event.cause << (BITS_PER_LONG - 16); |
| else if (addr == (addr_t) &dummy->address) |
| /* Address of the last PER trap */ |
| return child->thread.per_event.address; |
| else if (addr == (addr_t) &dummy->access_id) |
| /* Access id of the last PER trap */ |
| return (unsigned long) |
| child->thread.per_event.paid << (BITS_PER_LONG - 8); |
| return 0; |
| } |
| |
| /* |
| * Read the word at offset addr from the user area of a process. The |
| * trouble here is that the information is littered over different |
| * locations. The process registers are found on the kernel stack, |
| * the floating point stuff and the trace settings are stored in |
| * the task structure. In addition the different structures in |
| * struct user contain pad bytes that should be read as zeroes. |
| * Lovely... |
| */ |
| static unsigned long __peek_user(struct task_struct *child, addr_t addr) |
| { |
| struct user *dummy = NULL; |
| addr_t offset, tmp; |
| |
| if (addr < (addr_t) &dummy->regs.acrs) { |
| /* |
| * psw and gprs are stored on the stack |
| */ |
| tmp = *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr); |
| if (addr == (addr_t) &dummy->regs.psw.mask) |
| /* Return a clean psw mask. */ |
| tmp = psw_user_bits | (tmp & PSW_MASK_USER); |
| |
| } else if (addr < (addr_t) &dummy->regs.orig_gpr2) { |
| /* |
| * access registers are stored in the thread structure |
| */ |
| offset = addr - (addr_t) &dummy->regs.acrs; |
| #ifdef CONFIG_64BIT |
| /* |
| * Very special case: old & broken 64 bit gdb reading |
| * from acrs[15]. Result is a 64 bit value. Read the |
| * 32 bit acrs[15] value and shift it by 32. Sick... |
| */ |
| if (addr == (addr_t) &dummy->regs.acrs[15]) |
| tmp = ((unsigned long) child->thread.acrs[15]) << 32; |
| else |
| #endif |
| tmp = *(addr_t *)((addr_t) &child->thread.acrs + offset); |
| |
| } else if (addr == (addr_t) &dummy->regs.orig_gpr2) { |
| /* |
| * orig_gpr2 is stored on the kernel stack |
| */ |
| tmp = (addr_t) task_pt_regs(child)->orig_gpr2; |
| |
| } else if (addr < (addr_t) &dummy->regs.fp_regs) { |
| /* |
| * prevent reads of padding hole between |
| * orig_gpr2 and fp_regs on s390. |
| */ |
| tmp = 0; |
| |
| } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) { |
| /* |
| * floating point regs. are stored in the thread structure |
| */ |
| offset = addr - (addr_t) &dummy->regs.fp_regs; |
| tmp = *(addr_t *)((addr_t) &child->thread.fp_regs + offset); |
| if (addr == (addr_t) &dummy->regs.fp_regs.fpc) |
| tmp &= (unsigned long) FPC_VALID_MASK |
| << (BITS_PER_LONG - 32); |
| |
| } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) { |
| /* |
| * Handle access to the per_info structure. |
| */ |
| addr -= (addr_t) &dummy->regs.per_info; |
| tmp = __peek_user_per(child, addr); |
| |
| } else |
| tmp = 0; |
| |
| return tmp; |
| } |
| |
| static int |
| peek_user(struct task_struct *child, addr_t addr, addr_t data) |
| { |
| addr_t tmp, mask; |
| |
| /* |
| * Stupid gdb peeks/pokes the access registers in 64 bit with |
| * an alignment of 4. Programmers from hell... |
| */ |
| mask = __ADDR_MASK; |
| #ifdef CONFIG_64BIT |
| if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs && |
| addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2) |
| mask = 3; |
| #endif |
| if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK) |
| return -EIO; |
| |
| tmp = __peek_user(child, addr); |
| return put_user(tmp, (addr_t __user *) data); |
| } |
| |
| static inline void __poke_user_per(struct task_struct *child, |
| addr_t addr, addr_t data) |
| { |
| struct per_struct_kernel *dummy = NULL; |
| |
| /* |
| * There are only three fields in the per_info struct that the |
| * debugger user can write to. |
| * 1) cr9: the debugger wants to set a new PER event mask |
| * 2) starting_addr: the debugger wants to set a new starting |
| * address to use with the PER event mask. |
| * 3) ending_addr: the debugger wants to set a new ending |
| * address to use with the PER event mask. |
| * The user specified PER event mask and the start and end |
