| // TODO some minor issues |
| /* |
| * This file is subject to the terms and conditions of the GNU General Public |
| * License. See the file "COPYING" in the main directory of this archive |
| * for more details. |
| * |
| * Copyright (C) 2001 - 2005 Tensilica Inc. |
| * |
| * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com> |
| * Chris Zankel <chris@zankel.net> |
| * Scott Foehner<sfoehner@yahoo.com>, |
| * Kevin Chea |
| * Marc Gauthier<marc@tensilica.com> <marc@alumni.uwaterloo.ca> |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/sched.h> |
| #include <linux/mm.h> |
| #include <linux/errno.h> |
| #include <linux/ptrace.h> |
| #include <linux/smp.h> |
| #include <linux/smp_lock.h> |
| #include <linux/security.h> |
| #include <linux/signal.h> |
| |
| #include <asm/pgtable.h> |
| #include <asm/page.h> |
| #include <asm/system.h> |
| #include <asm/uaccess.h> |
| #include <asm/ptrace.h> |
| #include <asm/elf.h> |
| |
| #define TEST_KERNEL // verify kernel operations FIXME: remove |
| |
| |
| /* |
| * Called by kernel/ptrace.c when detaching.. |
| * |
| * Make sure single step bits etc are not set. |
| */ |
| |
| void ptrace_disable(struct task_struct *child) |
| { |
| /* Nothing to do.. */ |
| } |
| |
| long arch_ptrace(struct task_struct *child, long request, long addr, long data) |
| { |
| int ret = -EPERM; |
| |
| switch (request) { |
| case PTRACE_PEEKTEXT: /* read word at location addr. */ |
| case PTRACE_PEEKDATA: |
| { |
| unsigned long tmp; |
| int copied; |
| |
| copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0); |
| ret = -EIO; |
| if (copied != sizeof(tmp)) |
| break; |
| ret = put_user(tmp,(unsigned long *) data); |
| |
| goto out; |
| } |
| |
| /* Read the word at location addr in the USER area. */ |
| |
| case PTRACE_PEEKUSR: |
| { |
| struct pt_regs *regs; |
| unsigned long tmp; |
| |
| regs = task_pt_regs(child); |
| tmp = 0; /* Default return value. */ |
| |
| switch(addr) { |
| |
| case REG_AR_BASE ... REG_AR_BASE + XCHAL_NUM_AREGS - 1: |
| { |
| int ar = addr - REG_AR_BASE - regs->windowbase * 4; |
| ar &= (XCHAL_NUM_AREGS - 1); |
| if (ar < 16 && ar + (regs->wmask >> 4) * 4 >= 0) |
| tmp = regs->areg[ar]; |
| else |
| ret = -EIO; |
| break; |
| } |
| case REG_A_BASE ... REG_A_BASE + 15: |
| tmp = regs->areg[addr - REG_A_BASE]; |
| break; |
| case REG_PC: |
| tmp = regs->pc; |
| break; |
| case REG_PS: |
| /* Note: PS.EXCM is not set while user task is running; |
| * its being set in regs is for exception handling |
| * convenience. */ |
| tmp = (regs->ps & ~XCHAL_PS_EXCM_MASK); |
| break; |
| case REG_WB: |
| tmp = regs->windowbase; |
| break; |
| case REG_WS: |
| tmp = regs->windowstart; |
| break; |
| case REG_LBEG: |
| tmp = regs->lbeg; |
| break; |
| case REG_LEND: |
| tmp = regs->lend; |
| break; |
| case REG_LCOUNT: |
| tmp = regs->lcount; |
| break; |
| case REG_SAR: |
| tmp = regs->sar; |
| break; |
| case REG_DEPC: |
| tmp = regs->depc; |
| break; |
| case REG_EXCCAUSE: |
| tmp = regs->exccause; |
| break; |
| case REG_EXCVADDR: |
| tmp = regs->excvaddr; |
| break; |
| case SYSCALL_NR: |
| tmp = regs->syscall; |
| break; |
| default: |
| tmp = 0; |
| ret = -EIO; |
| goto out; |
| } |
| ret = put_user(tmp, (unsigned long *) data); |
| goto out; |
| } |
| |
| case PTRACE_POKETEXT: /* write the word at location addr. */ |
| case PTRACE_POKEDATA: |
| if (access_process_vm(child, addr, &data, sizeof(data), 1) |
| == sizeof(data)) |
| break; |
| ret = -EIO; |
| goto out; |
| |
| case PTRACE_POKEUSR: |
| { |
| struct pt_regs *regs; |
| regs = task_pt_regs(child); |
| |
| switch (addr) { |
| case REG_AR_BASE ... REG_AR_BASE + XCHAL_NUM_AREGS - 1: |
| { |
| int ar = addr - REG_AR_BASE - regs->windowbase * 4; |
| if (ar < 16 && ar + (regs->wmask >> 4) * 4 >= 0) |
| regs->areg[ar & (XCHAL_NUM_AREGS - 1)] = data; |
| else |
| ret = -EIO; |
| break; |
| } |
| case REG_A_BASE ... REG_A_BASE + 15: |
| regs->areg[addr - REG_A_BASE] = data; |
| break; |
| case REG_PC: |
| regs->pc = data; |
| break; |
| case SYSCALL_NR: |
| regs->syscall = data; |
| break; |
| #ifdef TEST_KERNEL |
| case REG_WB: |
| regs->windowbase = data; |
| break; |
| case REG_WS: |
| regs->windowstart = data; |
| break; |
| #endif |
| |
| default: |
| /* The rest are not allowed. */ |
| ret = -EIO; |
| break; |
| } |
| break; |
| } |
