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strace/signal.c
Maarten ter Huurne 40c174b38b Include <linux/ptrace.h> regardless of <sys/reg.h> existence 
This fixes compilation with musl libc.
This approach was already used in process.c, so I assume it is safe.

* signal.c: Move [HAVE_LINUX_PTRACE_H] code out of [HAVE_SYS_REG_H] check.
* syscall.c: Likewise.
* util.c: Likewise.

Signed-off-by: Maarten ter Huurne <maarten@treewalker.org>
2014-10-31 23:04:59 +00:00

1386 lines
34 KiB
C
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/*
* Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
* Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
* Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
* Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
* Copyright (c) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Linux for s390 port by D.J. Barrow
* <barrow_dj@mail.yahoo.com,djbarrow@de.ibm.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "defs.h"
#include <sys/user.h>
#include <fcntl.h>
#ifdef HAVE_SYS_REG_H
# include <sys/reg.h>
#endif
#ifdef HAVE_LINUX_PTRACE_H
# undef PTRACE_SYSCALL
# ifdef HAVE_STRUCT_IA64_FPREG
# define ia64_fpreg XXX_ia64_fpreg
# endif
# ifdef HAVE_STRUCT_PT_ALL_USER_REGS
# define pt_all_user_regs XXX_pt_all_user_regs
# endif
# ifdef HAVE_STRUCT_PTRACE_PEEKSIGINFO_ARGS
# define ptrace_peeksiginfo_args XXX_ptrace_peeksiginfo_args
# endif
# include <linux/ptrace.h>
# undef ptrace_peeksiginfo_args
# undef ia64_fpreg
# undef pt_all_user_regs
#endif
#ifdef IA64
# include <asm/ptrace_offsets.h>
#endif
#if defined(SPARC) || defined(SPARC64) || defined(MIPS)
typedef struct {
struct pt_regs si_regs;
int si_mask;
} m_siginfo_t;
#elif defined HAVE_ASM_SIGCONTEXT_H
# if !defined(IA64) && !defined(X86_64) && !defined(X32)
# include <asm/sigcontext.h>
# endif
#else /* !HAVE_ASM_SIGCONTEXT_H */
# if defined M68K && !defined HAVE_STRUCT_SIGCONTEXT
struct sigcontext {
unsigned long sc_mask;
unsigned long sc_usp;
unsigned long sc_d0;
unsigned long sc_d1;
unsigned long sc_a0;
unsigned long sc_a1;
unsigned short sc_sr;
unsigned long sc_pc;
unsigned short sc_formatvec;
};
# endif /* M68K */
#endif /* !HAVE_ASM_SIGCONTEXT_H */
#ifndef NSIG
# warning: NSIG is not defined, using 32
# define NSIG 32
#elif NSIG < 32
# error: NSIG < 32
#endif
#ifdef HAVE_SIGACTION
/* The libc headers do not define this constant since it should only be
used by the implementation. So we define it here. */
#ifndef SA_RESTORER
# ifdef ASM_SA_RESTORER
# define SA_RESTORER ASM_SA_RESTORER
# endif
#endif
/* Some arches define this in their headers, but don't actually have it,
so we have to delete the define. */
#if defined(HPPA) || defined(IA64)
# undef SA_RESTORER
#endif
#include "xlat/sigact_flags.h"
#include "xlat/sigprocmaskcmds.h"
#endif /* HAVE_SIGACTION */
/* Anonymous realtime signals. */
/* Under glibc 2.1, SIGRTMIN et al are functions, but __SIGRTMIN is a
constant. This is what we want. Otherwise, just use SIGRTMIN. */
#ifdef SIGRTMIN
#ifndef __SIGRTMIN
#define __SIGRTMIN SIGRTMIN
#define __SIGRTMAX SIGRTMAX /* likewise */
#endif
#endif
/* Note on the size of sigset_t:
*
* In glibc, sigset_t is an array with space for 1024 bits (!),
* even though all arches supported by Linux have only 64 signals
* except MIPS, which has 128. IOW, it is 128 bytes long.
*
* In-kernel sigset_t is sized correctly (it is either 64 or 128 bit long).
* However, some old syscall return only 32 lower bits (one word).
* Example: sys_sigpending vs sys_rt_sigpending.
*
* Be aware of this fact when you try to
* memcpy(&tcp->u_arg[1], &something, sizeof(sigset_t))
* - sizeof(sigset_t) is much bigger than you think,
* it may overflow tcp->u_arg[] array, and it may try to copy more data
* than is really available in <something>.
* Similarly,
* umoven(tcp, addr, sizeof(sigset_t), &sigset)
* may be a bad idea: it'll try to read much more data than needed
* to fetch a sigset_t.
* Use (NSIG / 8) as a size instead.
