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Diffstat (limited to 'arch/s390/kernel/ptrace.c')
| -rw-r--r-- | arch/s390/kernel/ptrace.c | 1776 |
1 files changed, 1776 insertions, 0 deletions
diff --git a/arch/s390/kernel/ptrace.c b/arch/s390/kernel/ptrace.c new file mode 100644 index 000000000..3ffa2847c --- /dev/null +++ b/arch/s390/kernel/ptrace.c @@ -0,0 +1,1776 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * 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/sched/task_stack.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 <linux/uaccess.h> +#include <asm/unistd.h> +#include <asm/switch_to.h> +#include <asm/runtime_instr.h> +#include <asm/facility.h> + +#include "entry.h" + +#ifdef CONFIG_COMPAT +#include "compat_ptrace.h" +#endif + +#define CREATE_TRACE_POINTS +#include <trace/events/syscalls.h> + +void update_cr_regs(struct task_struct *task) +{ + struct pt_regs *regs = task_pt_regs(task); + struct thread_struct *thread = &task->thread; + struct per_regs old, new; + union ctlreg0 cr0_old, cr0_new; + union ctlreg2 cr2_old, cr2_new; + int cr0_changed, cr2_changed; + + __ctl_store(cr0_old.val, 0, 0); + __ctl_store(cr2_old.val, 2, 2); + cr0_new = cr0_old; + cr2_new = cr2_old; + /* Take care of the enable/disable of transactional execution. */ + if (MACHINE_HAS_TE) { + /* Set or clear transaction execution TXC bit 8. */ + cr0_new.tcx = 1; + if (task->thread.per_flags & PER_FLAG_NO_TE) + cr0_new.tcx = 0; + /* Set or clear transaction execution TDC bits 62 and 63. */ + cr2_new.tdc = 0; + if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND) { + if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND_TEND) + cr2_new.tdc = 1; + else + cr2_new.tdc = 2; + } + } + /* Take care of enable/disable of guarded storage. */ + if (MACHINE_HAS_GS) { + cr2_new.gse = 0; + if (task->thread.gs_cb) + cr2_new.gse = 1; + } + /* Load control register 0/2 iff changed */ + cr0_changed = cr0_new.val != cr0_old.val; + cr2_changed = cr2_new.val != cr2_old.val; + if (cr0_changed) + __ctl_load(cr0_new.val, 0, 0); + if (cr2_changed) + __ctl_load(cr2_new.val, 2, 2); + /* 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) || + test_tsk_thread_flag(task, TIF_UPROBE_SINGLESTEP)) { + if (test_tsk_thread_flag(task, TIF_BLOCK_STEP)) + new.control |= PER_EVENT_BRANCH; + else + new.control |= PER_EVENT_IFETCH; + new.control |= PER_CONTROL_SUSPENSION; + new.control |= PER_EVENT_TRANSACTION_END; + if (test_tsk_thread_flag(task, TIF_UPROBE_SINGLESTEP)) + new.control |= PER_EVENT_IFETCH; + new.start = 0; + new.end = -1UL; + } + + /* 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) +{ + clear_tsk_thread_flag(task, TIF_BLOCK_STEP); + set_tsk_thread_flag(task, TIF_SINGLE_STEP); +} + +void user_disable_single_step(struct task_struct *task) +{ + clear_tsk_thread_flag(task, TIF_BLOCK_STEP); + clear_tsk_thread_flag(task, TIF_SINGLE_STEP); +} + +void user_enable_block_step(struct task_struct *task) +{ + set_tsk_thread_flag(task, TIF_SINGLE_STEP); + set_tsk_thread_flag(task, TIF_BLOCK_STEP); +} + +/* + * 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_pt_regs_flag(task_pt_regs(task), PIF_PER_TRAP); + task->thread.per_flags = 0; +} + +#define __ADDR_MASK 7 + +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) ? + -1UL : 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_MASK_USER | PSW_MASK_RI; + tmp |= PSW_USER_BITS; + } + + } else if (addr < (addr_t) &dummy->regs.orig_gpr2) { + /* + * access registers are stored in the thread structure + */ + offset = addr - (addr_t) &dummy->regs.acrs; + /* + * 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 + 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.fpc) { + /* + * floating point control reg. is in the thread structure + */ + tmp = child->thread.fpu.fpc; + tmp <<= BITS_PER_LONG - 32; + + } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) { + /* + * floating point regs. are either in child->thread.fpu + * or the child->thread.fpu.vxrs array + */ + offset = addr - (addr_t) &dummy->regs.fp_regs.fprs; + if (MACHINE_HAS_VX) + tmp = *(addr_t *) + ((addr_t) child->thread.fpu.vxrs + 2*offset); + else + tmp = *(addr_t *) + ((addr_t) child->thread.fpu.fprs + offset); + + } 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; + if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs && + addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2) + mask = 3; + 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; +} + +static void fixup_int_code(struct task_struct *child, addr_t data) +{ + struct pt_regs *regs = task_pt_regs(child); + int ilc = regs->int_code >> 16; + u16 insn; + + if (ilc > 6) + return; + + if (ptrace_access_vm(child, regs->psw.addr - (regs->int_code >> 16), + &insn, sizeof(insn), FOLL_FORCE) != sizeof(insn)) + return; + + /* double check that tracee stopped on svc instruction */ + if ((insn >> 8) != 0xa) + return; + + regs->int_code = 0x20000 | (data & 0xffff); +} +/* + * 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) { + struct pt_regs *regs = task_pt_regs(child); + /* + * psw and gprs are stored on the stack + */ + if (addr == (addr_t) &dummy->regs.psw.mask) { + unsigned long mask = PSW_MASK_USER; + + mask |= is_ri_task(child) ? PSW_MASK_RI : 0; + if ((data ^ PSW_USER_BITS) & ~mask) + /* Invalid psw mask. */ + return -EINVAL; + if ((data & PSW_MASK_ASC) == PSW_ASC_HOME) + /* Invalid address-space-control bits */ + return -EINVAL; + if ((data & PSW_MASK_EA) && !(data & PSW_MASK_BA)) + /* Invalid addressing mode bits */ + return -EINVAL; + } + + if (test_pt_regs_flag(regs, PIF_SYSCALL) && + addr == offsetof(struct user, regs.gprs[2])) + fixup_int_code(child, data); + *(addr_t *)((addr_t) ®s->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; + /* + * 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 + *(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.fpc) { + /* + * floating point control reg. is in the thread structure + */ + if ((unsigned int) data != 0 || + test_fp_ctl(data >> (BITS_PER_LONG - 32))) + return -EINVAL; + child->thread.fpu.fpc = data >> (BITS_PER_LONG - 32); + + } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) { + /* + * floating point regs. are either in child->thread.fpu + * or the child->thread.fpu.vxrs array + */ + offset = addr - (addr_t) &dummy->regs.fp_regs.fprs; + if (MACHINE_HAS_VX) + *(addr_t *)((addr_t) + child->thread.fpu.vxrs + 2*offset) = data; + else + *(addr_t *)((addr_t) + child->thread.fpu.fprs + 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; + if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs && + addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2) + mask = 3; + 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(child->thread.last_break, + (unsigned long __user *) data); + return 0; + case PTRACE_ENABLE_TE: + if (!MACHINE_HAS_TE) + return -EIO; + child->thread.per_flags &= ~PER_FLAG_NO_TE; + return 0; + case PTRACE_DISABLE_TE: + 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: + 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_MASK_USER | PSW32_MASK_RI; + tmp |= PSW32_USER_BITS; + } 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.fpc) { + /* + * floating point control reg. is in the thread structure + */ + tmp = child->thread.fpu.fpc; + + } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) { + /* + * floating point regs. are either in child->thread.fpu + * or the child->thread.fpu.vxrs array + */ + offset = addr - (addr_t) &dummy32->regs.fp_regs.fprs; + if (MACHINE_HAS_VX) + tmp = *(__u32 *) + ((addr_t) child->thread.fpu.vxrs + 2*offset); + else + tmp = *(__u32 *) + ((addr_t) child->thread.fpu.fprs + 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) { + __u32 mask = PSW32_MASK_USER; + + mask |= is_ri_task(child) ? PSW32_MASK_RI : 0; + /* Build a 64 bit psw mask from 31 bit mask. */ + if ((tmp ^ PSW32_USER_BITS) & ~mask) + /* Invalid psw mask. */ + return -EINVAL; + if ((data & PSW32_MASK_ASC) == PSW32_ASC_HOME) + /* Invalid address-space-control bits */ + return -EINVAL; + regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) | + (regs->psw.mask & PSW_MASK_BA) | + (__u64)(tmp & mask) << 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 { + + if (test_pt_regs_flag(regs, PIF_SYSCALL) && + addr == offsetof(struct compat_user, regs.gprs[2])) + fixup_int_code(child, data); + /* 