| |
| /* continue and stop at next (return from) syscall */ |
| case PTRACE_SYSCALL: |
| case PTRACE_CONT: /* restart after signal. */ |
| { |
| ret = -EIO; |
| if (!valid_signal(data)) |
| break; |
| if (request == PTRACE_SYSCALL) |
| set_tsk_thread_flag(child, TIF_SYSCALL_TRACE); |
| else |
| clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); |
| child->exit_code = data; |
| /* Make sure the single step bit is not set. */ |
| child->ptrace &= ~PT_SINGLESTEP; |
| wake_up_process(child); |
| ret = 0; |
| break; |
| } |
| |
| /* |
| * make the child exit. Best I can do is send it a sigkill. |
| * perhaps it should be put in the status that it wants to |
| * exit. |
| */ |
| case PTRACE_KILL: |
| ret = 0; |
| if (child->state == EXIT_ZOMBIE) /* already dead */ |
| break; |
| child->exit_code = SIGKILL; |
| child->ptrace &= ~PT_SINGLESTEP; |
| wake_up_process(child); |
| break; |
| |
| case PTRACE_SINGLESTEP: |
| ret = -EIO; |
| if (!valid_signal(data)) |
| break; |
| clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); |
| child->ptrace |= PT_SINGLESTEP; |
| child->exit_code = data; |
| wake_up_process(child); |
| ret = 0; |
| break; |
| |
| case PTRACE_GETREGS: |
| { |
| /* 'data' points to user memory in which to write. |
| * Mainly due to the non-live register values, we |
| * reformat the register values into something more |
| * standard. For convenience, we use the handy |
| * elf_gregset_t format. */ |
| |
| xtensa_gregset_t format; |
| struct pt_regs *regs = task_pt_regs(child); |
| |
| do_copy_regs (&format, regs, child); |
| |
| /* Now, copy to user space nice and easy... */ |
| ret = 0; |
| if (copy_to_user((void *)data, &format, sizeof(elf_gregset_t))) |
| ret = -EFAULT; |
| break; |
| } |
| |
| case PTRACE_SETREGS: |
| { |
| /* 'data' points to user memory that contains the new |
| * values in the elf_gregset_t format. */ |
| |
| xtensa_gregset_t format; |
| struct pt_regs *regs = task_pt_regs(child); |
| |
| if (copy_from_user(&format,(void *)data,sizeof(elf_gregset_t))){ |
| ret = -EFAULT; |
| break; |
| } |
| |
| /* FIXME: Perhaps we want some sanity checks on |
| * these user-space values? See ARM version. Are |
| * debuggers a security concern? */ |
| |
| do_restore_regs (&format, regs, child); |
| |
| ret = 0; |
| break; |
| } |
| |
| case PTRACE_GETFPREGS: |
| { |
| /* 'data' points to user memory in which to write. |
| * For convenience, we use the handy |
| * elf_fpregset_t format. */ |
| |
| elf_fpregset_t fpregs; |
| struct pt_regs *regs = task_pt_regs(child); |
| |
| do_save_fpregs (&fpregs, regs, child); |
| |
| /* Now, copy to user space nice and easy... */ |
| ret = 0; |
| if (copy_to_user((void *)data, &fpregs, sizeof(elf_fpregset_t))) |
| ret = -EFAULT; |
| |
| break; |
| } |
| |
| case PTRACE_SETFPREGS: |
| { |
| /* 'data' points to user memory that contains the new |
| * values in the elf_fpregset_t format. |
| */ |
| elf_fpregset_t fpregs; |
| struct pt_regs *regs = task_pt_regs(child); |
| |
| ret = 0; |
| if (copy_from_user(&fpregs, (void *)data, sizeof(elf_fpregset_t))) { |
| ret = -EFAULT; |
| break; |
| } |
| |
| if (do_restore_fpregs (&fpregs, regs, child)) |
| ret = -EIO; |
| break; |
| } |
| |
| case PTRACE_GETFPREGSIZE: |
| /* 'data' points to 'unsigned long' set to the size |
| * of elf_fpregset_t |
| */ |
| ret = put_user(sizeof(elf_fpregset_t), (unsigned long *) data); |
| break; |
| |
| case PTRACE_DETACH: /* detach a process that was attached. */ |
| ret = ptrace_detach(child, data); |
| break; |
| |
| default: |
| ret = ptrace_request(child, request, addr, data); |
| goto out; |
| } |
| out: |
| return ret; |
| } |
| |
| void do_syscall_trace(void) |
| { |
| if (!test_thread_flag(TIF_SYSCALL_TRACE)) |
| return; |
| |
| if (!(current->ptrace & PT_PTRACED)) |
| return; |
| |
| /* |
| * The 0x80 provides a way for the tracing parent to distinguish |
| * between a syscall stop and SIGTRAP delivery |
| */ |
| ptrace_notify(SIGTRAP|((current->ptrace & PT_TRACESYSGOOD) ? 0x80 : 0)); |
| |
| /* |
| * this isn't the same as continuing with a signal, but it will do |
| * for normal use. strace only continues with a signal if the |
| * stopping signal is not SIGTRAP. -brl |
| */ |
| if (current->exit_code) { |
| send_sig(current->exit_code, current, 1); |
| current->exit_code = 0; |
| } |
| } |