*/
const char *
signame(const int sig)
{
static char buf[sizeof("SIGRT_%u") + sizeof(int)*3];
if (sig >= 0) {
const unsigned int s = sig;
if (s < nsignals)
return signalent[s];
#ifdef SIGRTMIN
if (s >= __SIGRTMIN && s <= __SIGRTMAX) {
sprintf(buf, "SIGRT_%u", s - __SIGRTMIN);
return buf;
}
#endif
}
sprintf(buf, "%d", sig);
return buf;
}
static unsigned int
popcount32(const uint32_t *a, unsigned int size)
{
unsigned int count = 0;
for (; size; ++a, --size) {
uint32_t x = *a;
#ifdef HAVE___BUILTIN_POPCOUNT
count += __builtin_popcount(x);
#else
for (; x; ++count)
x &= x - 1;
#endif
}
return count;
}
static const char *
sprintsigmask_n(const char *prefix, const void *sig_mask, unsigned int bytes)
{
/*
* The maximum number of signal names to be printed is NSIG * 2 / 3.
* Most of signal names have length 7,
* average length of signal names is less than 7.
* The length of prefix string does not exceed 16.
*/
static char outstr[128 + 8 * (NSIG * 2 / 3)];
char *s;
const uint32_t *mask;
uint32_t inverted_mask[NSIG / 32];
unsigned int size;
int i;
char sep;
s = stpcpy(outstr, prefix);
mask = sig_mask;
/* length of signal mask in 4-byte words */
size = (bytes >= NSIG / 8) ? NSIG / 32 : (bytes + 3) / 4;
/* check whether 2/3 or more bits are set */
if (popcount32(mask, size) >= size * 32 * 2 / 3) {
/* show those signals that are NOT in the mask */
unsigned int j;
for (j = 0; j < size; ++j)
inverted_mask[j] = ~mask[j];
mask = inverted_mask;
*s++ = '~';
}
sep = '[';
for (i = 0; (i = next_set_bit(mask, i, size * 32)) >= 0; ) {
++i;
*s++ = sep;
if ((unsigned) i < nsignals) {
s = stpcpy(s, signalent[i] + 3);
}
#ifdef SIGRTMIN
else if (i >= __SIGRTMIN && i <= __SIGRTMAX) {
s += sprintf(s, "RT_%u", i - __SIGRTMIN);
}
#endif
else {
s += sprintf(s, "%u", i);
}
sep = ' ';
}
if (sep == '[')
*s++ = sep;
*s++ = ']';
*s = '\0';
return outstr;
}
#define tprintsigmask_addr(prefix, mask) \
tprints(sprintsigmask_n((prefix), (mask), sizeof(mask)))
#define sprintsigmask_val(prefix, mask) \
sprintsigmask_n((prefix), &(mask), sizeof(mask))
#define tprintsigmask_val(prefix, mask) \
tprints(sprintsigmask_n((prefix), &(mask), sizeof(mask)))
void
printsignal(int nr)
{
tprints(signame(nr));
}
void
print_sigset_addr_len(struct tcb *tcp, long addr, long len)
{
char mask[NSIG / 8];
if (!addr) {
tprints("NULL");
return;
}
/* Here len is usually equals NSIG / 8 or current_wordsize.
* But we code this defensively:
*/
if (len < 0) {
bad:
tprintf("%#lx", addr);
return;
}
if (len >= NSIG / 8)
len = NSIG / 8;
else
len = (len + 3) & ~3;
if (umoven(tcp, addr, len, mask) < 0)
goto bad;
tprints(sprintsigmask_n("", mask, len));
}
#ifndef ILL_ILLOPC
#define ILL_ILLOPC 1 /* illegal opcode */
#define ILL_ILLOPN 2 /* illegal operand */
#define ILL_ILLADR 3 /* illegal addressing mode */
#define ILL_ILLTRP 4 /* illegal trap */
#define ILL_PRVOPC 5 /* privileged opcode */
#define ILL_PRVREG 6 /* privileged register */
#define ILL_COPROC 7 /* coprocessor error */
#define ILL_BADSTK 8 /* internal stack error */
#define FPE_INTDIV 1 /* integer divide by zero */
#define FPE_INTOVF 2 /* integer overflow */
#define FPE_FLTDIV 3 /* floating point divide by zero */
#define FPE_FLTOVF 4 /* floating point overflow */
#define FPE_FLTUND 5 /* floating point underflow */
#define FPE_FLTRES 6 /* floating point inexact result */
#define FPE_FLTINV 7 /* floating point invalid operation */
#define FPE_FLTSUB 8 /* subscript out of range */
#define SEGV_MAPERR 1 /* address not mapped to object */
#define SEGV_ACCERR 2 /* invalid permissions for mapped object */
#define BUS_ADRALN 1 /* invalid address alignment */
#define BUS_ADRERR 2 /* non-existant physical address */
#define BUS_OBJERR 3 /* object specific hardware error */
