2 * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
3 * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
4 * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
5 * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
6 * Copyright (c) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
7 * Linux for s390 port by D.J. Barrow
8 * <barrow_dj@mail.yahoo.com,djbarrow@de.ibm.com>
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. The name of the author may not be used to endorse or promote products
20 * derived from this software without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 #include <sys/param.h>
43 # include <asm/ptrace_offsets.h>
49 # define PTRACE_PEEKUSR PTRACE_PEEKUSER
50 #elif defined(HAVE_LINUX_PTRACE_H)
51 # undef PTRACE_SYSCALL
52 # ifdef HAVE_STRUCT_IA64_FPREG
53 # define ia64_fpreg XXX_ia64_fpreg
55 # ifdef HAVE_STRUCT_PT_ALL_USER_REGS
56 # define pt_all_user_regs XXX_pt_all_user_regs
58 # include <linux/ptrace.h>
60 # undef pt_all_user_regs
65 # define MAX(a,b) (((a) > (b)) ? (a) : (b))
68 # define MIN(a,b) (((a) < (b)) ? (a) : (b))
72 string_to_uint(const char *str)
80 value = strtol(str, &error, 10);
81 if (errno || *error || value < 0 || (long)(int)value != value)
87 tv_nz(struct timeval *a)
89 return a->tv_sec || a->tv_usec;
93 tv_cmp(struct timeval *a, struct timeval *b)
95 if (a->tv_sec < b->tv_sec
96 || (a->tv_sec == b->tv_sec && a->tv_usec < b->tv_usec))
98 if (a->tv_sec > b->tv_sec
99 || (a->tv_sec == b->tv_sec && a->tv_usec > b->tv_usec))
105 tv_float(struct timeval *tv)
107 return tv->tv_sec + tv->tv_usec/1000000.0;
111 tv_add(struct timeval *tv, struct timeval *a, struct timeval *b)
113 tv->tv_sec = a->tv_sec + b->tv_sec;
114 tv->tv_usec = a->tv_usec + b->tv_usec;
115 if (tv->tv_usec >= 1000000) {
117 tv->tv_usec -= 1000000;
122 tv_sub(struct timeval *tv, struct timeval *a, struct timeval *b)
124 tv->tv_sec = a->tv_sec - b->tv_sec;
125 tv->tv_usec = a->tv_usec - b->tv_usec;
126 if (((long) tv->tv_usec) < 0) {
128 tv->tv_usec += 1000000;
133 tv_div(struct timeval *tv, struct timeval *a, int n)
135 tv->tv_usec = (a->tv_sec % n * 1000000 + a->tv_usec + n / 2) / n;
136 tv->tv_sec = a->tv_sec / n + tv->tv_usec / 1000000;
137 tv->tv_usec %= 1000000;
141 tv_mul(struct timeval *tv, struct timeval *a, int n)
143 tv->tv_usec = a->tv_usec * n;
144 tv->tv_sec = a->tv_sec * n + tv->tv_usec / 1000000;
145 tv->tv_usec %= 1000000;
149 xlookup(const struct xlat *xlat, int val)
151 for (; xlat->str != NULL; xlat++)
152 if (xlat->val == val)
157 #if !defined HAVE_STPCPY
159 stpcpy(char *dst, const char *src)
161 while ((*dst = *src++) != '\0')
168 * Print entry in struct xlat table, if there.
171 printxval(const struct xlat *xlat, int val, const char *dflt)
173 const char *str = xlookup(xlat, val);
178 tprintf("%#x /* %s */", val, dflt);
182 * Print 64bit argument at position llarg and return the index of the next
186 printllval(struct tcb *tcp, const char *format, int llarg)
188 #if defined(X86_64) || defined(POWERPC64)
189 if (current_personality == 0) {
190 /* Technically, format expects "long long",
191 * but we supply "long". We expect that
192 * on this arch, they are the same.
194 tprintf(format, tcp->u_arg[llarg]);
198 /* Align 64bit argument to 64bit boundary. */
199 llarg = (llarg + 1) & 0x1e;
201 tprintf(format, LONG_LONG(tcp->u_arg[llarg], tcp->u_arg[llarg + 1]));
204 #elif defined IA64 || defined ALPHA
205 /* Technically, format expects "long long",
206 * but we supply "long". We expect that
207 * on this arch, they are the same.
