From d52e9d690fff1fd9d0ccffe375fd01b700f82a64 Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Wed, 30 Jan 2008 13:31:01 +0100 Subject: x86: ptrace_32 renamed This renames ptrace_32.c back to ptrace.c, in preparation for merging the 32/64 versions of these files. Signed-off-by: Roland McGrath Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- arch/x86/kernel/ptrace_32.c | 484 -------------------------------------------- 1 file changed, 484 deletions(-) delete mode 100644 arch/x86/kernel/ptrace_32.c (limited to 'arch/x86/kernel/ptrace_32.c') diff --git a/arch/x86/kernel/ptrace_32.c b/arch/x86/kernel/ptrace_32.c deleted file mode 100644 index fed83d06613..00000000000 --- a/arch/x86/kernel/ptrace_32.c +++ /dev/null @@ -1,484 +0,0 @@ -/* By Ross Biro 1/23/92 */ -/* - * Pentium III FXSR, SSE support - * Gareth Hughes , May 2000 - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include -#include -#include -#include -#include -#include -#include - -/* - * does not yet catch signals sent when the child dies. - * in exit.c or in signal.c. - */ - -/* - * Determines which flags the user has access to [1 = access, 0 = no access]. - * Prohibits changing ID(21), VIP(20), VIF(19), VM(17), NT(14), IOPL(12-13), IF(9). - * Also masks reserved bits (31-22, 15, 5, 3, 1). - */ -#define FLAG_MASK 0x00050dd5 - -static long *pt_regs_access(struct pt_regs *regs, unsigned long regno) -{ - BUILD_BUG_ON(offsetof(struct pt_regs, bx) != 0); - if (regno > FS) - --regno; - return ®s->bx + regno; -} - -static int putreg(struct task_struct *child, - unsigned long regno, unsigned long value) -{ - struct pt_regs *regs = task_pt_regs(child); - regno >>= 2; - switch (regno) { - case GS: - if (value && (value & 3) != 3) - return -EIO; - child->thread.gs = value; - if (child == current) - /* - * The user-mode %gs is not affected by - * kernel entry, so we must update the CPU. - */ - loadsegment(gs, value); - return 0; - case DS: - case ES: - case FS: - if (value && (value & 3) != 3) - return -EIO; - value &= 0xffff; - break; - case SS: - case CS: - if ((value & 3) != 3) - return -EIO; - value &= 0xffff; - break; - case EFL: - value &= FLAG_MASK; - /* - * If the user value contains TF, mark that - * it was not "us" (the debugger) that set it. - * If not, make sure it stays set if we had. - */ - if (value & X86_EFLAGS_TF) - clear_tsk_thread_flag(child, TIF_FORCED_TF); - else if (test_tsk_thread_flag(child, TIF_FORCED_TF)) - value |= X86_EFLAGS_TF; - value |= regs->flags & ~FLAG_MASK; - break; - } - *pt_regs_access(regs, regno) = value; - return 0; -} - -static unsigned long getreg(struct task_struct *child, unsigned long regno) -{ - struct pt_regs *regs = task_pt_regs(child); - unsigned long retval = ~0UL; - - regno >>= 2; - switch (regno) { - case EFL: - /* - * If the debugger set TF, hide it from the readout. - */ - retval = regs->flags; - if (test_tsk_thread_flag(child, TIF_FORCED_TF)) - retval &= ~X86_EFLAGS_TF; - break; - case GS: - retval = child->thread.gs; - if (child == current) - savesegment(gs, retval); - break; - case DS: - case ES: - case FS: - case SS: - case CS: - retval = 0xffff; - /* fall through */ - default: - retval &= *pt_regs_access(regs, regno); - } - return retval; -} - -/* - * This function is trivial and will be inlined by the compiler. - * Having it separates the implementation details of debug - * registers from the interface details of ptrace. - */ -static unsigned long ptrace_get_debugreg(struct task_struct *child, int n) -{ - switch (n) { - case 0: return child->thread.debugreg0; - case 1: return child->thread.debugreg1; - case 2: return child->thread.debugreg2; - case 3: return child->thread.debugreg3; - case 6: return child->thread.debugreg6; - case 7: return child->thread.debugreg7; - } - return 0; -} - -static int ptrace_set_debugreg(struct task_struct *child, - int n, unsigned long data) -{ - int i; - - if (unlikely(n == 4 || n == 5)) - return -EIO; - - if (n < 4 && unlikely(data >= TASK_SIZE - 3)) - return -EIO; - - switch (n) { - case 0: child->thread.debugreg0 = data; break; - case 1: child->thread.debugreg1 = data; break; - case 2: child->thread.debugreg2 = data; break; - case 3: child->thread.debugreg3 = data; break; - - case 6: - child->thread.debugreg6 = data; - break; - - case 7: - /* - * Sanity-check data. Take one half-byte at once with - * check = (val >> (16 + 4*i)) & 0xf. It contains the - * R/Wi and LENi bits; bits 0 and 1 are R/Wi, and bits - * 2 and 3 are LENi. Given a list of invalid values, - * we do mask |= 1 << invalid_value, so that - * (mask >> check) & 1 is a correct test for invalid - * values. - * - * R/Wi contains the type of the breakpoint / - * watchpoint, LENi contains the length of the watched - * data in the watchpoint case. - * - * The invalid values are: - * - LENi == 0x10 (undefined), so mask |= 0x0f00. - * - R/Wi == 0x10 (break on I/O reads or writes), so - * mask |= 0x4444. - * - R/Wi == 0x00 && LENi != 0x00, so we have mask |= - * 0x1110. - * - * Finally, mask = 0x0f00 | 0x4444 | 0x1110 == 0x5f54. - * - * See the Intel Manual "System Programming Guide", - * 15.2.4 - * - * Note that LENi == 0x10 is defined on x86_64 in long - * mode (i.e. even for 32-bit userspace software, but - * 64-bit kernel), so the x86_64 mask value is 0x5454. - * See the AMD manual no. 24593 (AMD64 System Programming) - */ - data &= ~DR_CONTROL_RESERVED; - for (i = 0; i < 4; i++) - if ((0x5f54 >> ((data >> (16 + 4*i)) & 0xf)) & 1) - return -EIO; - child->thread.debugreg7 = data; - if (data) - set_tsk_thread_flag(child, TIF_DEBUG); - else - clear_tsk_thread_flag(child, TIF_DEBUG); - break; - } - - return 0; -} - -/* - * Called by kernel/ptrace.c when detaching.. - * - * Make sure the single step bit is not set. - */ -void ptrace_disable(struct task_struct *child) -{ - user_disable_single_step(child); - clear_tsk_thread_flag(child, TIF_SYSCALL_EMU); -} - -long arch_ptrace(struct task_struct *child, long request, long addr, long data) -{ - struct user * dummy = NULL; - int i, ret; - unsigned long __user *datap = (unsigned long __user *)data; - - switch (request) { - /* when I and D space are separate, these will need to be fixed. */ - case PTRACE_PEEKTEXT: /* read word at location addr. */ - case PTRACE_PEEKDATA: - ret = generic_ptrace_peekdata(child, addr, data); - break; - - /* read the word at location addr in the USER area. */ - case PTRACE_PEEKUSR: { - unsigned long tmp; - - ret = -EIO; - if ((addr & 3) || addr < 0 || - addr > sizeof(struct user) - 3) - break; - - tmp = 0; /* Default return condition */ - if(addr < FRAME_SIZE*sizeof(long)) - tmp = getreg(child, addr); - if(addr >= (long) &dummy->u_debugreg[0] && - addr <= (long) &dummy->u_debugreg[7]){ - addr -= (long) &dummy->u_debugreg[0]; - addr = addr >> 2; - tmp = ptrace_get_debugreg(child, addr); - } - ret = put_user(tmp, datap); - break; - } - - /* when I and D space are separate, this will have to be fixed. */ - case PTRACE_POKETEXT: /* write the word at location addr. */ - case PTRACE_POKEDATA: - ret = generic_ptrace_pokedata(child, addr, data); - break; - - case PTRACE_POKEUSR: /* write the word at location addr in the USER area */ - ret = -EIO; - if ((addr & 3) || addr < 0 || - addr > sizeof(struct user) - 3) - break; - - if (addr < FRAME_SIZE*sizeof(long)) { - ret = putreg(child, addr, data); - break; - } - /* We need to be very careful here. We implicitly - want to modify a portion of the task_struct, and we - have to be selective about what portions we allow someone - to modify. */ - - ret = -EIO; - if(addr >= (long) &dummy->u_debugreg[0] && - addr <= (long) &dummy->u_debugreg[7]){ - addr -= (long) &dummy->u_debugreg; - addr = addr >> 2; - ret = ptrace_set_debugreg(child, addr, data); - } - break; - - case PTRACE_GETREGS: { /* Get all gp regs from the child. */ - if (!access_ok(VERIFY_WRITE, datap, FRAME_SIZE*sizeof(long))) { - ret = -EIO; - break; - } - for ( i = 0; i < FRAME_SIZE*sizeof(long); i += sizeof(long) ) { - __put_user(getreg(child, i), datap); - datap++; - } - ret = 0; - break; - } - - case PTRACE_SETREGS: { /* Set all gp regs in the child. */ - unsigned long tmp; - if (!access_ok(VERIFY_READ, datap, FRAME_SIZE*sizeof(long))) { - ret = -EIO; - break; - } - for ( i = 0; i < FRAME_SIZE*sizeof(long); i += sizeof(long) ) { - __get_user(tmp, datap); - putreg(child, i, tmp); - datap++; - } - ret = 0; - break; - } - - case PTRACE_GETFPREGS: { /* Get