#define SYS_SECCOMP 1 /* seccomp triggered */
#define TRAP_BRKPT 1 /* process breakpoint */
#define TRAP_TRACE 2 /* process trace trap */
#define CLD_EXITED 1 /* child has exited */
#define CLD_KILLED 2 /* child was killed */
#define CLD_DUMPED 3 /* child terminated abnormally */
#define CLD_TRAPPED 4 /* traced child has trapped */
#define CLD_STOPPED 5 /* child has stopped */
#define CLD_CONTINUED 6 /* stopped child has continued */
#define POLL_IN 1 /* data input available */
#define POLL_OUT 2 /* output buffers available */
#define POLL_MSG 3 /* input message available */
#define POLL_ERR 4 /* i/o error */
#define POLL_PRI 5 /* high priority input available */
#define POLL_HUP 6 /* device disconnected */
#define SI_KERNEL 0x80 /* sent by kernel */
#define SI_USER 0 /* sent by kill, sigsend, raise */
#define SI_QUEUE -1 /* sent by sigqueue */
#define SI_TIMER -2 /* sent by timer expiration */
#define SI_MESGQ -3 /* sent by real time mesq state change */
#define SI_ASYNCIO -4 /* sent by AIO completion */
#define SI_SIGIO -5 /* sent by SIGIO */
#define SI_TKILL -6 /* sent by tkill */
#define SI_DETHREAD -7 /* sent by execve killing subsidiary threads */
#define SI_ASYNCNL -60 /* sent by asynch name lookup completion */
#endif
#ifndef SI_FROMUSER
# define SI_FROMUSER(sip) ((sip)->si_code <= 0)
#endif
#include "xlat/siginfo_codes.h"
#include "xlat/sigill_codes.h"
#include "xlat/sigfpe_codes.h"
#include "xlat/sigtrap_codes.h"
#include "xlat/sigchld_codes.h"
#include "xlat/sigpoll_codes.h"
#include "xlat/sigprof_codes.h"
#ifdef SIGEMT
#include "xlat/sigemt_codes.h"
#endif
#include "xlat/sigsegv_codes.h"
#include "xlat/sigbus_codes.h"
#ifndef SYS_SECCOMP
# define SYS_SECCOMP 1
#endif
#include "xlat/sigsys_codes.h"
static void
printsigsource(const siginfo_t *sip)
{
tprintf(", si_pid=%lu, si_uid=%lu",
(unsigned long) sip->si_pid,
(unsigned long) sip->si_uid);
}
static void
printsigval(const siginfo_t *sip, int verbose)
{
if (!verbose)
tprints(", ...");
else
tprintf(", si_value={int=%u, ptr=%#lx}",
sip->si_int,
(unsigned long) sip->si_ptr);
}
void
printsiginfo(siginfo_t *sip, int verbose)
{
const char *code;
if (sip->si_signo == 0) {
tprints("{}");
return;
}
tprints("{si_signo=");
printsignal(sip->si_signo);
code = xlookup(siginfo_codes, sip->si_code);
if (!code) {
switch (sip->si_signo) {
case SIGTRAP:
code = xlookup(sigtrap_codes, sip->si_code);
break;
case SIGCHLD:
code = xlookup(sigchld_codes, sip->si_code);
break;
case SIGPOLL:
code = xlookup(sigpoll_codes, sip->si_code);
break;
case SIGPROF:
code = xlookup(sigprof_codes, sip->si_code);
break;
case SIGILL:
code = xlookup(sigill_codes, sip->si_code);
break;
#ifdef SIGEMT
case SIGEMT:
code = xlookup(sigemt_codes, sip->si_code);
break;
#endif
case SIGFPE:
code = xlookup(sigfpe_codes, sip->si_code);
break;
case SIGSEGV:
code = xlookup(sigsegv_codes, sip->si_code);
break;
case SIGBUS:
code = xlookup(sigbus_codes, sip->si_code);
break;
case SIGSYS:
code = xlookup(sigsys_codes, sip->si_code);
break;
}
}
if (code)
tprintf(", si_code=%s", code);
else
tprintf(", si_code=%#x", sip->si_code);
#ifdef SI_NOINFO
if (sip->si_code != SI_NOINFO)
#endif
{
if (sip->si_errno) {
if (sip->si_errno < 0 || (unsigned) sip->si_errno >= nerrnos)
tprintf(", si_errno=%d", sip->si_errno);
else
tprintf(", si_errno=%s",
errnoent[sip->si_errno]);
}
#ifdef SI_FROMUSER
if (SI_FROMUSER(sip)) {
switch (sip->si_code) {
#ifdef SI_USER
case SI_USER:
printsigsource(sip);
break;
#endif
#ifdef SI_TKILL
case SI_TKILL:
printsigsource(sip);
break;
#endif
#ifdef SI_TIMER
case SI_TIMER:
tprintf(", si_timerid=%#x, si_overrun=%d",
sip->si_timerid, sip->si_overrun);
printsigval(sip, verbose);
break;
#endif
default:
printsigsource(sip);