| * addresses are used only if single stepping is not in effect. |
| * Writes to any other field in per_info are ignored. |
| */ |
| if (addr == (addr_t) &dummy->cr9) |
| /* PER event mask of the user specified per set. */ |
| child->thread.per_user.control = |
| data & (PER_EVENT_MASK | PER_CONTROL_MASK); |
| else if (addr == (addr_t) &dummy->starting_addr) |
| /* Starting address of the user specified per set. */ |
| child->thread.per_user.start = data; |
| else if (addr == (addr_t) &dummy->ending_addr) |
| /* Ending address of the user specified per set. */ |
| child->thread.per_user.end = data; |
| } |
| |
| /* |
| * Write a word to the user area of a process at location addr. This |
| * operation does have an additional problem compared to peek_user. |
| * Stores to the program status word and on the floating point |
| * control register needs to get checked for validity. |
| */ |
| static int __poke_user(struct task_struct *child, addr_t addr, addr_t data) |
| { |
| struct user *dummy = NULL; |
| addr_t offset; |
| |
| if (addr < (addr_t) &dummy->regs.acrs) { |
| /* |
| * psw and gprs are stored on the stack |
| */ |
| if (addr == (addr_t) &dummy->regs.psw.mask && |
| ((data & ~PSW_MASK_USER) != psw_user_bits || |
| ((data & PSW_MASK_EA) && !(data & PSW_MASK_BA)))) |
| /* Invalid psw mask. */ |
| return -EINVAL; |
| *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr) = data; |
| |
| } else if (addr < (addr_t) (&dummy->regs.orig_gpr2)) { |
| /* |
| * access registers are stored in the thread structure |
| */ |
| offset = addr - (addr_t) &dummy->regs.acrs; |
| #ifdef CONFIG_64BIT |
| /* |
| * Very special case: old & broken 64 bit gdb writing |
| * to acrs[15] with a 64 bit value. Ignore the lower |
| * half of the value and write the upper 32 bit to |
| * acrs[15]. Sick... |
| */ |
| if (addr == (addr_t) &dummy->regs.acrs[15]) |
| child->thread.acrs[15] = (unsigned int) (data >> 32); |
| else |
| #endif |
| *(addr_t *)((addr_t) &child->thread.acrs + offset) = data; |
| |
| } else if (addr == (addr_t) &dummy->regs.orig_gpr2) { |
| /* |
| * orig_gpr2 is stored on the kernel stack |
| */ |
| task_pt_regs(child)->orig_gpr2 = data; |
| |
| } else if (addr < (addr_t) &dummy->regs.fp_regs) { |
| /* |
| * prevent writes of padding hole between |
| * orig_gpr2 and fp_regs on s390. |
| */ |
| return 0; |
| |
| } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) { |
| /* |
| * floating point regs. are stored in the thread structure |
| */ |
| if (addr == (addr_t) &dummy->regs.fp_regs.fpc && |
| (data & ~((unsigned long) FPC_VALID_MASK |
| << (BITS_PER_LONG - 32))) != 0) |
| return -EINVAL; |
| offset = addr - (addr_t) &dummy->regs.fp_regs; |
| *(addr_t *)((addr_t) &child->thread.fp_regs + offset) = data; |
| |
| } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) { |
| /* |
| * Handle access to the per_info structure. |
| */ |
| addr -= (addr_t) &dummy->regs.per_info; |
| __poke_user_per(child, addr, data); |
| |
| } |
| |
| return 0; |
| } |
| |
| static int poke_user(struct task_struct *child, addr_t addr, addr_t data) |
| { |
| addr_t mask; |
| |
| /* |
| * Stupid gdb peeks/pokes the access registers in 64 bit with |
| * an alignment of 4. Programmers from hell indeed... |
| */ |
| mask = __ADDR_MASK; |
| #ifdef CONFIG_64BIT |
| if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs && |
| addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2) |
| mask = 3; |
| #endif |
| if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK) |
| return -EIO; |
| |
| return __poke_user(child, addr, data); |
| } |
| |
| long arch_ptrace(struct task_struct *child, long request, |
| unsigned long addr, unsigned long data) |
| { |
| ptrace_area parea; |
| int copied, ret; |
| |
| switch (request) { |
| case PTRACE_PEEKUSR: |
| /* read the word at location addr in the USER area. */ |
| return peek_user(child, addr, data); |
| |
| case PTRACE_POKEUSR: |
| /* write the word at location addr in the USER area */ |
| return poke_user(child, addr, data); |
| |
| case PTRACE_PEEKUSR_AREA: |
| case PTRACE_POKEUSR_AREA: |
