11da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* ptrace.c */ 21da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* By Ross Biro 1/23/92 */ 31da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* edited by Linus Torvalds */ 41da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* mangled further by Bob Manson (manson@santafe.edu) */ 51da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* more mutilation by David Mosberger (davidm@azstarnet.com) */ 61da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 71da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/kernel.h> 81da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/sched.h> 91da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/mm.h> 101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/smp.h> 111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/errno.h> 121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/ptrace.h> 131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/user.h> 141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/security.h> 157ed20e1ad521b5f5df61bf6559ae60738e393741Jesper Juhl#include <linux/signal.h> 1612f79be93d94698778ff2b3f921073fc5f6780d6Al Viro#include <linux/tracehook.h> 17a9302e8439445710552886e7b623dbcfa943a1f2蔡正龙#include <linux/audit.h> 181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/uaccess.h> 201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/pgtable.h> 211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/fpu.h> 221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include "proto.h" 241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define DEBUG DBG_MEM 261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#undef DEBUG 271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef DEBUG 291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsenum { 301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds DBG_MEM = (1<<0), 311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds DBG_BPT = (1<<1), 321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds DBG_MEM_ALL = (1<<2) 331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define DBG(fac,args) {if ((fac) & DEBUG) printk args;} 351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#else 361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define DBG(fac,args) 371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define BREAKINST 0x00000080 /* call_pal bpt */ 401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * does not yet catch signals sent when the child dies. 431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * in exit.c or in signal.c. 441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Processes always block with the following stack-layout: 481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * +================================+ <---- task + 2*PAGE_SIZE 501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * | PALcode saved frame (ps, pc, | ^ 511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * | gp, a0, a1, a2) | | 521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * +================================+ | struct pt_regs 531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * | | | 541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * | frame generated by SAVE_ALL | | 551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * | | v 561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * +================================+ 571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * | | ^ 581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * | frame saved by do_switch_stack | | struct switch_stack 591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * | | v 601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * +================================+ 611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * The following table maps a register index into the stack offset at 651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * which the register is saved. Register indices are 0-31 for integer 661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * regs, 32-63 for fp regs, and 64 for the pc. Notice that sp and 671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * zero have no stack-slot and need to be treated specially (see 681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * get_reg/put_reg below). 691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsenum { 711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds REG_R0 = 0, REG_F0 = 32, REG_FPCR = 63, REG_PC = 64 721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 74e52f4ca2a7cfea3495cabae23d48f1538f09ccf2Andrew Morton#define PT_REG(reg) \ 75e52f4ca2a7cfea3495cabae23d48f1538f09ccf2Andrew Morton (PAGE_SIZE*2 - sizeof(struct pt_regs) + offsetof(struct pt_regs, reg)) 76e52f4ca2a7cfea3495cabae23d48f1538f09ccf2Andrew Morton 77e52f4ca2a7cfea3495cabae23d48f1538f09ccf2Andrew Morton#define SW_REG(reg) \ 78e52f4ca2a7cfea3495cabae23d48f1538f09ccf2Andrew Morton (PAGE_SIZE*2 - sizeof(struct pt_regs) - sizeof(struct switch_stack) \ 79e52f4ca2a7cfea3495cabae23d48f1538f09ccf2Andrew Morton + offsetof(struct switch_stack, reg)) 80e52f4ca2a7cfea3495cabae23d48f1538f09ccf2Andrew Morton 811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int regoff[] = { 821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds PT_REG( r0), PT_REG( r1), PT_REG( r2), PT_REG( r3), 831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds PT_REG( r4), PT_REG( r5), PT_REG( r6), PT_REG( r7), 841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds PT_REG( r8), SW_REG( r9), SW_REG( r10), SW_REG( r11), 851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds SW_REG( r12), SW_REG( r13), SW_REG( r14), SW_REG( r15), 861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds PT_REG( r16), PT_REG( r17), PT_REG( r18), PT_REG( r19), 871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds PT_REG( r20), PT_REG( r21), PT_REG( r22), PT_REG( r23), 