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.fpc) { + /* + * floating point control reg. is in the thread structure + */ + if (test_fp_ctl(tmp)) + return -EINVAL; + child->thread.fpu.fpc = data; + + } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) { + /* + * floating point regs. are either in child->thread.fpu + * or the child->thread.fpu.vxrs array + */ + offset = addr - (addr_t) &dummy32->regs.fp_regs.fprs; + if (MACHINE_HAS_VX) + *(__u32 *)((addr_t) + child->thread.fpu.vxrs + 2*offset) = tmp; + else + *(__u32 *)((addr_t) + child->thread.fpu.fprs + 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(child->thread.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) +{ + unsigned long mask = -1UL; + + /* + * 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_pt_regs_flag(regs, PIF_SYSCALL); + return -1; + } + + /* Do the secure computing check after ptrace. */ + if (secure_computing(NULL)) { + /* seccomp failures shouldn't expose any additional code. */ + return -1; + } + + if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) + trace_sys_enter(regs, regs->gprs[2]); + + if (is_compat_task()) + mask = 0xffffffff; + + audit_syscall_entry(regs->gprs[2], regs->orig_gpr2 & mask, + regs->gprs[3] &mask, regs->gprs[4] &mask, + regs->gprs[5] &mask); + + return 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) +{ + _s390_fp_regs fp_regs; + + if (target == current) + save_fpu_regs(); + + fp_regs.fpc = target->thread.fpu.fpc; + fpregs_store(&fp_regs, &target->thread.fpu); + + return user_regset_copyout(&pos, &count, &kbuf, &ubuf, + &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; + freg_t fprs[__NUM_FPRS]; + + if (target == current) + save_fpu_regs(); + + if (MACHINE_HAS_VX) + convert_vx_to_fp(fprs, target->thread.fpu.vxrs); + else + memcpy(&fprs, target->thread.fpu.fprs, sizeof(fprs)); + + /* If setting FPC, must validate it first. */ + if (count > 0 && pos < offsetof(s390_fp_regs, fprs)) { + u32 ufpc[2] = { target->thread.fpu.fpc, 0 }; + rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &ufpc, + 0, offsetof(s390_fp_regs, fprs)); + if (rc) + return rc; + if (ufpc[1] != 0 || test_fp_ctl(ufpc[0])) + return -EINVAL; + target->thread.fpu.fpc = ufpc[0]; + } + + if (rc == 0 && count > 0) + rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, + fprs, offsetof(s390_fp_regs, fprs), -1); + if (rc) + return rc; + + if (MACHINE_HAS_VX) + convert_fp_to_vx(target->thread.fpu.vxrs, fprs); + else + memcpy(target->thread.fpu.fprs, &fprs, sizeof(fprs)); + + return rc; +} + +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 = target->thread.last_break; + } else { + unsigned long __user *u = ubuf; + if (__put_user(target->thread.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; +} + +static int s390_tdb_get(struct task_struct *target, + const struct user_regset *regset, + unsigned int pos, unsigned int count, + void *kbuf, void __user *ubuf) +{ + struct pt_regs *regs = task_pt_regs(target); + unsigned char *data; + + if (!(regs->int_code & 0x200)) + return -ENODATA; + data = target->thread.trap_tdb; + return user_regset_copyout(&pos, &count, &kbuf, &ubuf, data, 0, 256); +} + +static int s390_tdb_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 int s390_vxrs_low_get(struct task_struct *target, + const struct user_regset *regset, + unsigned int pos, unsigned int count, + void *kbuf, void __user *ubuf) +{ + __u64 vxrs[__NUM_VXRS_LOW]; + int i; + + if (!MACHINE_HAS_VX) + return -ENODEV; + if (target == current) + save_fpu_regs(); + for (i = 0; i < __NUM_VXRS_LOW; i++) + vxrs[i] = *((__u64 *)(target->thread.fpu.vxrs + i) + 1); + return user_regset_copyout(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1); +} + +static int s390_vxrs_low_set(struct task_struct *target, + const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf) +{ + __u64 vxrs[__NUM_VXRS_LOW]; + int i, rc; + + if (!MACHINE_HAS_VX) + return -ENODEV; + if (target == current) + save_fpu_regs(); + + for (i = 0; i < __NUM_VXRS_LOW; i++) + vxrs[i] = *((__u64 *)(target->thread.fpu.vxrs + i) + 1); + + rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1); + if (rc == 0) + for (i = 0; i < __NUM_VXRS_LOW; i++) + *((__u64 *)(target->thread.fpu.vxrs + i) + 1) = vxrs[i]; + + return rc; +} + +static int s390_vxrs_high_get(struct task_struct *target, + const struct user_regset *regset, + unsigned int pos, unsigned int count, + void *kbuf, void __user *ubuf) +{ + __vector128 vxrs[__NUM_VXRS_HIGH]; + + if (!MACHINE_HAS_VX) + return -ENODEV; + if (target == current) + save_fpu_regs(); + memcpy(vxrs, target->thread.fpu.vxrs + __NUM_VXRS_LOW, sizeof(vxrs)); + + return user_regset_copyout(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1); +} + +static int s390_vxrs_high_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; + + if (!MACHINE_HAS_VX) + return -ENODEV; + if (target == current) + save_fpu_regs(); + + rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, + target->thread.fpu.vxrs + __NUM_VXRS_LOW, 0, -1); + return rc; +} + +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 = &target->thread.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 = &target->thread.system_call; + return user_regset_copyin(&pos, &count, &kbuf, &ubuf, + data, 0, sizeof(unsigned int)); +} + +static int s390_gs_cb_get(struct task_struct *target, + const struct user_regset *regset, + unsigned int pos, unsigned int count, + void *kbuf, void __user *ubuf) +{ + struct gs_cb *data = target->thread.gs_cb; + + if (!MACHINE_HAS_GS) + return -ENODEV; + if (!data) + return -ENODATA; + if (target == current) + save_gs_cb(data); + return user_regset_copyout(&pos, &count, &kbuf, &ubuf, + data, 0, sizeof(struct gs_cb)); +} + +static int s390_gs_cb_set(struct task_struct *target, + const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf) +{ + struct gs_cb gs_cb = { }, *data = NULL; + int rc; + + if (!MACHINE_HAS_GS) + return -ENODEV; + if (!target->thread.gs_cb) { + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + } + if (!target->thread.gs_cb) + gs_cb.gsd = 25; + else if (target == current) + save_gs_cb(&gs_cb); + else + gs_cb = *target->thread.gs_cb; + rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, + &gs_cb, 0, sizeof(gs_cb)); + if (rc) { + kfree(data); + return -EFAULT; + } + preempt_disable(); + if (!target->thread.gs_cb) + target->thread.gs_cb = data; + *target->thread.gs_cb = gs_cb; + if (target == current) { + __ctl_set_bit(2, 4); + restore_gs_cb(target->thread.gs_cb); + } + preempt_enable(); + return rc; +} + +static int s390_gs_bc_get(struct task_struct *target, + const struct user_regset *regset, + unsigned int pos, unsigned int count, + void *kbuf, void __user *ubuf) +{ + struct gs_cb *data = target->thread.gs_bc_cb; + + if (!MACHINE_HAS_GS) + return -ENODEV; + if (!data) + return -ENODATA; + return user_regset_copyout(&pos, &count, &kbuf, &ubuf, + data, 0, sizeof(struct gs_cb)); +} + +static int s390_gs_bc_set(struct task_struct *target, + const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf) +{ + struct gs_cb *data = target->thread.gs_bc_cb; + + if (!MACHINE_HAS_GS) + return -ENODEV; + if (!data) { + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + target->thread.gs_bc_cb = data; + } + return user_regset_copyin(&pos, &count, &kbuf, &ubuf, + data, 0, sizeof(struct gs_cb)); +} + +static bool is_ri_cb_valid(struct runtime_instr_cb *cb) +{ + return (cb->rca & 0x1f) == 0 && + (cb->roa & 0xfff) == 0 && + (cb->rla & 0xfff) == 0xfff && + cb->s == 1 && + cb->k == 1 && + cb->h == 0 && + cb->reserved1 == 0 && + cb->ps == 1 && + cb->qs == 0 && + cb->pc == 1 && + cb->qc == 0 && + cb->reserved2 == 0 && + cb->reserved3 == 0 && + cb->reserved4 == 0 && + cb->reserved5 == 0 && + cb->reserved6 == 0 && + cb->reserved7 == 0 && + cb->reserved8 == 0 && + cb->rla >= cb->roa && + cb->rca >= cb->roa && + cb->rca <= cb->rla+1 && + cb->m < 3; +} + +static int s390_runtime_instr_get(struct task_struct *target, + const struct user_regset *regset, + unsigned int pos, unsigned int count, + void *kbuf, void __user *ubuf) +{ + struct runtime_instr_cb *data = target->thread.ri_cb; + + if (!test_facility(64)) + return -ENODEV; + if (!data) + return -ENODATA; + + return user_regset_copyout(&pos, &count, &kbuf, &ubuf, + data, 0, sizeof(struct runtime_instr_cb)); +} + +static