/* * arch/s390/kernel/ptrace.c * * S390 version * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation * Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com), * Martin Schwidefsky (schwidefsky@de.ibm.com) * * Based on PowerPC version * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) * * Derived from "arch/m68k/kernel/ptrace.c" * Copyright (C) 1994 by Hamish Macdonald * Taken from linux/kernel/ptrace.c and modified for M680x0. * linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds * * Modified by Cort Dougan (cort@cs.nmt.edu) * * * This file is subject to the terms and conditions of the GNU General * Public License. See the file README.legal in the main directory of * this archive for more details. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "entry.h" #ifdef CONFIG_COMPAT #include "compat_ptrace.h" #endif DEFINE_TRACE(syscall_enter); DEFINE_TRACE(syscall_exit); enum s390_regset { REGSET_GENERAL, REGSET_FP, }; static void FixPerRegisters(struct task_struct *task) { struct pt_regs *regs; per_struct *per_info; regs = task_pt_regs(task); per_info = (per_struct *) &task->thread.per_info; per_info->control_regs.bits.em_instruction_fetch = per_info->single_step | per_info->instruction_fetch; if (per_info->single_step) { per_info->control_regs.bits.starting_addr = 0; #ifdef CONFIG_COMPAT if (is_compat_task()) per_info->control_regs.bits.ending_addr = 0x7fffffffUL; else #endif per_info->control_regs.bits.ending_addr = PSW_ADDR_INSN; } else { per_info->control_regs.bits.starting_addr = per_info->starting_addr; per_info->control_regs.bits.ending_addr = per_info->ending_addr; } /* * if any of the control reg tracing bits are on * we switch on per in the psw */ if (per_info->control_regs.words.cr[0] & PER_EM_MASK) regs->psw.mask |= PSW_MASK_PER; else regs->psw.mask &= ~PSW_MASK_PER; if (per_info->control_regs.bits.em_storage_alteration) per_info->control_regs.bits.storage_alt_space_ctl = 1; else per_info->control_regs.bits.storage_alt_space_ctl = 0; } void user_enable_single_step(struct task_struct *task) { task->thread.per_info.single_step = 1; FixPerRegisters(task); } void user_disable_single_step(struct task_struct *task) { task->thread.per_info.single_step = 0; FixPerRegisters(task); } /* * Called by kernel/ptrace.c when detaching.. * * Make sure single step bits etc are not set. */ void ptrace_disable(struct task_struct *child) { /* make sure the single step bit is not set. */ user_disable_single_step(child); } #ifndef CONFIG_64BIT # define __ADDR_MASK 3 #else # define __ADDR_MASK 7 #endif /* * 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) /* Remove per bit from user psw. */ tmp &= ~PSW_MASK_PER; } 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)) { /* * per_info is found in the thread structure */ offset = addr - (addr_t) &dummy->regs.per_info; tmp = *(addr_t *)((addr_t) &child->thread.per_info + offset); } 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); } /* * 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 && #ifdef CONFIG_COMPAT data != PSW_MASK_MERGE(psw_user32_bits, data) && #endif data != PSW_MASK_MERGE(psw_user_bits, data)) /* Invalid psw mask. */ return -EINVAL; #ifndef CONFIG_64BIT if (addr == (addr_t) &dummy->regs.psw.addr) /* I'd like to reject addresses without the high order bit but older gdb's rely on it */ data |= PSW_ADDR_AMODE; #endif *(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)) { /* * per_info is found in the thread structure */ offset = addr - (addr_t) &dummy->regs.per_info; *(addr_t *)((addr_t) &child->thread.per_info + offset) = data; } FixPerRegisters(child); 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, long addr, long data) { ptrace_area parea; int copied, ret; switch (request) { case PTRACE_PEEKTEXT: case PTRACE_PEEKDATA: /* Remove high order bit from address (only for 31 bit). */ addr &= PSW_ADDR_INSN; /* read word at location addr. */ return generic_ptrace_peekdata(child, addr, data); case PTRACE_PEEKUSR: /* read the word at location addr in the USER area. */ return peek_user(child, addr, data); case PTRACE_POKETEXT: case PTRACE_POKEDATA: /* Remove high order bit from address (only for 31 bit). */ addr &= PSW_ADDR_INSN; /* write the word at location addr. */ return