| if (copy_from_user(&parea, (void __force __user *) addr, |
| sizeof(parea))) |
| return -EFAULT; |
| addr = parea.kernel_addr; |
| data = parea.process_addr; |
| copied = 0; |
| while (copied < parea.len) { |
| if (request == PTRACE_PEEKUSR_AREA) |
| ret = peek_user(child, addr, data); |
| else { |
| addr_t utmp; |
| if (get_user(utmp, |
| (addr_t __force __user *) data)) |
| return -EFAULT; |
| ret = poke_user(child, addr, utmp); |
| } |
| if (ret) |
| return ret; |
| addr += sizeof(unsigned long); |
| data += sizeof(unsigned long); |
| copied += sizeof(unsigned long); |
| } |
| return 0; |
| case PTRACE_GET_LAST_BREAK: |
| put_user(task_thread_info(child)->last_break, |
| (unsigned long __user *) data); |
| return 0; |
| default: |
| /* Removing high order bit from addr (only for 31 bit). */ |
| addr &= PSW_ADDR_INSN; |
| return ptrace_request(child, request, addr, data); |
| } |
| } |
| |
| #ifdef CONFIG_COMPAT |
| /* |
| * Now the fun part starts... a 31 bit program running in the |
| * 31 bit emulation tracing another program. PTRACE_PEEKTEXT, |
| * PTRACE_PEEKDATA, PTRACE_POKETEXT and PTRACE_POKEDATA are easy |
| * to handle, the difference to the 64 bit versions of the requests |
| * is that the access is done in multiples of 4 byte instead of |
| * 8 bytes (sizeof(unsigned long) on 31/64 bit). |
| * The ugly part are PTRACE_PEEKUSR, PTRACE_PEEKUSR_AREA, |
| * PTRACE_POKEUSR and PTRACE_POKEUSR_AREA. If the traced program |
| * is a 31 bit program too, the content of struct user can be |
| * emulated. A 31 bit program peeking into the struct user of |
| * a 64 bit program is a no-no. |
| */ |
| |
| /* |
| * Same as peek_user_per but for a 31 bit program. |
| */ |
| static inline __u32 __peek_user_per_compat(struct task_struct *child, |
| addr_t addr) |
| { |
| struct compat_per_struct_kernel *dummy32 = NULL; |
| |
| if (addr == (addr_t) &dummy32->cr9) |
| /* Control bits of the active per set. */ |
| return (__u32) test_thread_flag(TIF_SINGLE_STEP) ? |
| PER_EVENT_IFETCH : child->thread.per_user.control; |
| else if (addr == (addr_t) &dummy32->cr10) |
| /* Start address of the active per set. */ |
| return (__u32) test_thread_flag(TIF_SINGLE_STEP) ? |
| 0 : child->thread.per_user.start; |
| else if (addr == (addr_t) &dummy32->cr11) |
| /* End address of the active per set. */ |
| return test_thread_flag(TIF_SINGLE_STEP) ? |
| PSW32_ADDR_INSN : child->thread.per_user.end; |
| else if (addr == (addr_t) &dummy32->bits) |
| /* Single-step bit. */ |
| return (__u32) test_thread_flag(TIF_SINGLE_STEP) ? |
| 0x80000000 : 0; |
| else if (addr == (addr_t) &dummy32->starting_addr) |
| /* Start address of the user specified per set. */ |
| return (__u32) child->thread.per_user.start; |
| else if (addr == (addr_t) &dummy32->ending_addr) |
| /* End address of the user specified per set. */ |
| return (__u32) child->thread.per_user.end; |
| else if (addr == (addr_t) &dummy32->perc_atmid) |
| /* PER code, ATMID and AI of the last PER trap */ |
| return (__u32) child->thread.per_event.cause << 16; |
| else if (addr == (addr_t) &dummy32->address) |
| /* Address of the last PER trap */ |
| return (__u32) child->thread.per_event.address; |
| else if (addr == (addr_t) &dummy32->access_id) |
| /* Access id of the last PER trap */ |
| return (__u32) child->thread.per_event.paid << 24; |
| return 0; |
| } |
| |
| /* |
| * Same as peek_user but for a 31 bit program. |
| */ |
| static u32 __peek_user_compat(struct task_struct *child, addr_t addr) |
| { |
| struct compat_user *dummy32 = NULL; |
| addr_t offset; |
| __u32 tmp; |
| |
| if (addr < (addr_t) &dummy32->regs.acrs) { |
| struct pt_regs *regs = task_pt_regs(child); |
| /* |
| * psw and gprs are stored on the stack |
| */ |
| if (addr == (addr_t) &dummy32->regs.psw.mask) { |
| /* Fake a 31 bit psw mask. */ |
| tmp = (__u32)(regs->psw.mask >> 32); |
| tmp = psw32_user_bits | (tmp & PSW32_MASK_USER); |
| } else if (addr == (addr_t) &dummy32->regs.psw.addr) { |
| /* Fake a 31 bit psw address. */ |
| tmp = (__u32) regs->psw.addr | |