209 tprintf(format, tcp->u_arg[llarg]);
211 #elif defined LINUX_MIPSN32 || defined X32
212 tprintf(format, tcp->ext_arg[llarg]);
216 # error BUG: must not combine two args for long long on this arch
218 tprintf(format, LONG_LONG(tcp->u_arg[llarg], tcp->u_arg[llarg + 1]));
225 * Interpret `xlat' as an array of flags
226 * print the entries whose bits are on in `flags'
227 * return # of flags printed.
230 addflags(const struct xlat *xlat, int flags)
232 for (; xlat->str; xlat++) {
233 if (xlat->val && (flags & xlat->val) == xlat->val) {
234 tprintf("|%s", xlat->str);
239 tprintf("|%#x", flags);
244 * Interpret `xlat' as an array of flags.
245 * Print to static string the entries whose bits are on in `flags'
246 * Return static string.
249 sprintflags(const char *prefix, const struct xlat *xlat, int flags)
251 static char outstr[1024];
255 outptr = stpcpy(outstr, prefix);
257 for (; xlat->str; xlat++) {
258 if ((flags & xlat->val) == xlat->val) {
261 outptr = stpcpy(outptr, xlat->str);
271 outptr += sprintf(outptr, "%#x", flags);
278 printflags(const struct xlat *xlat, int flags, const char *dflt)
283 if (flags == 0 && xlat->val == 0) {
289 for (n = 0; xlat->str; xlat++) {
290 if (xlat->val && (flags & xlat->val) == xlat->val) {
291 tprintf("%s%s", sep, xlat->str);
300 tprintf("%s%#x", sep, flags);
305 tprintf("%#x", flags);
307 tprintf(" /* %s */", dflt);
318 printnum(struct tcb *tcp, long addr, const char *fmt)
326 if (umove(tcp, addr, &num) < 0) {
327 tprintf("%#lx", addr);
336 printnum_int(struct tcb *tcp, long addr, const char *fmt)
344 if (umove(tcp, addr, &num) < 0) {
345 tprintf("%#lx", addr);
354 printfd(struct tcb *tcp, int fd)
358 if (show_fd_path && (p = getfdpath(tcp, fd)))
359 tprintf("%d<%s>", fd, p);
365 printuid(const char *text, unsigned long uid)
367 tprintf((uid == -1) ? "%s%ld" : "%s%lu", text, uid);
371 * Quote string `instr' of length `size'
372 * Write up to (3 + `size' * 4) bytes to `outstr' buffer.
373 * If `len' is -1, treat `instr' as a NUL-terminated string
374 * and quote at most (`size' - 1) bytes.
376 * Returns 0 if len == -1 and NUL was seen, 1 otherwise.
377 * Note that if len >= 0, always returns 1.
380 string_quote(const char *instr, char *outstr, long len, int size)
382 const unsigned char *ustr = (const unsigned char *) instr;
384 int usehex, c, i, eol;
386 eol = 0x100; /* this can never match a char */
396 /* Check for presence of symbol which require
397 to hex-quote the whole string. */
398 for (i = 0; i < size; ++i) {
400 /* Check for NUL-terminated string. */
403 if (!isprint(c) && !isspace(c)) {
413 /* Hex-quote the whole string. */
414 for (i = 0; i < size; ++i) {
416 /* Check for NUL-terminated string. */
421 *s++ = "0123456789abcdef"[c >> 4];
422 *s++ = "0123456789abcdef"[c & 0xf];
425 for (i = 0; i < size; ++i) {
427 /* Check for NUL-terminated string. */
431 case '\"': case '\\':
462 && ustr[i + 1] >= '0'
463 && ustr[i + 1] <= '9'
466 *s++ = '0' + (c >> 6);
467 *s++ = '0' + ((c >> 3) & 0x7);
472 *s++ = '0' + (c >> 6);
473 *s++ = '0' + ((c >> 3) & 0x7);
476 *s++ = '0' + (c & 0x7);
486 /* Return zero if we printed entire ASCIZ string (didn't truncate it) */
487 if (len == -1 && ustr[i] == '\0') {
488 /* We didn't see NUL yet (otherwise we'd jump to 'asciz_ended')
489 * but next char is NUL.
499 /* Return zero: we printed entire ASCIZ string (didn't truncate it) */
504 * Print path string specified by address `addr' and length `n'.