generic_ptrace_pokedata(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; } 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 but for a 31 bit program. */ static u32 __peek_user_compat(struct task_struct *child, addr_t addr) { struct user32 *dummy32 = NULL; per_struct32 *dummy_per32 = NULL; addr_t offset; __u32 tmp; if (addr < (addr_t) &dummy32->regs.acrs) { /* * psw and gprs are stored on the stack */ if (addr == (addr_t) &dummy32->regs.psw.mask) { /* Fake a 31 bit psw mask. */ tmp = (__u32)(task_pt_regs(child)->psw.mask >> 32); tmp = PSW32_MASK_MERGE(psw32_user_bits, tmp); } else if (addr == (addr_t) &dummy32->regs.psw.addr) { /* Fake a 31 bit psw address. */ tmp = (__u32) task_pt_regs(child)->psw.addr | PSW32_ADDR_AMODE31; } else { /* gpr 0-15 */ tmp = *(__u32 *)((addr_t) &task_pt_regs(child)->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)) { /* * per_info is found in the thread structure */ offset = addr - (addr_t) &dummy32->regs.per_info; /* This is magic. See per_struct and per_struct32. */ if ((offset >= (addr_t) &dummy_per32->control_regs && offset < (addr_t) (&dummy_per32->control_regs + 1)) || (offset >= (addr_t) &dummy_per32->starting_addr && offset <= (addr_t) &dummy_per32->ending_addr) || offset == (addr_t) &dummy_per32->lowcore.words.address) offset = offset*2 + 4; else offset = offset*2; tmp = *(__u32 *)((addr_t) &child->thread.per_info + offset); } 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 but for a 31 bit program. */ static int __poke_user_compat(struct task_struct *child, addr_t addr, addr_t data) { struct user32 *dummy32 = NULL; per_struct32 *dummy_per32 = NULL; __u32 tmp = (__u32) data; addr_t offset; if (addr < (addr_t) &dummy32->regs.acrs) { /* * 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_MERGE(psw32_user_bits, tmp)) /* Invalid psw mask. */ return -EINVAL; task_pt_regs(child)->psw.mask = PSW_MASK_MERGE(psw_user32_bits, (__u64) tmp << 32); } else if (addr == (addr_t) &dummy32->regs.psw.addr) { /* Build a 64 bit psw address from 31 bit address. */ task_pt_regs(child)->psw.addr = (__u64) tmp & PSW32_ADDR_INSN; } else { /* gpr 0-15 */ *(__u32*)((addr_t) &task_pt_regs(child)->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)) { /* * per_info is found in the thread structure. */ offset = addr - (addr_t) &dummy32->regs.per_info; /* * This is magic. See per_struct and per_struct32. * By incident the offsets in per_struct are exactly * twice the offsets in per_struct32 for all fields. * The 8 byte fields need special handling though, * because the second half (bytes 4-7) is needed and * not the first half. */ if ((offset >= (addr_t) &dummy_per32->control_regs && offset < (addr_t) (&dummy_per32->control_regs + 1)) || (offset >= (addr_t) &dummy_per32->starting_addr && offset <= (addr_t) &dummy_per32->ending_addr) || offset == (addr_t) &dummy_per32->lowcore.words.address) offset = offset*2 + 4; else offset = offset*2; *(__u32 *)((addr_t) &child->thread.per_info + offset) = tmp; } FixPerRegisters(child); 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 user32) - 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; ptrace_area_emu31 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; } return compat_ptrace_request(child, request, addr, data); } #endif asmlinkage long do_syscall_trace_enter(struct pt_regs *regs) { long ret; /* Do the secure computing check first. */ secure_computing(regs->gprs[2]); /* * The sysc_tracesys code in entry.S stored the system * call number to gprs[2]. */ ret = regs->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. */ regs->svcnr = 0; ret = -1; } if (unlikely(test_thread_flag(TIF_SYSCALL_FTRACE))) trace_syscall_enter(regs, regs->gprs[2]); if (unlikely(current->audit_context)) 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; } asmlinkage void do_syscall_trace_exit(struct pt_regs *regs) { if (unlikely(current->audit_context)) audit_syscall_exit(AUDITSC_RESULT(regs->gprs[2]), regs->gprs[2]); if (unlikely(test_thread_flag(TIF_SYSCALL_FTRACE))) trace_syscall_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; } 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, }, }; 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 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, }, }; 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; }