| (__u32)(regs->psw.mask & PSW_MASK_BA); |
| } else { |
| /* gpr 0-15 */ |
| tmp = *(__u32 *)((addr_t) ®s->psw + addr*2 + 4); |
| } |
| } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) { |
| /* |
| * access registers are stored in the thread structure |
| */ |
| offset = addr - (addr_t) &dummy32->regs.acrs; |
| tmp = *(__u32*)((addr_t) &child->thread.acrs + offset); |
| |
| } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) { |
| /* |
| * orig_gpr2 is stored on the kernel stack |
| */ |
| tmp = *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4); |
| |
| } else if (addr < (addr_t) &dummy32->regs.fp_regs) { |
| /* |
| * prevent reads of padding hole between |
| * orig_gpr2 and fp_regs on s390. |
| */ |
| tmp = 0; |
| |
| } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) { |
| /* |
| * floating point regs. are stored in the thread structure |
| */ |
| offset = addr - (addr_t) &dummy32->regs.fp_regs; |
| tmp = *(__u32 *)((addr_t) &child->thread.fp_regs + offset); |
| |
| } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) { |
| /* |
| * Handle access to the per_info structure. |
| */ |
| addr -= (addr_t) &dummy32->regs.per_info; |
| tmp = __peek_user_per_compat(child, addr); |
| |
| } else |
| tmp = 0; |
| |
| return tmp; |
| } |
| |
| static int peek_user_compat(struct task_struct *child, |
| addr_t addr, addr_t data) |
| { |
| __u32 tmp; |
| |
| if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user) - 3) |
| return -EIO; |
| |
| tmp = __peek_user_compat(child, addr); |
| return put_user(tmp, (__u32 __user *) data); |
| } |
| |
| /* |
| * Same as poke_user_per but for a 31 bit program. |
| */ |
| static inline void __poke_user_per_compat(struct task_struct *child, |
| addr_t addr, __u32 data) |
| { |
| struct compat_per_struct_kernel *dummy32 = NULL; |
| |
| if (addr == (addr_t) &dummy32->cr9) |
| /* PER event mask of the user specified per set. */ |
| child->thread.per_user.control = |
| data & (PER_EVENT_MASK | PER_CONTROL_MASK); |
| else if (addr == (addr_t) &dummy32->starting_addr) |
| /* Starting address of the user specified per set. */ |
| child->thread.per_user.start = data; |
| else if (addr == (addr_t) &dummy32->ending_addr) |
| /* Ending address of the user specified per set. */ |
| child->thread.per_user.end = data; |
| } |
| |
| /* |
| * Same as poke_user but for a 31 bit program. |
| */ |
| static int __poke_user_compat(struct task_struct *child, |
| addr_t addr, addr_t data) |
| { |
| struct compat_user *dummy32 = NULL; |
| __u32 tmp = (__u32) data; |
| addr_t offset; |
| |
| if (addr < (addr_t) &dummy32->regs.acrs) { |
| struct pt_regs *regs = task_pt_regs(child); |
| /* |
| * psw, gprs, acrs and orig_gpr2 are stored on the stack |
| */ |
| if (addr == (addr_t) &dummy32->regs.psw.mask) { |
| /* Build a 64 bit psw mask from 31 bit mask. */ |
| if ((tmp & ~PSW32_MASK_USER) != psw32_user_bits) |
| /* Invalid psw mask. */ |
| return -EINVAL; |
| regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) | |
| (regs->psw.mask & PSW_MASK_BA) | |
| (__u64)(tmp & PSW32_MASK_USER) << 32; |
| } else if (addr == (addr_t) &dummy32->regs.psw.addr) { |
| /* Build a 64 bit psw address from 31 bit address. */ |
| regs->psw.addr = (__u64) tmp & PSW32_ADDR_INSN; |
| /* Transfer 31 bit amode bit to psw mask. */ |
| regs->psw.mask = (regs->psw.mask & ~PSW_MASK_BA) | |
| (__u64)(tmp & PSW32_ADDR_AMODE); |
| } else { |
| /* gpr 0-15 */ |
| *(__u32*)((addr_t) ®s->psw + addr*2 + 4) = tmp; |
| } |
| } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) { |
| /* |
| * access registers are stored in the thread structure |
| */ |
| offset = addr - (addr_t) &dummy32->regs.acrs; |
| *(__u32*)((addr_t) &child->thread.acrs + offset) = tmp; |
| |
| } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) { |
| /* |
| * orig_gpr2 is stored on the kernel stack |
| */ |
| *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4) = tmp; |
| |
| } else if (addr < (addr_t) &dummy32->regs.fp_regs) { |
| /* |
| * prevent writess of padding hole between |
| * orig_gpr2 and fp_regs on s390. |
| */ |
