+++ /dev/null
-/*
- * linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
- * these modifications are Copyright 2004-2010 Analog Devices Inc.
- *
- * Licensed under the GPL-2
- */
-
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/sched/task_stack.h>
-#include <linux/mm.h>
-#include <linux/smp.h>
-#include <linux/elf.h>
-#include <linux/errno.h>
-#include <linux/ptrace.h>
-#include <linux/user.h>
-#include <linux/regset.h>
-#include <linux/signal.h>
-#include <linux/tracehook.h>
-#include <linux/uaccess.h>
-
-#include <asm/page.h>
-#include <asm/pgtable.h>
-#include <asm/processor.h>
-#include <asm/asm-offsets.h>
-#include <asm/dma.h>
-#include <asm/fixed_code.h>
-#include <asm/cacheflush.h>
-#include <asm/mem_map.h>
-#include <asm/mmu_context.h>
-
-/*
- * does not yet catch signals sent when the child dies.
- * in exit.c or in signal.c.
- */
-
-/*
- * Get contents of register REGNO in task TASK.
- */
-static inline long
-get_reg(struct task_struct *task, unsigned long regno,
- unsigned long __user *datap)
-{
- long tmp;
- struct pt_regs *regs = task_pt_regs(task);
-
- if (regno & 3 || regno > PT_LAST_PSEUDO)
- return -EIO;
-
- switch (regno) {
- case PT_TEXT_ADDR:
- tmp = task->mm->start_code;
- break;
- case PT_TEXT_END_ADDR:
- tmp = task->mm->end_code;
- break;
- case PT_DATA_ADDR:
- tmp = task->mm->start_data;
- break;
- case PT_USP:
- tmp = task->thread.usp;
- break;
- default:
- if (regno < sizeof(*regs)) {
- void *reg_ptr = regs;
- tmp = *(long *)(reg_ptr + regno);
- } else
- return -EIO;
- }
-
- return put_user(tmp, datap);
-}
-
-/*
- * Write contents of register REGNO in task TASK.
- */
-static inline int
-put_reg(struct task_struct *task, unsigned long regno, unsigned long data)
-{
- struct pt_regs *regs = task_pt_regs(task);
-
- if (regno & 3 || regno > PT_LAST_PSEUDO)
- return -EIO;
-
- switch (regno) {
- case PT_PC:
- /*********************************************************************/
- /* At this point the kernel is most likely in exception. */
- /* The RETX register will be used to populate the pc of the process. */
- /*********************************************************************/
- regs->retx = data;
- regs->pc = data;
- break;
- case PT_RETX:
- break; /* regs->retx = data; break; */
- case PT_USP:
- regs->usp = data;
- task->thread.usp = data;
- break;
- case PT_SYSCFG: /* don't let userspace screw with this */
- if ((data & ~1) != 0x6)
- pr_warning("ptrace: ignore syscfg write of %#lx\n", data);
- break; /* regs->syscfg = data; break; */
- default:
- if (regno < sizeof(*regs)) {
- void *reg_offset = regs;
- *(long *)(reg_offset + regno) = data;
- }
- /* Ignore writes to pseudo registers */
- }
-
- return 0;
-}
-
-/*
- * check that an address falls within the bounds of the target process's memory mappings
- */
-int
-is_user_addr_valid(struct task_struct *child, unsigned long start, unsigned long len)
-{
- bool valid;
- struct vm_area_struct *vma;
- struct sram_list_struct *sraml;
-
- /* overflow */
- if (start + len < start)
- return -EIO;
-
- down_read(&child->mm->mmap_sem);
- vma = find_vma(child->mm, start);
- valid = vma && start >= vma->vm_start && start + len <= vma->vm_end;
- up_read(&child->mm->mmap_sem);
- if (valid)
- return 0;
-
- for (sraml = child->mm->context.sram_list; sraml; sraml = sraml->next)
- if (start >= (unsigned long)sraml->addr