int s390_runtime_instr_set(struct task_struct *target, + const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf) +{ + struct runtime_instr_cb ri_cb = { }, *data = NULL; + int rc; + + if (!test_facility(64)) + return -ENODEV; + + if (!target->thread.ri_cb) { + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + } + + if (target->thread.ri_cb) { + if (target == current) + store_runtime_instr_cb(&ri_cb); + else + ri_cb = *target->thread.ri_cb; + } + + rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, + &ri_cb, 0, sizeof(struct runtime_instr_cb)); + if (rc) { + kfree(data); + return -EFAULT; + } + + if (!is_ri_cb_valid(&ri_cb)) { + kfree(data); + return -EINVAL; + } + /* + * Override access key in any case, since user space should + * not be able to set it, nor should it care about it. + */ + ri_cb.key = PAGE_DEFAULT_KEY >> 4; + preempt_disable(); + if (!target->thread.ri_cb) + target->thread.ri_cb = data; + *target->thread.ri_cb = ri_cb; + if (target == current) + load_runtime_instr_cb(target->thread.ri_cb); + preempt_enable(); + + return 0; +} + +static const struct user_regset s390_regsets[] = { + { + .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, + }, + { + .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, + }, + { + .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, + }, + { + .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, + }, + { + .core_note_type = NT_S390_TDB, + .n = 1, + .size = 256, + .align = 1, + .get = s390_tdb_get, + .set = s390_tdb_set, + }, + { + .core_note_type = NT_S390_VXRS_LOW, + .n = __NUM_VXRS_LOW, + .size = sizeof(__u64), + .align = sizeof(__u64), + .get = s390_vxrs_low_get, + .set = s390_vxrs_low_set, + }, + { + .core_note_type = NT_S390_VXRS_HIGH, + .n = __NUM_VXRS_HIGH, + .size = sizeof(__vector128), + .align = sizeof(__vector128), + .get = s390_vxrs_high_get, + .set = s390_vxrs_high_set, + }, + { + .core_note_type = NT_S390_GS_CB, + .n = sizeof(struct gs_cb) / sizeof(__u64), + .size = sizeof(__u64), + .align = sizeof(__u64), + .get = s390_gs_cb_get, + .set = s390_gs_cb_set, + }, + { + .core_note_type = NT_S390_GS_BC, + .n = sizeof(struct gs_cb) / sizeof(__u64), + .size = sizeof(__u64), + .align = sizeof(__u64), + .get = s390_gs_bc_get, + .set = s390_gs_bc_set, + }, + { + .core_note_type = NT_S390_RI_CB, + .n = sizeof(struct runtime_instr_cb) / sizeof(__u64), + .size = sizeof(__u64), + .align = sizeof(__u64), + .get = s390_runtime_instr_get, + .set = s390_runtime_instr_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 = target->thread.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[] = { + { + .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, + }, + { + .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, + }, + { + .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, + }, + { + .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, + }, + { + .core_note_type = NT_S390_TDB, + .n = 1, + .size = 256, + .align = 1, + .get = s390_tdb_get, + .set = s390_tdb_set, + }, + { + .core_note_type = NT_S390_VXRS_LOW, + .n = __NUM_VXRS_LOW, + .size = sizeof(__u64), + .align = sizeof(__u64), + .get = s390_vxrs_low_get, + .set = s390_vxrs_low_set, + }, + { + .core_note_type = NT_S390_VXRS_HIGH, + .n = __NUM_VXRS_HIGH, + .size = sizeof(__vector128), + .align = sizeof(__vector128), + .get = s390_vxrs_high_get, + .set = s390_vxrs_high_set, + }, + { + .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, + }, + { + .core_note_type = NT_S390_GS_CB, + .n = sizeof(struct gs_cb) / sizeof(__u64), + .size = sizeof(__u64), + .align = sizeof(__u64), + .get = s390_gs_cb_get, + .set = s390_gs_cb_set, + }, + { + .core_note_type = NT_S390_GS_BC, + .n = sizeof(struct gs_cb) / sizeof(__u64), + .size = sizeof(__u64), + .align = sizeof(__u64), + .get = s390_gs_bc_get, + .set = s390_gs_bc_set, + }, + { + .core_note_type = NT_S390_RI_CB, + .n = sizeof(struct runtime_instr_cb) / sizeof(__u64), + .size = sizeof(__u64), + .align = sizeof(__u64), + .get = s390_runtime_instr_get, + .set = s390_runtime_instr_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 (kstrtoul(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; +} |