| return 0; |
| |
| } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) { |
| /* |
| * floating point regs. are stored in the thread structure |
| */ |
| if (addr == (addr_t) &dummy32->regs.fp_regs.fpc && |
| (tmp & ~FPC_VALID_MASK) != 0) |
| /* Invalid floating point control. */ |
| return -EINVAL; |
| offset = addr - (addr_t) &dummy32->regs.fp_regs; |
| *(__u32 *)((addr_t) &child->thread.fp_regs + offset) = tmp; |
| |
| } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) { |
| /* |
| * Handle access to the per_info structure. |
| */ |
| addr -= (addr_t) &dummy32->regs.per_info; |
| __poke_user_per_compat(child, addr, data); |
| } |
| |
| return 0; |
| } |
| |
| static int poke_user_compat(struct task_struct *child, |
| addr_t addr, addr_t data) |
| { |
| if (!is_compat_task() || (addr & 3) || |
| addr > sizeof(struct compat_user) - 3) |
| return -EIO; |
| |
| return __poke_user_compat(child, addr, data); |
| } |
| |
| long compat_arch_ptrace(struct task_struct *child, compat_long_t request, |
| compat_ulong_t caddr, compat_ulong_t cdata) |
| { |
| unsigned long addr = caddr; |
| unsigned long data = cdata; |
| compat_ptrace_area parea; |
| int copied, ret; |
| |
| switch (request) { |
| case PTRACE_PEEKUSR: |
| /* read the word at location addr in the USER area. */ |
| return peek_user_compat(child, addr, data); |
| |
| case PTRACE_POKEUSR: |
| /* write the word at location addr in the USER area */ |
| return poke_user_compat(child, addr, data); |
| |
| case PTRACE_PEEKUSR_AREA: |
| case PTRACE_POKEUSR_AREA: |
| if (copy_from_user(&parea, (void __force __user *) addr, |
| sizeof(parea))) |
| return -EFAULT; |
| addr = parea.kernel_addr; |
| data = parea.process_addr; |
| copied = 0; |
| while (copied < parea.len) { |
| if (request == PTRACE_PEEKUSR_AREA) |
| ret = peek_user_compat(child, addr, data); |
| else { |
| __u32 utmp; |
| if (get_user(utmp, |
| (__u32 __force __user *) data)) |
| return -EFAULT; |
| ret = poke_user_compat(child, addr, utmp); |
| } |
| if (ret) |
| return ret; |
| addr += sizeof(unsigned int); |
| data += sizeof(unsigned int); |
| copied += sizeof(unsigned int); |
| } |
| return 0; |
| case PTRACE_GET_LAST_BREAK: |
| put_user(task_thread_info(child)->last_break, |
| (unsigned int __user *) data); |
| return 0; |
| } |
| return compat_ptrace_request(child, request, addr, data); |
| } |
| #endif |
| |
| asmlinkage long do_syscall_trace_enter(struct pt_regs *regs) |
| { |
| long ret = 0; |
| |
| /* Do the secure computing check first. */ |
| secure_computing_strict(regs->gprs[2]); |
| |
| /* |
| * The sysc_tracesys code in entry.S stored the system |
| * call number to gprs[2]. |
| */ |
| if (test_thread_flag(TIF_SYSCALL_TRACE) && |
| (tracehook_report_syscall_entry(regs) || |
| regs->gprs[2] >= NR_syscalls)) { |
| /* |
| * Tracing decided this syscall should not happen or the |
| * debugger stored an invalid system call number. Skip |
| * the system call and the system call restart handling. |
| */ |
| clear_thread_flag(TIF_SYSCALL); |
| ret = -1; |
| } |
| |
| if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
| trace_sys_enter(regs, regs->gprs[2]); |
| |
| audit_syscall_entry(is_compat_task() ? |
| AUDIT_ARCH_S390 : AUDIT_ARCH_S390X, |
| regs->gprs[2], regs->orig_gpr2, |
| regs->gprs[3], regs->gprs[4], |
| regs->gprs[5]); |
| return ret ?: regs->gprs[2]; |
| } |
| |
| asmlinkage void do_syscall_trace_exit(struct pt_regs *regs) |
| { |
| audit_syscall_exit(regs); |
| |
| if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
| trace_sys_exit(regs, regs->gprs[2]); |
| |
| if (test_thread_flag(TIF_SYSCALL_TRACE)) |
| tracehook_report_syscall_exit(regs, 0); |
| } |
| |
| /* |
| * user_regset definitions. |
| */ |
| |
| static int s390_regs_get(struct task_struct *target, |
| const struct user_regset *regset, |
| unsigned int pos, unsigned int count, |
| void *kbuf, void __user *ubuf) |
| { |
| if (target == current) |
| save_access_regs(target->thread.acrs); |
| |
| if (kbuf) { |
| unsigned long *k = kbuf; |
| while (count > 0) { |
| *k++ = __peek_user(target, pos); |