505 * If path length exceeds `n', append `...' to the output.
508 printpathn(struct tcb *tcp, long addr, int n)
510 char path[MAXPATHLEN + 1];
518 /* Cap path length to the path buffer size */
519 if (n > sizeof path - 1)
522 /* Fetch one byte more to find out whether path length > n. */
523 nul_seen = umovestr(tcp, addr, n + 1, path);
525 tprintf("%#lx", addr);
531 outstr = alloca(4 * n); /* 4*(n-1) + 3 for quotes and NUL */
532 string_quote(path, outstr, -1, n);
540 printpath(struct tcb *tcp, long addr)
542 /* Size must correspond to char path[] size in printpathn */
543 printpathn(tcp, addr, MAXPATHLEN);
547 * Print string specified by address `addr' and length `len'.
548 * If `len' < 0, treat the string as a NUL-terminated string.
549 * If string length exceeds `max_strlen', append `...' to the output.
552 printstr(struct tcb *tcp, long addr, long len)
554 static char *str = NULL;
563 /* Allocate static buffers if they are not allocated yet. */
565 unsigned int outstr_size = 4 * max_strlen + /*for quotes and NUL:*/ 3;
567 if (outstr_size / 4 != max_strlen)
569 str = malloc(max_strlen + 1);
572 outstr = malloc(outstr_size);
579 * Treat as a NUL-terminated string: fetch one byte more
580 * because string_quote() quotes one byte less.
582 size = max_strlen + 1;
583 if (umovestr(tcp, addr, size, str) < 0) {
584 tprintf("%#lx", addr);
590 if (size > (unsigned long)len)
591 size = (unsigned long)len;
592 if (umoven(tcp, addr, size, str) < 0) {
593 tprintf("%#lx", addr);
598 /* If string_quote didn't see NUL and (it was supposed to be ASCIZ str
599 * or we were requested to print more than -s NUM chars)...
601 ellipsis = (string_quote(str, outstr, len, size) &&
602 (len < 0 || len > max_strlen));
611 dumpiov(struct tcb *tcp, int len, long addr)
613 #if SUPPORTED_PERSONALITIES > 1
615 struct { u_int32_t base; u_int32_t len; } *iov32;
616 struct { u_int64_t base; u_int64_t len; } *iov64;
618 #define iov iovu.iov64
620 (current_wordsize == 4 ? sizeof(*iovu.iov32) : sizeof(*iovu.iov64))
621 #define iov_iov_base(i) \
622 (current_wordsize == 4 ? (uint64_t) iovu.iov32[i].base : iovu.iov64[i].base)
623 #define iov_iov_len(i) \
624 (current_wordsize == 4 ? (uint64_t) iovu.iov32[i].len : iovu.iov64[i].len)
627 #define sizeof_iov sizeof(*iov)
628 #define iov_iov_base(i) iov[i].iov_base
629 #define iov_iov_len(i) iov[i].iov_len
634 size = sizeof_iov * len;
635 /* Assuming no sane program has millions of iovs */
636 if ((unsigned)len > 1024*1024 /* insane or negative size? */
637 || (iov = malloc(size)) == NULL) {
638 fprintf(stderr, "Out of memory\n");
641 if (umoven(tcp, addr, size, (char *) iov) >= 0) {
642 for (i = 0; i < len; i++) {
643 /* include the buffer number to make it easy to
644 * match up the trace with the source */
645 tprintf(" * %lu bytes in buffer %d\n",
646 (unsigned long)iov_iov_len(i), i);
647 dumpstr(tcp, (long) iov_iov_base(i),
660 dumpstr(struct tcb *tcp, long addr, int len)
662 static int strsize = -1;
663 static unsigned char *str;
668 "xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx "
669 "1234567890123456") + /*in case I'm off by few:*/ 4)
670 /*align to 8 to make memset easier:*/ + 7) & -8
672 const unsigned char *src;
675 memset(outbuf, ' ', sizeof(outbuf));
677 if (strsize < len + 16) {
679 str = malloc(len + 16);
682 fprintf(stderr, "Out of memory\n");
688 if (umoven(tcp, addr, len, (char *) str) < 0)
691 /* Space-pad to 16 bytes */
703 *dst++ = "0123456789abcdef"[*src >> 4];
704 *dst++ = "0123456789abcdef"[*src & 0xf];
710 dst++; /* space is there by memset */
713 dst++; /* space is there by memset */
720 if (*src >= ' ' && *src < 0x7f)
727 tprintf(" | %05x %s |\n", i, outbuf);
731 #ifdef HAVE_PROCESS_VM_READV
732 /* C library supports this, but the kernel might not. */
733 static bool process_vm_readv_not_supported = 0;
736 /* Need to do this since process_vm_readv() is not yet available in libc.