the child FPU state. */ - if (!access_ok(VERIFY_WRITE, datap, - sizeof(struct user_i387_struct))) { - ret = -EIO; - break; - } - ret = 0; - if (!tsk_used_math(child)) - init_fpu(child); - get_fpregs((struct user_i387_struct __user *)data, child); - break; - } - - case PTRACE_SETFPREGS: { /* Set the child FPU state. */ - if (!access_ok(VERIFY_READ, datap, - sizeof(struct user_i387_struct))) { - ret = -EIO; - break; - } - set_stopped_child_used_math(child); - set_fpregs(child, (struct user_i387_struct __user *)data); - ret = 0; - break; - } - - case PTRACE_GETFPXREGS: { /* Get the child extended FPU state. */ - if (!access_ok(VERIFY_WRITE, datap, - sizeof(struct user_fxsr_struct))) { - ret = -EIO; - break; - } - if (!tsk_used_math(child)) - init_fpu(child); - ret = get_fpxregs((struct user_fxsr_struct __user *)data, child); - break; - } - - case PTRACE_SETFPXREGS: { /* Set the child extended FPU state. */ - if (!access_ok(VERIFY_READ, datap, - sizeof(struct user_fxsr_struct))) { - ret = -EIO; - break; - } - set_stopped_child_used_math(child); - ret = set_fpxregs(child, (struct user_fxsr_struct __user *)data); - break; - } - - case PTRACE_GET_THREAD_AREA: - if (addr < 0) - return -EIO; - ret = do_get_thread_area(child, addr, - (struct user_desc __user *) data); - break; - - case PTRACE_SET_THREAD_AREA: - if (addr < 0) - return -EIO; - ret = do_set_thread_area(child, addr, - (struct user_desc __user *) data, 0); - break; - - default: - ret = ptrace_request(child, request, addr, data); - break; - } - - return ret; -} - -void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, int error_code) -{ - struct siginfo info; - - tsk->thread.trap_no = 1; - tsk->thread.error_code = error_code; - - memset(&info, 0, sizeof(info)); - info.si_signo = SIGTRAP; - info.si_code = TRAP_BRKPT; - - /* User-mode ip? */ - info.si_addr = user_mode_vm(regs) ? (void __user *) regs->ip : NULL; - - /* Send us the fake SIGTRAP */ - force_sig_info(SIGTRAP, &info, tsk); -} - -/* notification of system call entry/exit - * - triggered by current->work.syscall_trace - */ -__attribute__((regparm(3))) -int do_syscall_trace(struct pt_regs *regs, int entryexit) -{ - int is_sysemu = test_thread_flag(TIF_SYSCALL_EMU); - /* - * With TIF_SYSCALL_EMU set we want to ignore TIF_SINGLESTEP for syscall - * interception - */ - int is_singlestep = !is_sysemu && test_thread_flag(TIF_SINGLESTEP); - int ret = 0; - - /* do the secure computing check first */ - if (!entryexit) - secure_computing(regs->orig_ax); - - if (unlikely(current->audit_context)) { - if (entryexit) - audit_syscall_exit(AUDITSC_RESULT(regs->ax), - regs->ax); - /* Debug traps, when using PTRACE_SINGLESTEP, must be sent only - * on the syscall exit path. Normally, when TIF_SYSCALL_AUDIT is - * not used, entry.S will call us only on syscall exit, not - * entry; so when TIF_SYSCALL_AUDIT is used we must avoid - * calling send_sigtrap() on syscall entry. - * - * Note that when PTRACE_SYSEMU_SINGLESTEP is used, - * is_singlestep is false, despite his name, so we will still do - * the correct thing. - */ - else if (is_singlestep) - goto out; - } - - if (!(current->ptrace & PT_PTRACED)) - goto out; - - /* If a process stops on the 1st tracepoint with SYSCALL_TRACE - * and then is resumed with SYSEMU_SINGLESTEP, it will come in - * here. We have to check this and return */ - if (is_sysemu && entryexit) - return 0; - - /* Fake a debug trap */ - if (is_singlestep) - send_sigtrap(current, regs, 0); - - if (!test_thread_flag(TIF_SYSCALL_TRACE) && !is_sysemu) - goto out; - - /* the 0x80 provides a way for the tracing parent to distinguish - between a syscall stop and SIGTRAP delivery */ - /* Note that the debugger could change the result of test_thread_flag!*/ - 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; - } - ret = is_sysemu; -out: - if (unlikely(current->audit_context) && !entryexit) - audit_syscall_entry(AUDIT_ARCH_I386, regs->orig_ax, - regs->bx, regs->cx, regs->dx, regs->si); - if (ret == 0) - return 0; - - regs->orig_ax = -1; /* force skip of syscall restarting */ - if (unlikely(current->audit_context)) - audit_syscall_exit(AUDITSC_RESULT(regs->ax), regs->ax); - return 1; -} -- cgit v1.2.3-18-g5258