| count -= sizeof(*k); |
| pos += sizeof(*k); |
| } |
| } else { |
| unsigned long __user *u = ubuf; |
| while (count > 0) { |
| if (__put_user(__peek_user(target, pos), u++)) |
| return -EFAULT; |
| count -= sizeof(*u); |
| pos += sizeof(*u); |
| } |
| } |
| return 0; |
| } |
| |
| static int s390_regs_set(struct task_struct *target, |
| const struct user_regset *regset, |
| unsigned int pos, unsigned int count, |
| const void *kbuf, const void __user *ubuf) |
| { |
| int rc = 0; |
| |
| if (target == current) |
| save_access_regs(target->thread.acrs); |
| |
| if (kbuf) { |
| const unsigned long *k = kbuf; |
| while (count > 0 && !rc) { |
| rc = __poke_user(target, pos, *k++); |
| count -= sizeof(*k); |
| pos += sizeof(*k); |
| } |
| } else { |
| const unsigned long __user *u = ubuf; |
| while (count > 0 && !rc) { |
| unsigned long word; |
| rc = __get_user(word, u++); |
| if (rc) |
| break; |
| rc = __poke_user(target, pos, word); |
| count -= sizeof(*u); |
| pos += sizeof(*u); |
| } |
| } |
| |
| if (rc == 0 && target == current) |
| restore_access_regs(target->thread.acrs); |
| |
| return rc; |
| } |
| |
| static int s390_fpregs_get(struct task_struct *target, |
| const struct user_regset *regset, unsigned int pos, |
| unsigned int count, void *kbuf, void __user *ubuf) |
| { |
| if (target == current) |
| save_fp_regs(&target->thread.fp_regs); |
| |
| return user_regset_copyout(&pos, &count, &kbuf, &ubuf, |
| &target->thread.fp_regs, 0, -1); |
| } |
| |
| static int s390_fpregs_set(struct task_struct *target, |
| const struct user_regset *regset, unsigned int pos, |
| unsigned int count, const void *kbuf, |
| const void __user *ubuf) |
| { |
| int rc = 0; |
| |
| if (target == current) |
| save_fp_regs(&target->thread.fp_regs); |
| |
| /* If setting FPC, must validate it first. */ |
| if (count > 0 && pos < offsetof(s390_fp_regs, fprs)) { |
| u32 fpc[2] = { target->thread.fp_regs.fpc, 0 }; |
| rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &fpc, |
| 0, offsetof(s390_fp_regs, fprs)); |
| if (rc) |
| return rc; |
| if ((fpc[0] & ~FPC_VALID_MASK) != 0 || fpc[1] != 0) |
| return -EINVAL; |
| target->thread.fp_regs.fpc = fpc[0]; |
| } |
| |
| if (rc == 0 && count > 0) |
| rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, |
| target->thread.fp_regs.fprs, |
| offsetof(s390_fp_regs, fprs), -1); |
| |
| if (rc == 0 && target == current) |
| restore_fp_regs(&target->thread.fp_regs); |
| |
| return rc; |
| } |
| |
| #ifdef CONFIG_64BIT |
| |
| static int s390_last_break_get(struct task_struct *target, |
| const struct user_regset *regset, |
| unsigned int pos, unsigned int count, |
| void *kbuf, void __user *ubuf) |
| { |
| if (count > 0) { |
| if (kbuf) { |
| unsigned long *k = kbuf; |
| *k = task_thread_info(target)->last_break; |
| } else { |
| unsigned long __user *u = ubuf; |
| if (__put_user(task_thread_info(target)->last_break, u)) |
| return -EFAULT; |
| } |
| } |
| return 0; |
| } |
| |
| static int s390_last_break_set(struct task_struct *target, |
| const struct user_regset *regset, |
| unsigned int pos, unsigned int count, |
| const void *kbuf, const void __user *ubuf) |
| { |
| return 0; |
| } |
| |
| #endif |
| |
| static int s390_system_call_get(struct task_struct *target, |
| const struct user_regset *regset, |
| unsigned int pos, unsigned int count, |
| void *kbuf, void __user *ubuf) |
| { |
| unsigned int *data = &task_thread_info(target)->system_call; |
| return user_regset_copyout(&pos, &count, &kbuf, &ubuf, |
| data, 0, sizeof(unsigned int)); |
| } |
| |
| static int s390_system_call_set(struct task_struct *target, |
| const struct user_regset *regset, |
| unsigned int pos, unsigned int count, |
| const void *kbuf, const void __user *ubuf) |
| { |
| unsigned int *data = &task_thread_info(target)->system_call; |
| return user_regset_copyin(&pos, &count, &kbuf, &ubuf, |
| data, 0, sizeof(unsigned int)); |
| } |
| |
| static const struct user_regset s390_regsets[] = { |
| [REGSET_GENERAL] = { |
| .core_note_type = NT_PRSTATUS, |
| .n = sizeof(s390_regs) / sizeof(long), |