737 * When libc is be updated, only "static bool process_vm_readv_not_supported"
738 * line should remain.
740 #if !defined(__NR_process_vm_readv)
742 # define __NR_process_vm_readv 347
743 # elif defined(X86_64)
744 # define __NR_process_vm_readv 310
745 # elif defined(POWERPC)
746 # define __NR_process_vm_readv 351
750 #if defined(__NR_process_vm_readv)
751 static bool process_vm_readv_not_supported = 0;
752 /* Have to avoid duplicating with the C library headers. */
753 static ssize_t strace_process_vm_readv(pid_t pid,
754 const struct iovec *lvec,
755 unsigned long liovcnt,
756 const struct iovec *rvec,
757 unsigned long riovcnt,
760 return syscall(__NR_process_vm_readv, (long)pid, lvec, liovcnt, rvec, riovcnt, flags);
762 #define process_vm_readv strace_process_vm_readv
764 static bool process_vm_readv_not_supported = 1;
765 # define process_vm_readv(...) (errno = ENOSYS, -1)
768 #endif /* end of hack */
770 #define PAGMASK (~(PAGSIZ - 1))
772 * move `len' bytes of data from process `pid'
773 * at address `addr' to our space at `laddr'
776 umoven(struct tcb *tcp, long addr, int len, char *laddr)
783 char x[sizeof(long)];
786 #if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
787 if (current_wordsize < sizeof(addr))
788 addr &= (1ul << 8 * current_wordsize) - 1;
791 if (!process_vm_readv_not_supported) {
792 struct iovec local[1], remote[1];
795 local[0].iov_base = laddr;
796 remote[0].iov_base = (void*)addr;
797 local[0].iov_len = remote[0].iov_len = len;
798 r = process_vm_readv(pid,
805 process_vm_readv_not_supported = 1;
806 else if (errno != EINVAL && errno != ESRCH)
807 /* EINVAL or ESRCH could be seen if process is gone,
808 * all the rest is strange and should be reported. */
809 perror_msg("%s", "process_vm_readv");
810 goto vm_readv_didnt_work;
817 if (addr & (sizeof(long) - 1)) {
818 /* addr not a multiple of sizeof(long) */
819 n = addr - (addr & -sizeof(long)); /* residue */
820 addr &= -sizeof(long); /* residue */
822 u.val = ptrace(PTRACE_PEEKDATA, pid, (char *) addr, 0);
824 /* But if not started, we had a bogus address. */
825 if (addr != 0 && errno != EIO && errno != ESRCH)
826 perror_msg("umoven: PTRACE_PEEKDATA pid:%d @0x%lx", pid, addr);
830 m = MIN(sizeof(long) - n, len);
831 memcpy(laddr, &u.x[n], m);
832 addr += sizeof(long), laddr += m, len -= m;
836 u.val = ptrace(PTRACE_PEEKDATA, pid, (char *) addr, 0);
838 if (started && (errno==EPERM || errno==EIO)) {
839 /* Ran into 'end of memory' - stupid "printpath" */
842 if (addr != 0 && errno != EIO && errno != ESRCH)
843 perror_msg("umoven: PTRACE_PEEKDATA pid:%d @0x%lx", pid, addr);
847 m = MIN(sizeof(long), len);
848 memcpy(laddr, u.x, m);
849 addr += sizeof(long), laddr += m, len -= m;
856 * Like `umove' but make the additional effort of looking
857 * for a terminating zero byte.
859 * Returns < 0 on error, > 0 if NUL was seen,
860 * (TODO if useful: return count of bytes including NUL),
861 * else 0 if len bytes were read but no NUL byte seen.
863 * Note: there is no guarantee we won't overwrite some bytes
864 * in laddr[] _after_ terminating NUL (but, of course,
865 * we never write past laddr[len-1]).