- && start + len < (unsigned long)sraml->addr + sraml->length)
- return 0;
-
- if (start >= FIXED_CODE_START && start + len < FIXED_CODE_END)
- return 0;
-
-#ifdef CONFIG_APP_STACK_L1
- if (child->mm->context.l1_stack_save)
- if (start >= (unsigned long)l1_stack_base &&
- start + len < (unsigned long)l1_stack_base + l1_stack_len)
- return 0;
-#endif
-
- return -EIO;
-}
-
-/*
- * retrieve the contents of Blackfin userspace general registers
- */
-static int genregs_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);
- int ret;
-
- /* This sucks ... */
- regs->usp = target->thread.usp;
-
- ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
- regs, 0, sizeof(*regs));
- if (ret < 0)
- return ret;
-
- return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
- sizeof(*regs), -1);
-}
-
-/*
- * update the contents of the Blackfin userspace general registers
- */
-static int genregs_set(struct task_struct *target,
- const struct user_regset *regset,
- unsigned int pos, unsigned int count,
- const void *kbuf, const void __user *ubuf)
-{
- struct pt_regs *regs = task_pt_regs(target);
- int ret;
-
- /* Don't let people set SYSCFG (it's at the end of pt_regs) */
- ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
- regs, 0, PT_SYSCFG);
- if (ret < 0)
- return ret;
-
- /* This sucks ... */
- target->thread.usp = regs->usp;
- /* regs->retx = regs->pc; */
-
- return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
- PT_SYSCFG, -1);
-}
-
-/*
- * Define the register sets available on the Blackfin under Linux
- */
-enum bfin_regset {
- REGSET_GENERAL,
-};
-
-static const struct user_regset bfin_regsets[] = {
- [REGSET_GENERAL] = {
- .core_note_type = NT_PRSTATUS,
- .n = sizeof(struct pt_regs) / sizeof(long),
- .size = sizeof(long),
- .align = sizeof(long),
- .get = genregs_get,
- .set = genregs_set,
- },
-};
-
-static const struct user_regset_view user_bfin_native_view = {
- .name = "Blackfin",
- .e_machine = EM_BLACKFIN,
- .regsets = bfin_regsets,
- .n = ARRAY_SIZE(bfin_regsets),
-};
-
-const struct user_regset_view *task_user_regset_view(struct task_struct *task)
-{
- return &user_bfin_native_view;
-}
-
-void user_enable_single_step(struct task_struct *child)
-{
- struct pt_regs *regs = task_pt_regs(child);
- regs->syscfg |= SYSCFG_SSSTEP;
-
- set_tsk_thread_flag(child, TIF_SINGLESTEP);
-}
-
-void user_disable_single_step(struct task_struct *child)
-{
- struct pt_regs *regs = task_pt_regs(child);
- regs->syscfg &= ~SYSCFG_SSSTEP;
-
- clear_tsk_thread_flag(child, TIF_SINGLESTEP);
-}
-
-long arch_ptrace(struct task_struct *child, long request,
- unsigned long addr, unsigned long data)
-{
- int ret;
- unsigned long __user *datap = (unsigned long __user *)data;
- void *paddr = (void *)addr;
-
- switch (request) {
- /* when I and D space are separate, these will need to be fixed. */
- case PTRACE_PEEKDATA:
- pr_debug("ptrace: PEEKDATA\n");
- /* fall through */
- case PTRACE_PEEKTEXT: /* read word at location addr. */
- {
- unsigned long tmp = 0;
- int copied = 0, to_copy = sizeof(tmp);
-
- ret = -EIO;
- pr_debug("ptrace: PEEKTEXT at addr 0x%08lx + %i\n", addr, to_copy);
- if (is_user_addr_valid(child, addr, to_copy) < 0)
- break;
- pr_debug("ptrace: user address is valid\n");
-
- switch (bfin_mem_access_type(addr, to_copy)) {
- case BFIN_MEM_ACCESS_CORE:
- case BFIN_MEM_ACCESS_CORE_ONLY:
