summaryrefslogtreecommitdiffstats
path: root/arch/s390/kernel/ptrace.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/s390/kernel/ptrace.c')
-rw-r--r--arch/s390/kernel/ptrace.c1608
1 files changed, 1608 insertions, 0 deletions
diff --git a/arch/s390/kernel/ptrace.c b/arch/s390/kernel/ptrace.c
new file mode 100644
index 0000000000..ea244a73ef
--- /dev/null
+++ b/arch/s390/kernel/ptrace.c
@@ -0,0 +1,1608 @@
+// 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 "asm/ptrace.h"
+#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/seccomp.h>
+#include <linux/compat.h>
+#include <trace/syscall.h>
+#include <asm/page.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
+
+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_tsk_thread_flag(task, TIF_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)
+{
+ if (addr == offsetof(struct per_struct_kernel, 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 == offsetof(struct per_struct_kernel, cr10))
+ /* Start address of the active per set. */
+ return test_thread_flag(TIF_SINGLE_STEP) ?
+ 0 : child->thread.per_user.start;
+ else if (addr == offsetof(struct per_struct_kernel, cr11))
+ /* End address of the active per set. */
+ return test_thread_flag(TIF_SINGLE_STEP) ?
+ -1UL : child->thread.per_user.end;
+ else if (addr == offsetof(struct per_struct_kernel, bits))
+ /* Single-step bit. */
+ return test_thread_flag(TIF_SINGLE_STEP) ?
+ (1UL << (BITS_PER_LONG - 1)) : 0;
+ else if (addr == offsetof(struct per_struct_kernel, starting_addr))
+ /* Start address of the user specified per set. */
+ return child->thread.per_user.start;
+ else if (addr == offsetof(struct per_struct_kernel, ending_addr))
+ /* End address of the user specified per set. */
+ return child->thread.per_user.end;
+ else if (addr == offsetof(struct per_struct_kernel, 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 == offsetof(struct per_struct_kernel, address))
+ /* Address of the last PER trap */
+ return child->thread.per_event.address;
+ else if (addr == offsetof(struct per_struct_kernel, 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)
+{
+ addr_t offset, tmp;
+
+ if (addr < offsetof(struct user, regs.acrs)) {
+ /*
+ * psw and gprs are stored on the stack
+ */
+ tmp = *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr);
+ if (addr == offsetof(struct user, regs.psw.mask)) {
+ /* Return a clean psw mask. */
+ tmp &= PSW_MASK_USER | PSW_MASK_RI;
+ tmp |= PSW_USER_BITS;
+ }
+
+ } else if (addr < offsetof(struct user, regs.orig_gpr2)) {
+ /*
+ * access registers are stored in the thread structure
+ */
+ offset = addr - offsetof(struct user, 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 == offsetof(struct user, regs.acrs[15]))
+ tmp = ((unsigned long) child->thread.acrs[15]) << 32;
+ else
+ tmp = *(addr_t *)((addr_t) &child->thread.acrs + offset);
+
+ } else if (addr == offsetof(struct user, regs.orig_gpr2)) {
+ /*
+ * orig_gpr2 is stored on the kernel stack
+ */
+ tmp = (addr_t) task_pt_regs(child)->orig_gpr2;
+
+ } else if (addr < offsetof(struct user, regs.fp_regs)) {
+ /*
+ * prevent reads of padding hole between
+ * orig_gpr2 and fp_regs on s390.
+ */
+ tmp = 0;
+
+ } else if (addr == offsetof(struct user, 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 < offsetof(struct user, regs.fp_regs) + sizeof(s390_fp_regs)) {
+ /*
+ * floating point regs. are either in child->thread.fpu
+ * or the child->thread.fpu.vxrs array
+ */
+ offset = addr - offsetof(struct user, 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 < offsetof(struct user, regs.per_info) + sizeof(per_struct)) {
+ /*
+ * Handle access to the per_info structure.