881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds PT_REG( r24), PT_REG( r25), PT_REG( r26), PT_REG( r27), 891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds PT_REG( r28), PT_REG( gp), -1, -1, 901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds SW_REG(fp[ 0]), SW_REG(fp[ 1]), SW_REG(fp[ 2]), SW_REG(fp[ 3]), 911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds SW_REG(fp[ 4]), SW_REG(fp[ 5]), SW_REG(fp[ 6]), SW_REG(fp[ 7]), 921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds SW_REG(fp[ 8]), SW_REG(fp[ 9]), SW_REG(fp[10]), SW_REG(fp[11]), 931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds SW_REG(fp[12]), SW_REG(fp[13]), SW_REG(fp[14]), SW_REG(fp[15]), 941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds SW_REG(fp[16]), SW_REG(fp[17]), SW_REG(fp[18]), SW_REG(fp[19]), 951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds SW_REG(fp[20]), SW_REG(fp[21]), SW_REG(fp[22]), SW_REG(fp[23]), 961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds SW_REG(fp[24]), SW_REG(fp[25]), SW_REG(fp[26]), SW_REG(fp[27]), 971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds SW_REG(fp[28]), SW_REG(fp[29]), SW_REG(fp[30]), SW_REG(fp[31]), 981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds PT_REG( pc) 991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 1001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic unsigned long zero; 1021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 1041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Get address of register REGNO in task TASK. 1051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 1061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic unsigned long * 1071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsget_reg_addr(struct task_struct * task, unsigned long regno) 1081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long *addr; 1101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (regno == 30) { 11237bfbaf995d2c1f8196ee04c9d6f68258d5ec3e8Al Viro addr = &task_thread_info(task)->pcb.usp; 1131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else if (regno == 65) { 11437bfbaf995d2c1f8196ee04c9d6f68258d5ec3e8Al Viro addr = &task_thread_info(task)->pcb.unique; 1151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else if (regno == 31 || regno > 65) { 1161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds zero = 0; 1171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds addr = &zero; 1181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 11927f451304aa6f2bccf34ef3c2b049c01d05d6fffAl Viro addr = task_stack_page(task) + regoff[regno]; 1201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 1211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return addr; 1221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 1251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Get contents of register REGNO in task TASK. 1261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 1271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic unsigned long 1281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsget_reg(struct task_struct * task, unsigned long regno) 1291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Special hack for fpcr -- combine hardware and software bits. */ 1311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (regno == 63) { 1321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long fpcr = *get_reg_addr(task, regno); 1331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long swcr 13437bfbaf995d2c1f8196ee04c9d6f68258d5ec3e8Al Viro = task_thread_info(task)->ieee_state & IEEE_SW_MASK; 1351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds swcr = swcr_update_status(swcr, fpcr); 1361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return fpcr | swcr; 1371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 1381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return *get_reg_addr(task, regno); 1391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 1421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Write contents of register REGNO in task TASK. 1431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 1441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int 1451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsput_reg(struct task_struct *task, unsigned long regno, unsigned long data) 1461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (regno == 63) { 14837bfbaf995d2c1f8196ee04c9d6f68258d5ec3e8Al Viro task_thread_info(task)->ieee_state 14937bfbaf995d2c1f8196ee04c9d6f68258d5ec3e8Al Viro = ((task_thread_info(task)->ieee_state & ~IEEE_SW_MASK) 1501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds | (data & IEEE_SW_MASK)); 1511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds data = (data & FPCR_DYN_MASK) | ieee_swcr_to_fpcr(data); 1521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 1531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *get_reg_addr(task, regno) = data; 1541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 1551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic inline int 1581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsread_int(struct task_struct *task, unsigned long addr, int * data) 1591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int copied = access_process_vm(task, addr, data, sizeof(int), 0); 1611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return (copied == sizeof(int)) ? 0 : -EIO; 1621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic inline int 1651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldswrite_int(struct task_struct *task, unsigned long addr, int data) 1661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int copied = access_process_vm(task, addr, &data, sizeof(int), 1); 1681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return (copied == sizeof(int)) ? 0 : -EIO; 1691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 1721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Set breakpoint. 