if (sip->si_ptr)
printsigval(sip, verbose);
break;
}
}
else
#endif /* SI_FROMUSER */
{
switch (sip->si_signo) {
case SIGCHLD:
printsigsource(sip);
tprints(", si_status=");
if (sip->si_code == CLD_EXITED)
tprintf("%d", sip->si_status);
else
printsignal(sip->si_status);
if (!verbose)
tprints(", ...");
else
tprintf(", si_utime=%llu, si_stime=%llu",
(unsigned long long) sip->si_utime,
(unsigned long long) sip->si_stime);
break;
case SIGILL: case SIGFPE:
case SIGSEGV: case SIGBUS:
tprintf(", si_addr=%#lx",
(unsigned long) sip->si_addr);
break;
case SIGPOLL:
switch (sip->si_code) {
case POLL_IN: case POLL_OUT: case POLL_MSG:
tprintf(", si_band=%ld",
(long) sip->si_band);
break;
}
break;
#ifdef HAVE_SIGINFO_T_SI_SYSCALL
case SIGSYS:
tprintf(", si_call_addr=%#lx, si_syscall=%d, si_arch=%u",
(unsigned long) sip->si_call_addr,
sip->si_syscall, sip->si_arch);
break;
#endif
default:
if (sip->si_pid || sip->si_uid)
printsigsource(sip);
if (sip->si_ptr)
printsigval(sip, verbose);
}
}
}
tprints("}");
}
void
printsiginfo_at(struct tcb *tcp, long addr)
{
siginfo_t si;
if (!addr) {
tprints("NULL");
return;
}
if (syserror(tcp)) {
tprintf("%#lx", addr);
return;
}
if (umove(tcp, addr, &si) < 0) {
tprints("{???}");
return;
}
printsiginfo(&si, verbose(tcp));
}
int
sys_sigsetmask(struct tcb *tcp)
{
if (entering(tcp)) {
tprintsigmask_val("", tcp->u_arg[0]);
}
else if (!syserror(tcp)) {
tcp->auxstr = sprintsigmask_val("old mask ", tcp->u_rval);
return RVAL_HEX | RVAL_STR;
}
return 0;
}
#ifdef HAVE_SIGACTION
struct old_sigaction {
/* sa_handler may be a libc #define, need to use other name: */
#ifdef MIPS
unsigned int sa_flags;
void (*__sa_handler)(int);
/* Kernel treats sa_mask as an array of longs. */
unsigned long sa_mask[NSIG / sizeof(long) ? NSIG / sizeof(long) : 1];
#else
void (*__sa_handler)(int);
unsigned long sa_mask;
unsigned long sa_flags;
#endif /* !MIPS */
#ifdef SA_RESTORER
void (*sa_restorer)(void);
#endif
};
struct old_sigaction32 {
/* sa_handler may be a libc #define, need to use other name: */
uint32_t __sa_handler;
uint32_t sa_mask;
uint32_t sa_flags;
#ifdef SA_RESTORER
uint32_t sa_restorer;
#endif
};
static void
decode_old_sigaction(struct tcb *tcp, long addr)
{
struct old_sigaction sa;
int r;
if (!addr) {
tprints("NULL");
return;
}
if (!verbose(tcp) || (exiting(tcp) && syserror(tcp))) {
tprintf("%#lx", addr);
return;
}
#if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
if (current_wordsize != sizeof(sa.__sa_handler) && current_wordsize == 4) {
struct old_sigaction32 sa32;
r = umove(tcp, addr, &sa32);
if (r >= 0) {
memset(&sa, 0, sizeof(sa));
sa.__sa_handler = (void*)(uintptr_t)sa32.__sa_handler;
sa.sa_flags = sa32.sa_flags;
#ifdef SA_RESTORER
sa.sa_restorer = (void*)(uintptr_t)sa32.sa_restorer;
#endif
sa.sa_mask = sa32.sa_mask;
}
} else
#endif
{
r = umove(tcp, addr, &sa);
}
if (r < 0) {
tprints("{...}");
return;
}
/* Architectures using function pointers, like
* hppa, may need to manipulate the function pointer
* to compute the result of a comparison. However,
* the __sa_handler function pointer exists only in
* the address space of the traced process, and can't
* be manipulated by strace. In order to prevent the
* compiler from generating code to manipulate
* __sa_handler we cast the function pointers to long. */
if ((long)sa.__sa_handler == (long)SIG_ERR)
tprints("{SIG_ERR, ");
else if ((long)sa.__sa_handler == (long)SIG_DFL)
tprints("{SIG_DFL, ");
else if ((long)sa.__sa_handler == (long)SIG_IGN)
tprints("{SIG_IGN, ");
else
tprintf("{%#lx, ", (long) sa.__sa_handler);
#ifdef MIPS
tprintsigmask_addr("", sa.sa_mask);
#else
tprintsigmask_val("", sa.sa_mask);
#endif
tprints(", ");
printflags(sigact_flags, sa.sa_flags, "SA_???");