+ */
+ addr -= offsetof(struct user, 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 >= offsetof(struct user, regs.acrs) &&
+ addr < offsetof(struct user, 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)
+{
+ /*
+ * 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 == offsetof(struct per_struct_kernel, 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 == offsetof(struct per_struct_kernel, starting_addr))
+ /* Starting address of the user specified per set. */
+ child->thread.per_user.start = data;
+ else if (addr == offsetof(struct per_struct_kernel, 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)
+{
+ addr_t offset;
+
+
+ if (addr < offsetof(struct user, regs.acrs)) {
+ struct pt_regs *regs = task_pt_regs(child);
+ /*
+ * psw and gprs are stored on the stack
+ */
+ if (addr == offsetof(struct user, 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])) {
+ struct pt_regs *regs = task_pt_regs(child);
+
+ regs->int_code = 0x20000 | (data & 0xffff);
+ }
+ *(addr_t *)((addr_t) &regs->psw + addr) = data;
+ } else if (addr < offsetof(struct user, regs.orig_gpr2)) {
+ /*
+ * access registers are stored in the thread structure
+ */
+ offset = addr - offsetof(struct user, 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 == offsetof(struct user, regs.acrs[15]))
+ child->thread.acrs[15] = (unsigned int) (data >> 32);
+ else
+ *(addr_t *)((addr_t) &child->thread.acrs + offset) = data;
+
+ } else if (addr == offsetof(struct user, regs.orig_gpr2)) {
+ /*
+ * orig_gpr2 is stored on the kernel stack
+ */
+ task_pt_regs(child)->orig_gpr2 = data;
+
+ } else if (addr < offsetof(struct user, regs.fp_regs)) {
+ /*
+ * prevent writes of padding hole between
+ * orig_gpr2 and fp_regs on s390.
+ */
+ return 0;
+
+ } else if (addr == offsetof(struct user, 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 < offsetof(struct user, regs.fp_regs) + sizeof(s390_fp_regs)) {
+ /*
+ * floating point regs. are either in child->thread.fpu
+ * or the child->thread.fpu.vxrs array
+ */
+ offset = addr - offsetof(struct user, 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 < offsetof(struct user, regs.per_info) + sizeof(per_struct)) {
+ /*
+ * Handle access to the per_info structure.
+ */
+ addr -= offsetof(struct user, 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 >= offsetof(struct user, regs.acrs) &&
+ addr < offsetof(struct user, 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:
+ return put_user(child->thread.last_break, (unsigned long __user *)data);
+ 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)
+{
+ if (addr == offsetof(struct compat_per_struct_kernel, 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 == offsetof(struct compat_per_struct_kernel, 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 == offsetof(struct compat_per_struct_kernel, 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 == offsetof(struct compat_per_struct_kernel, bits))
+ /* Single-step bit. */
+ return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
+ 0x80000000 : 0;
+ else if (addr == offsetof(struct compat_per_struct_kernel, starting_addr))
+ /* Start address of the user specified per set. */
+ return (__u32) child->thread.per_user.start;
+ else if (addr == offsetof(struct compat_per_struct_kernel, ending_addr))
+ /* End address of the user specified per set. */
+ return (__u32) child->thread.per_user.end;
+ else if (addr == offsetof(struct compat_per_struct_kernel, perc_atmid))
+ /* PER code, ATMID and AI of the last PER trap */
+ return (__u32) child->thread.per_event.cause << 16;
+ else if (addr == offsetof(struct compat_per_struct_kernel, address))
+ /* Address of the last PER trap */
+ return (__u32) child->thread.per_event.address;
+ else if (addr == offsetof(struct compat_per_struct_kernel, 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)
+{
+ addr_t offset;
+ __u32 tmp;
+
+ if (addr < offsetof(struct compat_user, regs.acrs)) {
+ struct pt_regs *regs = task_pt_regs(child);
+ /*
+ * psw and gprs are stored on the stack
+ */
+ if (addr == offsetof(struct compat_user, 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 == offsetof(struct compat_user, 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) &regs->psw + addr*2 + 4);
+ }
+ } else if (addr < offsetof(struct compat_user, regs.orig_gpr2)) {
+ /*
+ * access registers are stored in the thread structure
+ */
+ offset = addr - offsetof(struct compat_user, regs.acrs);
+ tmp = *(__u32*)((addr_t) &child->thread.acrs + offset);
+
+ } else if (addr == offsetof(struct compat_user, 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 < offsetof(struct compat_user, regs.fp_regs)) {
+ /*
+ * prevent reads of padding hole between
+ * orig_gpr2 and fp_regs on s390.