1731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 1741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsint 1751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsptrace_set_bpt(struct task_struct * child) 1761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int displ, i, res, reg_b, nsaved = 0; 1781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int insn, op_code; 1791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long pc; 1801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pc = get_reg(child, REG_PC); 1821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds res = read_int(child, pc, (int *) &insn); 1831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (res < 0) 1841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return res; 1851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds op_code = insn >> 26; 1871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (op_code >= 0x30) { 1881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 1891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * It's a branch: instead of trying to figure out 1901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * whether the branch will be taken or not, we'll put 1911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * a breakpoint at either location. This is simpler, 1921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * more reliable, and probably not a whole lot slower 1931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * than the alternative approach of emulating the 1941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * branch (emulation can be tricky for fp branches). 1951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 1961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds displ = ((s32)(insn << 11)) >> 9; 19737bfbaf995d2c1f8196ee04c9d6f68258d5ec3e8Al Viro task_thread_info(child)->bpt_addr[nsaved++] = pc + 4; 1981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (displ) /* guard against unoptimized code */ 19937bfbaf995d2c1f8196ee04c9d6f68258d5ec3e8Al Viro task_thread_info(child)->bpt_addr[nsaved++] 2001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds = pc + 4 + displ; 2011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds DBG(DBG_BPT, ("execing branch\n")); 2021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else if (op_code == 0x1a) { 2031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds reg_b = (insn >> 16) & 0x1f; 20437bfbaf995d2c1f8196ee04c9d6f68258d5ec3e8Al Viro task_thread_info(child)->bpt_addr[nsaved++] = get_reg(child, reg_b); 2051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds DBG(DBG_BPT, ("execing jump\n")); 2061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 20737bfbaf995d2c1f8196ee04c9d6f68258d5ec3e8Al Viro task_thread_info(child)->bpt_addr[nsaved++] = pc + 4; 2081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds DBG(DBG_BPT, ("execing normal insn\n")); 2091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* install breakpoints: */ 2121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (i = 0; i < nsaved; ++i) { 21337bfbaf995d2c1f8196ee04c9d6f68258d5ec3e8Al Viro res = read_int(child, task_thread_info(child)->bpt_addr[i], 2141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds (int *) &insn); 2151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (res < 0) 2161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return res; 21737bfbaf995d2c1f8196ee04c9d6f68258d5ec3e8Al Viro task_thread_info(child)->bpt_insn[i] = insn; 2181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds DBG(DBG_BPT, (" -> next_pc=%lx\n", 21937bfbaf995d2c1f8196ee04c9d6f68258d5ec3e8Al Viro task_thread_info(child)->bpt_addr[i])); 22037bfbaf995d2c1f8196ee04c9d6f68258d5ec3e8Al Viro res = write_int(child, task_thread_info(child)->bpt_addr[i], 2211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds BREAKINST); 2221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (res < 0) 2231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return res; 2241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 22537bfbaf995d2c1f8196ee04c9d6f68258d5ec3e8Al Viro task_thread_info(child)->bpt_nsaved = nsaved; 2261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 2271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 2301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Ensure no single-step breakpoint is pending. Returns non-zero 2311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * value if child was being single-stepped. 2321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 2331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsint 2341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsptrace_cancel_bpt(struct task_struct * child) 2351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 23637bfbaf995d2c1f8196ee04c9d6f68258d5ec3e8Al Viro int i, nsaved = task_thread_info(child)->bpt_nsaved; 2371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 23837bfbaf995d2c1f8196ee04c9d6f68258d5ec3e8Al Viro task_thread_info(child)->bpt_nsaved = 0; 2391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (nsaved > 2) { 2411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk("ptrace_cancel_bpt: bogus nsaved: %d!