#ifdef SA_RESTORER
if (sa.sa_flags & SA_RESTORER)
tprintf(", %p", sa.sa_restorer);
#endif
tprints("}");
}
int
sys_sigaction(struct tcb *tcp)
{
if (entering(tcp)) {
printsignal(tcp->u_arg[0]);
tprints(", ");
decode_old_sigaction(tcp, tcp->u_arg[1]);
tprints(", ");
} else
decode_old_sigaction(tcp, tcp->u_arg[2]);
return 0;
}
int
sys_signal(struct tcb *tcp)
{
if (entering(tcp)) {
printsignal(tcp->u_arg[0]);
tprints(", ");
switch (tcp->u_arg[1]) {
case (long) SIG_ERR:
tprints("SIG_ERR");
break;
case (long) SIG_DFL:
tprints("SIG_DFL");
break;
case (long) SIG_IGN:
tprints("SIG_IGN");
break;
default:
tprintf("%#lx", tcp->u_arg[1]);
}
return 0;
}
else if (!syserror(tcp)) {
switch (tcp->u_rval) {
case (long) SIG_ERR:
tcp->auxstr = "SIG_ERR"; break;
case (long) SIG_DFL:
tcp->auxstr = "SIG_DFL"; break;
case (long) SIG_IGN:
tcp->auxstr = "SIG_IGN"; break;
default:
tcp->auxstr = NULL;
}
return RVAL_HEX | RVAL_STR;
}
return 0;
}
#endif /* HAVE_SIGACTION */
int
sys_sigreturn(struct tcb *tcp)
{
#if defined(ARM)
if (entering(tcp)) {
struct arm_sigcontext {
unsigned long trap_no;
unsigned long error_code;
unsigned long oldmask;
unsigned long arm_r0;
unsigned long arm_r1;
unsigned long arm_r2;
unsigned long arm_r3;
unsigned long arm_r4;
unsigned long arm_r5;
unsigned long arm_r6;
unsigned long arm_r7;
unsigned long arm_r8;
unsigned long arm_r9;
unsigned long arm_r10;
unsigned long arm_fp;
unsigned long arm_ip;
unsigned long arm_sp;
unsigned long arm_lr;
unsigned long arm_pc;
unsigned long arm_cpsr;
unsigned long fault_address;
};
struct arm_ucontext {
unsigned long uc_flags;
unsigned long uc_link; /* struct ucontext* */
/* The next three members comprise stack_t struct: */
unsigned long ss_sp; /* void* */
unsigned long ss_flags; /* int */
unsigned long ss_size; /* size_t */
struct arm_sigcontext sc;
/* These two members are sigset_t: */
unsigned long uc_sigmask[2];
/* more fields follow, which we aren't interested in */
};
struct arm_ucontext uc;
if (umove(tcp, arm_regs.ARM_sp, &uc) < 0)
return 0;
/*
* Kernel fills out uc.sc.oldmask too when it sets up signal stack,
* but for sigmask restore, sigreturn syscall uses uc.uc_sigmask instead.
*/
tprintsigmask_addr(") (mask ", uc.uc_sigmask);
}
#elif defined(S390) || defined(S390X)
if (entering(tcp)) {
long usp;
struct sigcontext sc;
if (upeek(tcp->pid, PT_GPR15, &usp) < 0)
return 0;
if (umove(tcp, usp + __SIGNAL_FRAMESIZE, &sc) < 0)
return 0;
tprintsigmask_addr(") (mask ", sc.oldmask);
}
#elif defined(I386) || defined(X86_64)
# if defined(X86_64)
if (current_personality == 0) /* 64-bit */
return 0;
# endif
if (entering(tcp)) {
struct i386_sigcontext_struct {
uint16_t gs, __gsh;
uint16_t fs, __fsh;
uint16_t es, __esh;
uint16_t ds, __dsh;
uint32_t edi;
uint32_t esi;
uint32_t ebp;
uint32_t esp;
uint32_t ebx;
uint32_t edx;
uint32_t ecx;
uint32_t eax;
uint32_t trapno;
uint32_t err;
uint32_t eip;
uint16_t cs, __csh;
uint32_t eflags;
uint32_t esp_at_signal;
uint16_t ss, __ssh;
uint32_t i387;
uint32_t oldmask;
uint32_t cr2;
};
struct i386_fpstate {
uint32_t cw;
uint32_t sw;
uint32_t tag;
uint32_t ipoff;
uint32_t cssel;
uint32_t dataoff;
uint32_t datasel;
uint8_t st[8][10]; /* 8*10 bytes: FP regs */
uint16_t status;
uint16_t magic;
uint32_t fxsr_env[6];
uint32_t mxcsr;
uint32_t reserved;
uint8_t stx[8][16]; /* 8*16 bytes: FP regs, each padded to 16 bytes */
uint8_t xmm[8][16]; /* 8 XMM regs */
uint32_t padding1[44];
uint32_t padding2[12]; /* union with struct _fpx_sw_bytes */
};
struct {
struct i386_sigcontext_struct sc;
struct i386_fpstate fp;
uint32_t extramask[1];
} signal_stack;
/* On i386, sc is followed on stack by struct fpstate
* and after it an additional u32 extramask[1] which holds
* upper half of the mask.