| .size = sizeof(long), |
| .align = sizeof(long), |
| .get = s390_regs_get, |
| .set = s390_regs_set, |
| }, |
| [REGSET_FP] = { |
| .core_note_type = NT_PRFPREG, |
| .n = sizeof(s390_fp_regs) / sizeof(long), |
| .size = sizeof(long), |
| .align = sizeof(long), |
| .get = s390_fpregs_get, |
| .set = s390_fpregs_set, |
| }, |
| #ifdef CONFIG_64BIT |
| [REGSET_LAST_BREAK] = { |
| .core_note_type = NT_S390_LAST_BREAK, |
| .n = 1, |
| .size = sizeof(long), |
| .align = sizeof(long), |
| .get = s390_last_break_get, |
| .set = s390_last_break_set, |
| }, |
| #endif |
| [REGSET_SYSTEM_CALL] = { |
| .core_note_type = NT_S390_SYSTEM_CALL, |
| .n = 1, |
| .size = sizeof(unsigned int), |
| .align = sizeof(unsigned int), |
| .get = s390_system_call_get, |
| .set = s390_system_call_set, |
| }, |
| }; |
| |
| static const struct user_regset_view user_s390_view = { |
| .name = UTS_MACHINE, |
| .e_machine = EM_S390, |
| .regsets = s390_regsets, |
| .n = ARRAY_SIZE(s390_regsets) |
| }; |
| |
| #ifdef CONFIG_COMPAT |
| static int s390_compat_regs_get(struct task_struct *target, |
| const struct user_regset *regset, |
| unsigned int pos, unsigned int count, |
| void *kbuf, void __user *ubuf) |
| { |
| if (target == current) |
| save_access_regs(target->thread.acrs); |
| |
| if (kbuf) { |
| compat_ulong_t *k = kbuf; |
| while (count > 0) { |
| *k++ = __peek_user_compat(target, pos); |
| count -= sizeof(*k); |
| pos += sizeof(*k); |
| } |
| } else { |
| compat_ulong_t __user *u = ubuf; |
| while (count > 0) { |
| if (__put_user(__peek_user_compat(target, pos), u++)) |
| return -EFAULT; |
| count -= sizeof(*u); |
| pos += sizeof(*u); |
| } |
| } |
| return 0; |
| } |
| |
| static int s390_compat_regs_set(struct task_struct *target, |
| const struct user_regset *regset, |
| unsigned int pos, unsigned int count, |
| const void *kbuf, const void __user *ubuf) |
| { |
| int rc = 0; |
| |
| if (target == current) |
| save_access_regs(target->thread.acrs); |
| |
| if (kbuf) { |
| const compat_ulong_t *k = kbuf; |
| while (count > 0 && !rc) { |
| rc = __poke_user_compat(target, pos, *k++); |
| count -= sizeof(*k); |
| pos += sizeof(*k); |
| } |
| } else { |
| const compat_ulong_t __user *u = ubuf; |
| while (count > 0 && !rc) { |
| compat_ulong_t word; |
| rc = __get_user(word, u++); |
| if (rc) |
| break; |
| rc = __poke_user_compat(target, pos, word); |
| count -= sizeof(*u); |
| pos += sizeof(*u); |
| } |
| } |
| |
| if (rc == 0 && target == current) |
| restore_access_regs(target->thread.acrs); |
| |
| return rc; |
| } |
| |
| static int s390_compat_regs_high_get(struct task_struct *target, |
| const struct user_regset *regset, |
| unsigned int pos, unsigned int count, |
| void *kbuf, void __user *ubuf) |
| { |
| compat_ulong_t *gprs_high; |
| |
| gprs_high = (compat_ulong_t *) |
| &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)]; |
| if (kbuf) { |
| compat_ulong_t *k = kbuf; |
| while (count > 0) { |
| *k++ = *gprs_high; |
| gprs_high += 2; |
| count -= sizeof(*k); |
| } |
| } else { |
| compat_ulong_t __user *u = ubuf; |
| while (count > 0) { |
| if (__put_user(*gprs_high, u++)) |
| return -EFAULT; |
| gprs_high += 2; |
| count -= sizeof(*u); |
| } |
| } |
| return 0; |
| } |
| |
| static int s390_compat_regs_high_set(struct task_struct *target, |
| const struct user_regset *regset, |
| unsigned int pos, unsigned int count, |
| const void *kbuf, const void __user *ubuf) |
| { |
| compat_ulong_t *gprs_high; |
| int rc = 0; |
| |
| gprs_high = (compat_ulong_t *) |
| &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)]; |
| if (kbuf) { |
| const compat_ulong_t *k = kbuf; |
| while (count > 0) { |
| *gprs_high = *k++; |
| *gprs_high += 2; |
| count -= sizeof(*k); |
| } |
| } else { |
| const compat_ulong_t __user *u = ubuf; |
| while (count > 0 && !rc) { |
| unsigned long word; |
| rc = __get_user(word, u++); |
| if (rc) |
| break; |
| *gprs_high = word; |
| *gprs_high += 2; |
| count -= sizeof(*u); |
| } |
| } |
| |
| return rc; |
| } |
| |
| static int s390_compat_last_break_get(struct task_struct *target, |