868 umovestr(struct tcb *tcp, long addr, int len, char *laddr)
875 char x[sizeof(long)];
878 #if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
879 if (current_wordsize < sizeof(addr))
880 addr &= (1ul << 8 * current_wordsize) - 1;
883 if (!process_vm_readv_not_supported) {
884 struct iovec local[1], remote[1];
886 local[0].iov_base = laddr;
887 remote[0].iov_base = (void*)addr;
894 /* Don't read kilobytes: most strings are short */
898 /* Don't cross pages. I guess otherwise we can get EFAULT
899 * and fail to notice that terminating NUL lies
900 * in the existing (first) page.
901 * (I hope there aren't arches with pages < 4K)
903 end_in_page = ((addr + chunk_len) & 4095);
904 r = chunk_len - end_in_page;
905 if (r > 0) /* if chunk_len > end_in_page */
906 chunk_len = r; /* chunk_len -= end_in_page */
908 local[0].iov_len = remote[0].iov_len = chunk_len;
909 r = process_vm_readv(pid,
916 process_vm_readv_not_supported = 1;
917 else if (errno != EINVAL && errno != ESRCH)
918 /* EINVAL or ESRCH could be seen
919 * if process is gone, all the rest
920 * is strange and should be reported. */
921 perror_msg("%s", "process_vm_readv");
922 goto vm_readv_didnt_work;
924 if (memchr(local[0].iov_base, '\0', r))
926 local[0].iov_base += r;
927 remote[0].iov_base += r;
935 if (addr & (sizeof(long) - 1)) {
936 /* addr not a multiple of sizeof(long) */
937 n = addr - (addr & -sizeof(long)); /* residue */
938 addr &= -sizeof(long); /* residue */
940 u.val = ptrace(PTRACE_PEEKDATA, pid, (char *)addr, 0);
942 if (addr != 0 && errno != EIO && errno != ESRCH)
943 perror_msg("umovestr: PTRACE_PEEKDATA pid:%d @0x%lx", pid, addr);
947 m = MIN(sizeof(long) - n, len);
948 memcpy(laddr, &u.x[n], m);
949 while (n & (sizeof(long) - 1))
950 if (u.x[n++] == '\0')
952 addr += sizeof(long), laddr += m, len -= m;
956 u.val = ptrace(PTRACE_PEEKDATA, pid, (char *)addr, 0);
958 if (started && (errno==EPERM || errno==EIO)) {
959 /* Ran into 'end of memory' - stupid "printpath" */
962 if (addr != 0 && errno != EIO && errno != ESRCH)
963 perror_msg("umovestr: PTRACE_PEEKDATA pid:%d @0x%lx", pid, addr);
967 m = MIN(sizeof(long), len);
968 memcpy(laddr, u.x, m);
969 for (i = 0; i < sizeof(long); i++)
972 addr += sizeof(long), laddr += m, len -= m;
978 upeek(struct tcb *tcp, long off, long *res)
983 val = ptrace(PTRACE_PEEKUSER, tcp->pid, (char *) off, 0);
984 if (val == -1 && errno) {
985 if (errno != ESRCH) {
986 perror_msg("upeek: PTRACE_PEEKUSER pid:%d @0x%lx)", tcp->pid, off);
994 /* Note! On new kernels (about 2.5.46+), we use PTRACE_O_TRACECLONE
995 * and PTRACE_O_TRACE[V]FORK for tracing children.
996 * If you are adding a new arch which is only supported by newer kernels,
997 * you most likely don't need to add any code below
998 * beside a dummy "return 0" block in change_syscall().
1002 * These #if's are huge, please indent them correctly.
1003 * It's easy to get confused otherwise.