*/
uint32_t sigmask[2];
if (umove(tcp, *i386_esp_ptr, &signal_stack) < 0)
return 0;
sigmask[0] = signal_stack.sc.oldmask;
sigmask[1] = signal_stack.extramask[0];
tprintsigmask_addr(") (mask ", sigmask);
}
#elif defined(IA64)
if (entering(tcp)) {
struct sigcontext sc;
long sp;
/* offset of sigcontext in the kernel's sigframe structure: */
# define SIGFRAME_SC_OFFSET 0x90
if (upeek(tcp->pid, PT_R12, &sp) < 0)
return 0;
if (umove(tcp, sp + 16 + SIGFRAME_SC_OFFSET, &sc) < 0)
return 0;
tprintsigmask_val(") (mask ", sc.sc_mask);
}
#elif defined(POWERPC)
if (entering(tcp)) {
long esp;
struct sigcontext sc;
esp = ppc_regs.gpr[1];
/* Skip dummy stack frame. */
#ifdef POWERPC64
if (current_personality == 0)
esp += 128;
else
esp += 64;
#else
esp += 64;
#endif
if (umove(tcp, esp, &sc) < 0)
return 0;
tprintsigmask_val(") (mask ", sc.oldmask);
}
#elif defined(M68K)
if (entering(tcp)) {
long usp;
struct sigcontext sc;
if (upeek(tcp->pid, 4*PT_USP, &usp) < 0)
return 0;
if (umove(tcp, usp, &sc) < 0)
return 0;
tprintsigmask_val(") (mask ", sc.sc_mask);
}
#elif defined(ALPHA)
if (entering(tcp)) {
long fp;
struct sigcontext sc;
if (upeek(tcp->pid, REG_FP, &fp) < 0)
return 0;
if (umove(tcp, fp, &sc) < 0)
return 0;
tprintsigmask_val(") (mask ", sc.sc_mask);
}
#elif defined(SPARC) || defined(SPARC64)
if (entering(tcp)) {
long i1;
m_siginfo_t si;
i1 = sparc_regs.u_regs[U_REG_O1];
if (umove(tcp, i1, &si) < 0) {
perror_msg("sigreturn: umove");
return 0;
}
tprintsigmask_val(") (mask ", si.si_mask);
}
#elif defined(LINUX_MIPSN32) || defined(LINUX_MIPSN64)
/* This decodes rt_sigreturn. The 64-bit ABIs do not have
sigreturn. */
if (entering(tcp)) {
long sp;
struct ucontext uc;
if (upeek(tcp->pid, REG_SP, &sp) < 0)
return 0;
/* There are six words followed by a 128-byte siginfo. */
sp = sp + 6 * 4 + 128;
if (umove(tcp, sp, &uc) < 0)
return 0;
tprintsigmask_val(") (mask ", uc.uc_sigmask);
}
#elif defined(MIPS)
if (entering(tcp)) {
long sp;
struct pt_regs regs;
m_siginfo_t si;
if (ptrace(PTRACE_GETREGS, tcp->pid, (char *)&regs, 0) < 0) {
perror_msg("sigreturn: PTRACE_GETREGS");
return 0;
}
sp = regs.regs[29];
if (umove(tcp, sp, &si) < 0)
return 0;
tprintsigmask_val(") (mask ", si.si_mask);
}
#elif defined(CRISV10) || defined(CRISV32)
if (entering(tcp)) {
struct sigcontext sc;
long regs[PT_MAX+1];
if (ptrace(PTRACE_GETREGS, tcp->pid, NULL, (long)regs) < 0) {
perror_msg("sigreturn: PTRACE_GETREGS");
return 0;
}
if (umove(tcp, regs[PT_USP], &sc) < 0)
return 0;
tprintsigmask_val(") (mask ", sc.oldmask);
}
#elif defined(TILE)
if (entering(tcp)) {
struct ucontext uc;
/* offset of ucontext in the kernel's sigframe structure */
# define SIGFRAME_UC_OFFSET C_ABI_SAVE_AREA_SIZE + sizeof(siginfo_t)
if (umove(tcp, tile_regs.sp + SIGFRAME_UC_OFFSET, &uc) < 0)
return 0;
tprintsigmask_val(") (mask ", uc.uc_sigmask);
}
#elif defined(MICROBLAZE)
/* TODO: Verify that this is correct... */
if (entering(tcp)) {
struct sigcontext sc;
long sp;
/* Read r1, the stack pointer. */
if (upeek(tcp->pid, 1 * 4, &sp) < 0)
return 0;
if (umove(tcp, sp, &sc) < 0)
return 0;
tprintsigmask_val(") (mask ", sc.oldmask);
}
#elif defined(XTENSA)
/* Xtensa only has rt_sys_sigreturn */
#elif defined(ARC)
/* ARC syscall ABI only supports rt_sys_sigreturn */
#else
# warning No sys_sigreturn() for this architecture
# warning (no problem, just a reminder :-)
#endif
return 0;
}
int
sys_siggetmask(struct tcb *tcp)
{
if (exiting(tcp)) {
tcp->auxstr = sprintsigmask_val("mask ", tcp->u_rval);
}
return RVAL_HEX | RVAL_STR;
}
int
sys_sigsuspend(struct tcb *tcp)
{
if (entering(tcp)) {
tprintsigmask_val("", tcp->u_arg[2]);
}
return 0;
}
#if !defined SS_ONSTACK
#define SS_ONSTACK 1
#define SS_DISABLE 2
#endif
#include "xlat/sigaltstack_flags.h"
static void
print_stack_t(struct tcb *tcp, unsigned long addr)
{
stack_t ss;
int r;
if (!addr) {
tprints("NULL");
return;
}
#if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
if (current_wordsize != sizeof(ss.ss_sp) && current_wordsize == 4) {
struct {
uint32_t ss_sp;
int32_t ss_flags;
uint32_t ss_size;
} ss32;
r = umove(tcp, addr, &ss32);
if (r >= 0) {
memset(&ss, 0, sizeof(ss));
ss.ss_sp = (void*)(unsigned long) ss32.ss_sp;
ss.ss_flags = ss32.ss_flags;
ss.ss_size = (unsigned long) ss32.ss_size;
}
} else
#endif
{
r = umove(tcp, addr, &ss);
}
if (r < 0) {
tprintf("%#lx", addr);
} else {
tprintf("{ss_sp=%#lx, ss_flags=", (unsigned long) ss.ss_sp);
printflags(sigaltstack_flags, ss.ss_flags, "SS_???");
tprintf(", ss_size=%lu}", (unsigned long) ss.ss_size);
}
}
int
sys_sigaltstack(struct tcb *tcp)
{
if (entering(tcp)) {
print_stack_t(tcp, tcp->u_arg[0]);
}
else {
tprints(", ");
print_stack_t(tcp, tcp->u_arg[1]);
}
return 0;
}
#ifdef HAVE_SIGACTION
/* "Old" sigprocmask, which operates with word-sized signal masks */
int
sys_sigprocmask(struct tcb *tcp)
{
# ifdef ALPHA
if (entering(tcp)) {
/*
* Alpha/OSF is different: it doesn't pass in two pointers,
* but rather passes in the new bitmask as an argument and
* then returns the old bitmask. This "works" because we
* only have 64 signals to worry about. If you want more,
* use of the rt_sigprocmask syscall is required.