| const struct user_regset *regset, |
| unsigned int pos, unsigned int count, |
| void *kbuf, void __user *ubuf) |
| { |
| compat_ulong_t last_break; |
| |
| if (count > 0) { |
| last_break = task_thread_info(target)->last_break; |
| if (kbuf) { |
| unsigned long *k = kbuf; |
| *k = last_break; |
| } else { |
| unsigned long __user *u = ubuf; |
| if (__put_user(last_break, u)) |
| return -EFAULT; |
| } |
| } |
| return 0; |
| } |
| |
| static int s390_compat_last_break_set(struct task_struct *target, |
| const struct user_regset *regset, |
| unsigned int pos, unsigned int count, |
| const void *kbuf, const void __user *ubuf) |
| { |
| return 0; |
| } |
| |
| static const struct user_regset s390_compat_regsets[] = { |
| [REGSET_GENERAL] = { |
| .core_note_type = NT_PRSTATUS, |
| .n = sizeof(s390_compat_regs) / sizeof(compat_long_t), |
| .size = sizeof(compat_long_t), |
| .align = sizeof(compat_long_t), |
| .get = s390_compat_regs_get, |
| .set = s390_compat_regs_set, |
| }, |
| [REGSET_FP] = { |
| .core_note_type = NT_PRFPREG, |
| .n = sizeof(s390_fp_regs) / sizeof(compat_long_t), |
| .size = sizeof(compat_long_t), |
| .align = sizeof(compat_long_t), |
| .get = s390_fpregs_get, |
| .set = s390_fpregs_set, |
| }, |
| [REGSET_LAST_BREAK] = { |
| .core_note_type = NT_S390_LAST_BREAK, |
| .n = 1, |
| .size = sizeof(long), |
| .align = sizeof(long), |
| .get = s390_compat_last_break_get, |
| .set = s390_compat_last_break_set, |
| }, |
| [REGSET_SYSTEM_CALL] = { |
| .core_note_type = NT_S390_SYSTEM_CALL, |
| .n = 1, |
| .size = sizeof(compat_uint_t), |
| .align = sizeof(compat_uint_t), |
| .get = s390_system_call_get, |
| .set = s390_system_call_set, |
| }, |
| [REGSET_GENERAL_EXTENDED] = { |
| .core_note_type = NT_S390_HIGH_GPRS, |
| .n = sizeof(s390_compat_regs_high) / sizeof(compat_long_t), |
| .size = sizeof(compat_long_t), |
| .align = sizeof(compat_long_t), |
| .get = s390_compat_regs_high_get, |
| .set = s390_compat_regs_high_set, |
| }, |
| }; |
| |
| static const struct user_regset_view user_s390_compat_view = { |
| .name = "s390", |
| .e_machine = EM_S390, |
| .regsets = s390_compat_regsets, |
| .n = ARRAY_SIZE(s390_compat_regsets) |
| }; |
| #endif |
| |
| const struct user_regset_view *task_user_regset_view(struct task_struct *task) |
| { |
| #ifdef CONFIG_COMPAT |
| if (test_tsk_thread_flag(task, TIF_31BIT)) |
| return &user_s390_compat_view; |
| #endif |
| return &user_s390_view; |
| } |
| |
| static const char *gpr_names[NUM_GPRS] = { |
| "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", |
| "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", |
| }; |
| |
| unsigned long regs_get_register(struct pt_regs *regs, unsigned int offset) |
| { |
| if (offset >= NUM_GPRS) |
| return 0; |
| return regs->gprs[offset]; |
| } |
| |
| int regs_query_register_offset(const char *name) |
| { |
| unsigned long offset; |
| |
| if (!name || *name != 'r') |
| return -EINVAL; |
| if (strict_strtoul(name + 1, 10, &offset)) |
| return -EINVAL; |
| if (offset >= NUM_GPRS) |
| return -EINVAL; |
| return offset; |
| } |
| |
| const char *regs_query_register_name(unsigned int offset) |
| { |
| if (offset >= NUM_GPRS) |
| return NULL; |
| return gpr_names[offset]; |
| } |
| |
| static int regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr) |
| { |
| unsigned long ksp = kernel_stack_pointer(regs); |
| |
| return (addr & ~(THREAD_SIZE - 1)) == (ksp & ~(THREAD_SIZE - 1)); |
| } |
| |
| /** |
| * regs_get_kernel_stack_nth() - get Nth entry of the stack |
| * @regs:pt_regs which contains kernel stack pointer. |
| * @n:stack entry number. |
| * |
| * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which |
| * is specifined by @regs. If the @n th entry is NOT in the kernel stack, |
| * this returns 0. |
| */ |
| unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n) |
| { |
| unsigned long addr; |
| |
| addr = kernel_stack_pointer(regs) + n * sizeof(long); |
| if (!regs_within_kernel_stack(regs, addr)) |
| return 0; |
| return *(unsigned long *)addr; |
| } |