+ */
+ tmp = 0;
+
+ } else if (addr == offsetof(struct compat_user, regs.fp_regs.fpc)) {
+ /*
+ * floating point control reg. is in the thread structure
+ */
+ tmp = child->thread.fpu.fpc;
+
+ } else if (addr < offsetof(struct compat_user, regs.fp_regs) + sizeof(s390_fp_regs)) {
+ /*
+ * floating point regs. are either in child->thread.fpu
+ * or the child->thread.fpu.vxrs array
+ */
+ offset = addr - offsetof(struct compat_user, 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 < offsetof(struct compat_user, regs.per_info) + sizeof(struct compat_per_struct_kernel)) {
+ /*
+ * Handle access to the per_info structure.
+ */
+ addr -= offsetof(struct compat_user, 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)
+{
+ if (addr == offsetof(struct compat_per_struct_kernel, 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 == offsetof(struct compat_per_struct_kernel, starting_addr))
+ /* Starting address of the user specified per set. */
+ child->thread.per_user.start = data;
+ else if (addr == offsetof(struct compat_per_struct_kernel, 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)
+{
+ __u32 tmp = (__u32) data;
+ addr_t offset;
+
+ if (addr < offsetof(struct compat_user, regs.acrs)) {
+ struct pt_regs *regs = task_pt_regs(child);
+ /*
+ * psw, gprs, acrs and orig_gpr2 are stored on the stack
+ */
+ if (addr == offsetof(struct compat_user, 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 == offsetof(struct compat_user, 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])) {
+ struct pt_regs *regs = task_pt_regs(child);
+
+ regs->int_code = 0x20000 | (data & 0xffff);
+ }
+ /* gpr 0-15 */
+ *(__u32*)((addr_t) &regs->psw + addr*2 + 4) = tmp;
+ }
+ } else if (addr < offsetof(struct compat_user, regs.orig_gpr2)) {
+ /*
+ * access registers are stored in the thread structure
+ */
+ offset = addr - offsetof(struct compat_user, regs.acrs);
+ *(__u32*)((addr_t) &child->thread.acrs + offset) = tmp;
+
+ } else if (addr == offsetof(struct compat_user, 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 < offsetof(struct compat_user, regs.fp_regs)) {
+ /*
+ * prevent writess of padding hole between
+ * orig_gpr2 and fp_regs on s390.
+ */
+ return 0;
+
+ } else if (addr == offsetof(struct compat_user, 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 < offsetof(struct compat_user, regs.fp_regs) + sizeof(s390_fp_regs)) {
+ /*
+ * floating point regs. are either in child->thread.fpu
+ * or the child->thread.fpu.vxrs array
+ */
+ offset = addr - offsetof(struct compat_user, 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 < offsetof(struct compat_user, regs.per_info) + sizeof(struct compat_per_struct_kernel)) {
+ /*
+ * Handle access to the per_info structure.
+ */
+ addr -= offsetof(struct compat_user, 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:
+ return put_user(child->thread.last_break, (unsigned int __user *)data);
+ }
+ return compat_ptrace_request(child, request, addr, data);
+}
+#endif
+
+/*
+ * user_regset definitions.