* Alpha:
* old = osf_sigprocmask(how, new);
* Everyone else:
* ret = sigprocmask(how, &new, &old, ...);
*/
printxval(sigprocmaskcmds, tcp->u_arg[0], "SIG_???");
tprintsigmask_val(", ", tcp->u_arg[1]);
}
else if (!syserror(tcp)) {
tcp->auxstr = sprintsigmask_val("old mask ", tcp->u_rval);
return RVAL_HEX | RVAL_STR;
}
# else /* !ALPHA */
if (entering(tcp)) {
printxval(sigprocmaskcmds, tcp->u_arg[0], "SIG_???");
tprints(", ");
print_sigset_addr_len(tcp, tcp->u_arg[1], current_wordsize);
tprints(", ");
}
else {
if (syserror(tcp))
tprintf("%#lx", tcp->u_arg[2]);
else
print_sigset_addr_len(tcp, tcp->u_arg[2], current_wordsize);
}
# endif /* !ALPHA */
return 0;
}
#endif /* HAVE_SIGACTION */
int
sys_kill(struct tcb *tcp)
{
if (entering(tcp)) {
tprintf("%ld, %s",
widen_to_long(tcp->u_arg[0]),
signame(tcp->u_arg[1])
);
}
return 0;
}
int
sys_tgkill(struct tcb *tcp)
{
if (entering(tcp)) {
tprintf("%ld, %ld, %s",
widen_to_long(tcp->u_arg[0]),
widen_to_long(tcp->u_arg[1]),
signame(tcp->u_arg[2])
);
}
return 0;
}
int
sys_sigpending(struct tcb *tcp)
{
if (exiting(tcp)) {
if (syserror(tcp))
tprintf("%#lx", tcp->u_arg[0]);
else
print_sigset_addr_len(tcp, tcp->u_arg[0], current_wordsize);
}
return 0;
}
int
sys_rt_sigprocmask(struct tcb *tcp)
{
/* Note: arg[3] is the length of the sigset. Kernel requires NSIG / 8 */
if (entering(tcp)) {
printxval(sigprocmaskcmds, tcp->u_arg[0], "SIG_???");
tprints(", ");
print_sigset_addr_len(tcp, tcp->u_arg[1], tcp->u_arg[3]);
tprints(", ");
}
else {
if (syserror(tcp))
tprintf("%#lx", tcp->u_arg[2]);
else
print_sigset_addr_len(tcp, tcp->u_arg[2], tcp->u_arg[3]);
tprintf(", %lu", tcp->u_arg[3]);
}
return 0;
}
/* Structure describing the action to be taken when a signal arrives. */
struct new_sigaction
{
/* sa_handler may be a libc #define, need to use other name: */
#ifdef MIPS
unsigned int sa_flags;
void (*__sa_handler)(int);
#else
void (*__sa_handler)(int);
unsigned long sa_flags;
#endif /* !MIPS */
#ifdef SA_RESTORER
void (*sa_restorer)(void);
#endif
/* Kernel treats sa_mask as an array of longs. */
unsigned long sa_mask[NSIG / sizeof(long) ? NSIG / sizeof(long) : 1];
};
/* Same for i386-on-x86_64 and similar cases */
struct new_sigaction32
{
uint32_t __sa_handler;
uint32_t sa_flags;
#ifdef SA_RESTORER
uint32_t sa_restorer;
#endif
uint32_t sa_mask[2 * (NSIG / sizeof(long) ? NSIG / sizeof(long) : 1)];
};
static void
decode_new_sigaction(struct tcb *tcp, long addr)
{
struct new_sigaction sa;
int r;
if (!addr) {
tprints("NULL");
return;
}
if (!verbose(tcp) || (exiting(tcp) && syserror(tcp))) {
tprintf("%#lx", addr);
return;
}
#if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
if (current_wordsize != sizeof(sa.sa_flags) && current_wordsize == 4) {
struct new_sigaction32 sa32;
r = umove(tcp, addr, &sa32);
if (r >= 0) {
memset(&sa, 0, sizeof(sa));
sa.__sa_handler = (void*)(unsigned long)sa32.__sa_handler;
sa.sa_flags = sa32.sa_flags;
#ifdef SA_RESTORER
sa.sa_restorer = (void*)(unsigned long)sa32.sa_restorer;
#endif
/* Kernel treats sa_mask as an array of longs.