1006 #include "syscall.h"
1008 #ifndef CLONE_PTRACE
1009 # define CLONE_PTRACE 0x00002000
1012 # define CLONE_VFORK 0x00004000
1015 # define CLONE_VM 0x00000100
1020 typedef unsigned long *arg_setup_state;
1023 arg_setup(struct tcb *tcp, arg_setup_state *state)
1025 unsigned long cfm, sof, sol;
1029 /* Satisfy a false GCC warning. */
1034 if (upeek(tcp, PT_AR_BSP, &bsp) < 0)
1036 if (upeek(tcp, PT_CFM, (long *) &cfm) < 0)
1039 sof = (cfm >> 0) & 0x7f;
1040 sol = (cfm >> 7) & 0x7f;
1041 bsp = (long) ia64_rse_skip_regs((unsigned long *) bsp, -sof + sol);
1043 *state = (unsigned long *) bsp;
1047 # define arg_finish_change(tcp, state) 0
1050 get_arg0(struct tcb *tcp, arg_setup_state *state, long *valp)
1055 ret = upeek(tcp, PT_R11, valp);
1058 (unsigned long) ia64_rse_skip_regs(*state, 0),
1059 sizeof(long), (void *) valp);
1064 get_arg1(struct tcb *tcp, arg_setup_state *state, long *valp)
1069 ret = upeek(tcp, PT_R9, valp);
1072 (unsigned long) ia64_rse_skip_regs(*state, 1),
1073 sizeof(long), (void *) valp);
1078 set_arg0(struct tcb *tcp, arg_setup_state *state, long val)
1080 int req = PTRACE_POKEDATA;
1084 ap = (void *) (intptr_t) PT_R11; /* r11 == EBX */
1085 req = PTRACE_POKEUSER;
1087 ap = ia64_rse_skip_regs(*state, 0);
1089 ptrace(req, tcp->pid, ap, val);
1090 return errno ? -1 : 0;
1094 set_arg1(struct tcb *tcp, arg_setup_state *state, long val)
1096 int req = PTRACE_POKEDATA;
1100 ap = (void *) (intptr_t) PT_R9; /* r9 == ECX */
1101 req = PTRACE_POKEUSER;
1103 ap = ia64_rse_skip_regs(*state, 1);
1105 ptrace(req, tcp->pid, ap, val);
1106 return errno ? -1 : 0;
1109 /* ia64 does not return the input arguments from functions (and syscalls)
1110 according to ia64 RSE (Register Stack Engine) behavior. */
1112 # define restore_arg0(tcp, state, val) ((void) (state), 0)
1113 # define restore_arg1(tcp, state, val) ((void) (state), 0)
1115 #elif defined(SPARC) || defined(SPARC64)
1117 # if defined(SPARC64)
1118 # undef PTRACE_GETREGS
1119 # define PTRACE_GETREGS PTRACE_GETREGS64
1120 # undef PTRACE_SETREGS
1121 # define PTRACE_SETREGS PTRACE_SETREGS64
1124 typedef struct pt_regs arg_setup_state;
1126 # define arg_setup(tcp, state) \
1127 (ptrace(PTRACE_GETREGS, (tcp)->pid, (char *) (state), 0))
1128 # define arg_finish_change(tcp, state) \
1129 (ptrace(PTRACE_SETREGS, (tcp)->pid, (char *) (state), 0))
1131 # define get_arg0(tcp, state, valp) (*(valp) = (state)->u_regs[U_REG_O0], 0)
1132 # define get_arg1(tcp, state, valp) (*(valp) = (state)->u_regs[U_REG_O1], 0)
1133 # define set_arg0(tcp, state, val) ((state)->u_regs[U_REG_O0] = (val), 0)
1134 # define set_arg1(tcp, state, val) ((state)->u_regs[U_REG_O1] = (val), 0)
1135 # define restore_arg0(tcp, state, val) 0
1137 #else /* other architectures */
1139 # if defined S390 || defined S390X
1140 /* Note: this is only true for the `clone' system call, which handles
1141 arguments specially. We could as well say that its first two arguments
1142 are swapped relative to other architectures, but that would just be
1143 another #ifdef in the calls. */
1144 # define arg0_offset PT_GPR3
1145 # define arg1_offset PT_ORIGGPR2
1146 # define restore_arg0(tcp, state, val) ((void) (state), 0)
1147 # define restore_arg1(tcp, state, val) ((void) (state), 0)
1148 # define arg0_index 1
1149 # define arg1_index 0
1150 # elif defined(ALPHA) || defined(MIPS)
1151 # define arg0_offset REG_A0
1152 # define arg1_offset (REG_A0+1)
1153 # elif defined(POWERPC)
1154 # define arg0_offset (sizeof(unsigned long)*PT_R3)
1155 # define arg1_offset (sizeof(unsigned long)*PT_R4)