\n", nsaved); 2421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds nsaved = 2; 2431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (i = 0; i < nsaved; ++i) { 24637bfbaf995d2c1f8196ee04c9d6f68258d5ec3e8Al Viro write_int(child, task_thread_info(child)->bpt_addr[i], 24737bfbaf995d2c1f8196ee04c9d6f68258d5ec3e8Al Viro task_thread_info(child)->bpt_insn[i]); 2481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return (nsaved != 0); 2501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 252fd341abba65e3d93fc24c132e4c0278d18b6d2fcChristoph Hellwigvoid user_enable_single_step(struct task_struct *child) 253fd341abba65e3d93fc24c132e4c0278d18b6d2fcChristoph Hellwig{ 254fd341abba65e3d93fc24c132e4c0278d18b6d2fcChristoph Hellwig /* Mark single stepping. */ 255fd341abba65e3d93fc24c132e4c0278d18b6d2fcChristoph Hellwig task_thread_info(child)->bpt_nsaved = -1; 256fd341abba65e3d93fc24c132e4c0278d18b6d2fcChristoph Hellwig} 257fd341abba65e3d93fc24c132e4c0278d18b6d2fcChristoph Hellwig 258fd341abba65e3d93fc24c132e4c0278d18b6d2fcChristoph Hellwigvoid user_disable_single_step(struct task_struct *child) 259fd341abba65e3d93fc24c132e4c0278d18b6d2fcChristoph Hellwig{ 260fd341abba65e3d93fc24c132e4c0278d18b6d2fcChristoph Hellwig ptrace_cancel_bpt(child); 261fd341abba65e3d93fc24c132e4c0278d18b6d2fcChristoph Hellwig} 262fd341abba65e3d93fc24c132e4c0278d18b6d2fcChristoph Hellwig 2631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 2641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Called by kernel/ptrace.c when detaching.. 2651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 2661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Make sure the single step bit is not set. 2671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 2681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsvoid ptrace_disable(struct task_struct *child) 2691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 270fd341abba65e3d93fc24c132e4c0278d18b6d2fcChristoph Hellwig user_disable_single_step(child); 2711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2739b05a69e0534ec70bc94921936ffa05b330507cbNamhyung Kimlong arch_ptrace(struct task_struct *child, long request, 2749b05a69e0534ec70bc94921936ffa05b330507cbNamhyung Kim unsigned long addr, unsigned long data) 2751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long tmp; 2771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size_t copied; 2781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds long ret; 2791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds switch (request) { 2811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* When I and D space are separate, these will need to be fixed. */ 2821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case PTRACE_PEEKTEXT: /* read word at location addr. */ 2831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case PTRACE_PEEKDATA: 2841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0); 2851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ret = -EIO; 2861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (copied != sizeof(tmp)) 2871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 2881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 289a5f833f3c1961488733bf645b011b6350ee5c7beChristoph Hellwig force_successful_syscall_return(); 2901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ret = tmp; 2911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 2921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Read register number ADDR. */ 2941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case PTRACE_PEEKUSR: 295a5f833f3c1961488733bf645b011b6350ee5c7beChristoph Hellwig force_successful_syscall_return(); 2961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ret = get_reg(child, addr); 2979b05a69e0534ec70bc94921936ffa05b330507cbNamhyung Kim DBG(DBG_MEM, ("peek $%lu->%#lx\n", addr, ret)); 2981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 2991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* When I and D space are separate, this will have to be fixed. */ 3011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case PTRACE_POKETEXT: /* write the word at location addr. */ 3021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case PTRACE_POKEDATA: 303f284ce7269031947326bac6bb19a977705276222Alexey Dobriyan ret = generic_ptrace_pokedata(child, addr, data); 3041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 3051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case PTRACE_POKEUSR: /* write the specified register */ 3079b05a69e0534ec70bc94921936ffa05b330507cbNamhyung Kim DBG(DBG_MEM, ("poke $%lu<-%#lx\n", addr, data)); 3081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ret = put_reg(child, addr, data); 3091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 3101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds default: 3111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ret = ptrace_request(child, request, addr, data); 312a5f833f3c1961488733bf645b011b6350ee5c7beChristoph Hellwig break; 3131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return ret; 3151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 31712f79be93d94698778ff2b3f921073fc5f6780d6Al Viroasmlinkage unsigned long syscall_trace_enter(void) 31812f79be93d94698778ff2b3f921073fc5f6780d6Al Viro{ 31912f79be93d94698778ff2b3f921073fc5f6780d6Al Viro unsigned long ret = 0; 320a9302e8439445710552886e7b623dbcfa943a1f2蔡正龙 struct pt_regs *regs = current_pt_regs(); 32112f79be93d94698778ff2b3f921073fc5f6780d6Al Viro if (test_thread_flag(TIF_SYSCALL_TRACE) && 32212f79be93d94698778ff2b3f921073fc5f6780d6Al Viro tracehook_report_syscall_entry(current_pt_regs())) 32312f79be93d94698778ff2b3f921073fc5f6780d6Al Viro ret = -1UL; 32491397401bb5072f71e8ce8744ad0bdec3e875a91Eric Paris audit_syscall_entry(regs->r0, regs->r16, regs->r17, regs->r18, regs->r19); 32512f79be93d94698778ff2b3f921073fc5f6780d6Al Viro return ret ?: current_pt_regs()->r0; 32612f79be93d94698778ff2b3f921073fc5f6780d6Al Viro} 32712f79be93d94698778ff2b3f921073fc5f6780d6Al Viro 3281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsasmlinkage void 32912f79be93d94698778ff2b3f921073fc5f6780d6Al Virosyscall_trace_leave(void) 3301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 331a9302e8439445710552886e7b623dbcfa943a1f2蔡正龙 audit_syscall_exit(current_pt_regs()); 33212f79be93d94698778ff2b3f921073fc5f6780d6Al Viro if (test_thread_flag(TIF_SYSCALL_TRACE)) 33312f79be93d94698778ff2b3f921073fc5f6780d6Al Viro tracehook_report_syscall_exit(current_pt_regs(), 0); 3341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 335