- copied = ptrace_access_vm(child, addr, &tmp,
- to_copy, FOLL_FORCE);
- if (copied)
- break;
-
- /* hrm, why didn't that work ... maybe no mapping */
- if (addr >= FIXED_CODE_START &&
- addr + to_copy <= FIXED_CODE_END) {
- copy_from_user_page(0, 0, 0, &tmp, paddr, to_copy);
- copied = to_copy;
- } else if (addr >= BOOT_ROM_START) {
- memcpy(&tmp, paddr, to_copy);
- copied = to_copy;
- }
-
- break;
- case BFIN_MEM_ACCESS_DMA:
- if (safe_dma_memcpy(&tmp, paddr, to_copy))
- copied = to_copy;
- break;
- case BFIN_MEM_ACCESS_ITEST:
- if (isram_memcpy(&tmp, paddr, to_copy))
- copied = to_copy;
- break;
- default:
- copied = 0;
- break;
- }
-
- pr_debug("ptrace: copied size %d [0x%08lx]\n", copied, tmp);
- if (copied == to_copy)
- ret = put_user(tmp, datap);
- break;
- }
-
- /* when I and D space are separate, this will have to be fixed. */
- case PTRACE_POKEDATA:
- pr_debug("ptrace: PTRACE_PEEKDATA\n");
- /* fall through */
- case PTRACE_POKETEXT: /* write the word at location addr. */
- {
- int copied = 0, to_copy = sizeof(data);
-
- ret = -EIO;
- pr_debug("ptrace: POKETEXT at addr 0x%08lx + %i bytes %lx\n",
- addr, to_copy, data);
- if (is_user_addr_valid(child, addr, to_copy) < 0)
- break;
- pr_debug("ptrace: user address is valid\n");
-
- switch (bfin_mem_access_type(addr, to_copy)) {
- case BFIN_MEM_ACCESS_CORE:
- case BFIN_MEM_ACCESS_CORE_ONLY:
- copied = ptrace_access_vm(child, addr, &data,
- to_copy,
- FOLL_FORCE | FOLL_WRITE);
- break;
- case BFIN_MEM_ACCESS_DMA:
- if (safe_dma_memcpy(paddr, &data, to_copy))
- copied = to_copy;
- break;
- case BFIN_MEM_ACCESS_ITEST:
- if (isram_memcpy(paddr, &data, to_copy))
- copied = to_copy;
- break;
- default:
- copied = 0;
- break;
- }
-
- pr_debug("ptrace: copied size %d\n", copied);
- if (copied == to_copy)
- ret = 0;
- break;
- }
-
- case PTRACE_PEEKUSR:
- switch (addr) {
-#ifdef CONFIG_BINFMT_ELF_FDPIC /* backwards compat */
- case PT_FDPIC_EXEC:
- request = PTRACE_GETFDPIC;
- addr = PTRACE_GETFDPIC_EXEC;
- goto case_default;
- case PT_FDPIC_INTERP:
- request = PTRACE_GETFDPIC;
- addr = PTRACE_GETFDPIC_INTERP;
- goto case_default;
-#endif
- default:
- ret = get_reg(child, addr, datap);
- }
- pr_debug("ptrace: PEEKUSR reg %li with %#lx = %i\n", addr, data, ret);
- break;
-
- case PTRACE_POKEUSR:
- ret = put_reg(child, addr, data);
- pr_debug("ptrace: POKEUSR reg %li with %li = %i\n", addr, data, ret);
- break;
-
- case PTRACE_GETREGS:
- pr_debug("ptrace: PTRACE_GETREGS\n");
- return copy_regset_to_user(child, &user_bfin_native_view,
- REGSET_GENERAL,
- 0, sizeof(struct pt_regs),
- datap);
-
- case PTRACE_SETREGS:
- pr_debug("ptrace: PTRACE_SETREGS\n");
- return copy_regset_from_user(child, &user_bfin_native_view,
- REGSET_GENERAL,
- 0, sizeof(struct pt_regs),
- datap);
-
- case_default:
- default:
- ret = ptrace_request(child, request, addr, data);
- break;
- }
-
- return ret;
-}
-
-asmlinkage int syscall_trace_enter(struct pt_regs *regs)
-{
- int ret = 0;
-
- if (test_thread_flag(TIF_SYSCALL_TRACE))
- ret = tracehook_report_syscall_entry(regs);
-
- return ret;
-}
-
-asmlinkage void syscall_trace_leave(struct pt_regs *regs)
-{
- int step;
-
- step = test_thread_flag(TIF_SINGLESTEP);
- if (step || test_thread_flag(TIF_SYSCALL_TRACE))
- tracehook_report_syscall_exit(regs, step);
-}
git.samba.org / sfrench / cifs-2.6.git / blobdiff