1156 # define restore_arg0(tcp, state, val) ((void) (state), 0)
1157 # elif defined(HPPA)
1158 # define arg0_offset PT_GR26
1159 # define arg1_offset (PT_GR26-4)
1160 # elif defined(X86_64) || defined(X32)
1161 # define arg0_offset ((long)(8*(current_personality ? RBX : RDI)))
1162 # define arg1_offset ((long)(8*(current_personality ? RCX : RSI)))
1164 # define arg0_offset (4*(REG_REG0+4))
1165 # define arg1_offset (4*(REG_REG0+5))
1166 # elif defined(SH64)
1167 /* ABI defines arg0 & 1 in r2 & r3 */
1168 # define arg0_offset (REG_OFFSET+16)
1169 # define arg1_offset (REG_OFFSET+24)
1170 # define restore_arg0(tcp, state, val) 0
1171 # elif defined CRISV10 || defined CRISV32
1172 # define arg0_offset (4*PT_R11)
1173 # define arg1_offset (4*PT_ORIG_R10)
1174 # define restore_arg0(tcp, state, val) 0
1175 # define restore_arg1(tcp, state, val) 0
1176 # define arg0_index 1
1177 # define arg1_index 0
1179 # define arg0_offset 0
1180 # define arg1_offset 4
1182 # define restore_arg0(tcp, state, val) 0
1186 typedef int arg_setup_state;
1188 # define arg_setup(tcp, state) (0)
1189 # define arg_finish_change(tcp, state) 0
1190 # define get_arg0(tcp, cookie, valp) (upeek((tcp), arg0_offset, (valp)))
1191 # define get_arg1(tcp, cookie, valp) (upeek((tcp), arg1_offset, (valp)))
1194 set_arg0(struct tcb *tcp, void *cookie, long val)
1196 return ptrace(PTRACE_POKEUSER, tcp->pid, (char*)arg0_offset, val);
1200 set_arg1(struct tcb *tcp, void *cookie, long val)
1202 return ptrace(PTRACE_POKEUSER, tcp->pid, (char*)arg1_offset, val);
1205 #endif /* architectures */
1207 #ifndef restore_arg0
1208 # define restore_arg0(tcp, state, val) set_arg0((tcp), (state), (val))
1210 #ifndef restore_arg1
1211 # define restore_arg1(tcp, state, val) set_arg1((tcp), (state), (val))
1215 # define arg0_index 0
1216 # define arg1_index 1
1220 change_syscall(struct tcb *tcp, arg_setup_state *state, int new)
1223 if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(ORIG_EAX * 4), new) < 0)
1226 #elif defined(X86_64)
1227 if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(ORIG_RAX * 8), new) < 0)
1231 /* setbpt/clearbpt never used: */
1232 /* X32 is only supported since about linux-3.0.30 */
1233 #elif defined(POWERPC)
1234 if (ptrace(PTRACE_POKEUSER, tcp->pid,
1235 (char*)(sizeof(unsigned long)*PT_R0), new) < 0)
1238 #elif defined(S390) || defined(S390X)
1239 /* s390 linux after 2.4.7 has a hook in entry.S to allow this */
1240 if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(PT_GPR2), new) < 0)
1244 if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(4*PT_ORIG_D0), new) < 0)
1247 #elif defined(SPARC) || defined(SPARC64)
1248 state->u_regs[U_REG_G1] = new;
1251 if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(REG_V0), new) < 0)
1254 #elif defined(ALPHA)
1255 if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(REG_A3), new) < 0)
1258 #elif defined(AVR32)
1259 /* setbpt/clearbpt never used: */
1260 /* AVR32 is only supported since about linux-2.6.19 */
1262 /* setbpt/clearbpt never used: */
1263 /* Blackfin is only supported since about linux-2.6.23 */
1268 break; /* x86 SYS_fork */
1273 fprintf(stderr, "%s: unexpected syscall %d\n",
1277 if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(PT_R1), new) < 0)
1279 } else if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(PT_R15), new) < 0)
1283 if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(PT_GR20), new) < 0)
1287 if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(4*(REG_REG0+3)), new) < 0)
1291 /* Top half of reg encodes the no. of args n as 0x1n.