+ */
+
+static int s390_regs_get(struct task_struct *target,
+ const struct user_regset *regset,
+ struct membuf to)
+{
+ unsigned pos;
+ if (target == current)
+ save_access_regs(target->thread.acrs);
+
+ for (pos = 0; pos < sizeof(s390_regs); pos += sizeof(long))
+ membuf_store(&to, __peek_user(target, pos));
+ 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,
+ struct membuf to)
+{
+ _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 membuf_write(&to, &fp_regs, sizeof(fp_regs));
+}
+
+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,
+ struct membuf to)
+{
+ return membuf_store(&to, target->thread.last_break);
+}
+
+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,
+ struct membuf to)
+{
+ struct pt_regs *regs = task_pt_regs(target);
+ size_t size;
+
+ if (!(regs->int_code & 0x200))
+ return -ENODATA;
+ size = sizeof(target->thread.trap_tdb.data);
+ return membuf_write(&to, target->thread.trap_tdb.data, size);
+}
+
+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,
+ struct membuf to)
+{
+ __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] = target->thread.fpu.vxrs[i].low;
+ return membuf_write(&to, vxrs, sizeof(vxrs));
+}
+
+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] = target->thread.fpu.vxrs[i].low;
+
+ rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1);
+ if (rc == 0)
+ for (i = 0; i < __NUM_VXRS_LOW; i++)
+ target->thread.fpu.vxrs[i].low = vxrs[i];
+
+ return rc;
+}
+
+static int s390_vxrs_high_get(struct task_struct *target,
+ const struct user_regset *regset,
+ struct membuf to)
+{
+ if (!MACHINE_HAS_VX)
+ return -ENODEV;
+ if (target == current)
+ save_fpu_regs();
+ return membuf_write(&to, target->thread.fpu.vxrs + __NUM_VXRS_LOW,
+ __NUM_VXRS_HIGH * sizeof(__vector128));
+}
+
+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,
+ struct membuf to)
+{
+ return membuf_store(&to, target->thread.system_call);
+}
+
+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,
+ struct membuf to)
+{
+ 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 membuf_write(&to, data, 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,
+ struct membuf to)
+{
+ struct gs_cb *data = target->thread.gs_bc_cb;
+
+ if (!MACHINE_HAS_GS)
+ return -ENODEV;
+ if (!data)
+ return -ENODATA;
+ return membuf_write(&to, data, 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,
+ struct membuf to)
+{
+ struct runtime_instr_cb *data = target->thread.ri_cb;
+
+ if (!test_facility(64))
+ return -ENODEV;
+ if (!data)
+ return -ENODATA;
+
+ return membuf_write(&to, data, 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),
+ .regset_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),
+ .regset_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),
+ .regset_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),
+ .regset_get = s390_last_break_get,
+ .set = s390_last_break_set,
+ },
+ {
+ .core_note_type = NT_S390_TDB,
+ .n = 1,
+ .size = 256,
+ .align = 1,
+ .regset_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),
+ .regset_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),
+ .regset_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),
+ .regset_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),
+ .regset_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),
+ .regset_get = s390_runtime_instr_get,
+ .set = s390_runtime_instr_set,
+ },
+};
+
+static const struct user_regset_view user_s390_view = {
+ .name = "s390x",
+ .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,
+ struct membuf to)
+{
+ unsigned n;
+
+ if (target == current)
+ save_access_regs(target->thread.acrs);
+
+ for (n = 0; n < sizeof(s390_compat_regs); n += sizeof(compat_ulong_t))
+ membuf_store(&to, __peek_user_compat(target, n));
+ 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,
+ struct membuf to)
+{
+ compat_ulong_t *gprs_high;
+ int i;
+
+ gprs_high = (compat_ulong_t *)task_pt_regs(target)->gprs;
+ for (i = 0; i < NUM_GPRS; i++, gprs_high += 2)
+ membuf_store(&to, *gprs_high);
+ 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,
+ struct membuf to)
+{
+ compat_ulong_t last_break = target->thread.last_break;
+
+ return membuf_store(&to, (unsigned long)last_break);
+}
+
+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),
+ .regset_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),
+ .regset_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),
+ .regset_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),
+ .regset_get = s390_compat_last_break_get,
+ .set = s390_compat_last_break_set,
+ },
+ {
+ .core_note_type = NT_S390_TDB,
+ .n = 1,
+ .size = 256,
+ .align = 1,
+ .regset_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),
+ .regset_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),
+ .regset_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),
+ .regset_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),
+ .regset_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),
+ .regset_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),
+ .regset_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;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-02 22:54:34 +0000