1292 Assume 0 args as kernel never actually checks... */
1293 if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(REG_SYSCALL),
1294 0x100000 | new) < 0)
1297 #elif defined(CRISV10) || defined(CRISV32)
1298 if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(4*PT_R9), new) < 0)
1302 /* Some kernels support this, some (pre-2.6.16 or so) don't. */
1303 # ifndef PTRACE_SET_SYSCALL
1304 # define PTRACE_SET_SYSCALL 23
1306 if (ptrace(PTRACE_SET_SYSCALL, tcp->pid, 0, new & 0xffff) != 0)
1309 #elif defined(AARCH64)
1310 /* setbpt/clearbpt never used: */
1311 /* AARCH64 is only supported since about linux-3.0.31 */
1313 /* setbpt/clearbpt never used: */
1314 /* Tilera CPUs are only supported since about linux-2.6.34 */
1315 #elif defined(MICROBLAZE)
1316 /* setbpt/clearbpt never used: */
1317 /* microblaze is only supported since about linux-2.6.30 */
1319 /* never reached; OR1K is only supported by kernels since 3.1.0. */
1321 #warning Do not know how to handle change_syscall for this architecture
1322 #endif /* architecture */
1327 setbpt(struct tcb *tcp)
1329 static int clone_scno[SUPPORTED_PERSONALITIES] = { SYS_clone };
1330 arg_setup_state state;
1332 if (tcp->flags & TCB_BPTSET) {
1333 fprintf(stderr, "PANIC: TCB already set in pid %u\n", tcp->pid);
1338 * It's a silly kludge to initialize this with a search at runtime.
1339 * But it's better than maintaining another magic thing in the
1340 * godforsaken tables.
1342 if (clone_scno[current_personality] == 0) {
1344 for (i = 0; i < nsyscalls; ++i)
1345 if (sysent[i].sys_func == sys_clone) {
1346 clone_scno[current_personality] = i;
1351 if (tcp->s_ent->sys_func == sys_fork ||
1352 tcp->s_ent->sys_func == sys_vfork) {
1353 if (arg_setup(tcp, &state) < 0
1354 || get_arg0(tcp, &state, &tcp->inst[0]) < 0
1355 || get_arg1(tcp, &state, &tcp->inst[1]) < 0
1356 || change_syscall(tcp, &state,
1357 clone_scno[current_personality]) < 0
1358 || set_arg0(tcp, &state, CLONE_PTRACE|SIGCHLD) < 0
1359 || set_arg1(tcp, &state, 0) < 0
1360 || arg_finish_change(tcp, &state) < 0)
1362 tcp->u_arg[arg0_index] = CLONE_PTRACE|SIGCHLD;
1363 tcp->u_arg[arg1_index] = 0;
1364 tcp->flags |= TCB_BPTSET;
1368 if (tcp->s_ent->sys_func == sys_clone) {
1369 /* ia64 calls directly `clone (CLONE_VFORK | CLONE_VM)'
1370 contrary to x86 vfork above. Even on x86 we turn the
1371 vfork semantics into plain fork - each application must not
1372 depend on the vfork specifics according to POSIX. We would
1373 hang waiting for the parent resume otherwise. We need to
1374 clear also CLONE_VM but only in the CLONE_VFORK case as
1375 otherwise we would break pthread_create. */
1377 long new_arg0 = (tcp->u_arg[arg0_index] | CLONE_PTRACE);
1378 if (new_arg0 & CLONE_VFORK)
1379 new_arg0 &= ~(unsigned long)(CLONE_VFORK | CLONE_VM);
1380 if (arg_setup(tcp, &state) < 0
1381 || set_arg0(tcp, &state, new_arg0) < 0
1382 || arg_finish_change(tcp, &state) < 0)
1384 tcp->inst[0] = tcp->u_arg[arg0_index];
1385 tcp->inst[1] = tcp->u_arg[arg1_index];
1386 tcp->flags |= TCB_BPTSET;
1390 fprintf(stderr, "PANIC: setbpt for syscall %ld on %u???\n",
1391 tcp->scno, tcp->pid);
1396 clearbpt(struct tcb *tcp)
1398 arg_setup_state state;
1399 if (arg_setup(tcp, &state) < 0
1400 || change_syscall(tcp, &state, tcp->scno) < 0
1401 || restore_arg0(tcp, &state, tcp->inst[0]) < 0
1402 || restore_arg1(tcp, &state, tcp->inst[1]) < 0
1403 || arg_finish_change(tcp, &state))
1406 tcp->flags &= ~TCB_BPTSET;