* For 32-bit process, "long" is uint32_t, thus, for example,
* 32th bit in sa_mask will end up as bit 0 in sa_mask[1].
* But for (64-bit) kernel, 32th bit in sa_mask is
* 32th bit in 0th (64-bit) long!
* For little-endian, it's the same.
* For big-endian, we swap 32-bit words.
*/
sa.sa_mask[0] = sa32.sa_mask[0] + ((long)(sa32.sa_mask[1]) << 32);
}
} else
#endif
{
r = umove(tcp, addr, &sa);
}
if (r < 0) {
tprints("{...}");
return;
}
/* Architectures using function pointers, like
* hppa, may need to manipulate the function pointer
* to compute the result of a comparison. However,
* the __sa_handler function pointer exists only in
* the address space of the traced process, and can't
* be manipulated by strace. In order to prevent the
* compiler from generating code to manipulate
* __sa_handler we cast the function pointers to long. */
if ((long)sa.__sa_handler == (long)SIG_ERR)
tprints("{SIG_ERR, ");
else if ((long)sa.__sa_handler == (long)SIG_DFL)
tprints("{SIG_DFL, ");
else if ((long)sa.__sa_handler == (long)SIG_IGN)
tprints("{SIG_IGN, ");
else
tprintf("{%#lx, ", (long) sa.__sa_handler);
/*
* Sigset size is in tcp->u_arg[4] (SPARC)
* or in tcp->u_arg[3] (all other),
* but kernel won't handle sys_rt_sigaction
* with wrong sigset size (just returns EINVAL instead).
* We just fetch the right size, which is NSIG / 8.
*/
tprintsigmask_val("", sa.sa_mask);
tprints(", ");
printflags(sigact_flags, sa.sa_flags, "SA_???");
#ifdef SA_RESTORER
if (sa.sa_flags & SA_RESTORER)
tprintf(", %p", sa.sa_restorer);
#endif
tprints("}");
}
int
sys_rt_sigaction(struct tcb *tcp)
{
if (entering(tcp)) {
printsignal(tcp->u_arg[0]);
tprints(", ");
decode_new_sigaction(tcp, tcp->u_arg[1]);
tprints(", ");
} else {
decode_new_sigaction(tcp, tcp->u_arg[2]);
#if defined(SPARC) || defined(SPARC64)
tprintf(", %#lx, %lu", tcp->u_arg[3], tcp->u_arg[4]);
#elif defined(ALPHA)
tprintf(", %lu, %#lx", tcp->u_arg[3], tcp->u_arg[4]);
#else
tprintf(", %lu", tcp->u_arg[3]);
#endif
}
return 0;
}
int
sys_rt_sigpending(struct tcb *tcp)
{
if (exiting(tcp)) {
/*
* One of the few syscalls where sigset size (arg[1])
* is allowed to be <= NSIG / 8, not strictly ==.
* This allows non-rt sigpending() syscall
* to reuse rt_sigpending() code in kernel.
*/
if (syserror(tcp))
tprintf("%#lx", tcp->u_arg[0]);
else
print_sigset_addr_len(tcp, tcp->u_arg[0], tcp->u_arg[1]);
tprintf(", %lu", tcp->u_arg[1]);
}
return 0;
}
int
sys_rt_sigsuspend(struct tcb *tcp)
{
if (entering(tcp)) {
/* NB: kernel requires arg[1] == NSIG / 8 */
print_sigset_addr_len(tcp, tcp->u_arg[0], tcp->u_arg[1]);
tprintf(", %lu", tcp->u_arg[1]);
}
return 0;
}
static void
print_sigqueueinfo(struct tcb *tcp, int sig, unsigned long uinfo)
{
printsignal(sig);
tprints(", ");
printsiginfo_at(tcp, uinfo);
}
int
sys_rt_sigqueueinfo(struct tcb *tcp)
{
if (entering(tcp)) {
tprintf("%lu, ", tcp->u_arg[0]);
print_sigqueueinfo(tcp, tcp->u_arg[1], tcp->u_arg[2]);
}
return 0;
}
int
sys_rt_tgsigqueueinfo(struct tcb *tcp)
{
if (entering(tcp)) {
tprintf("%lu, %lu, ", tcp->u_arg[0], tcp->u_arg[1]);
print_sigqueueinfo(tcp, tcp->u_arg[2], tcp->u_arg[3]);
}
return 0;
}
int sys_rt_sigtimedwait(struct tcb *tcp)
{
/* NB: kernel requires arg[3] == NSIG / 8 */
if (entering(tcp)) {
print_sigset_addr_len(tcp, tcp->u_arg[0], tcp->u_arg[3]);
tprints(", ");
/* This is the only "return" parameter, */
if (tcp->u_arg[1] != 0)
return 0;
/* ... if it's NULL, can decode all on entry */
tprints("NULL, ");
}
else if (tcp->u_arg[1] != 0) {
/* syscall exit, and u_arg[1] wasn't NULL */
printsiginfo_at(tcp, tcp->u_arg[1]);
tprints(", ");
}
else {
/* syscall exit, and u_arg[1] was NULL */
return 0;
}
print_timespec(tcp, tcp->u_arg[2]);
tprintf(", %lu", tcp->u_arg[3]);
return 0;
};
int
sys_restart_syscall(struct tcb *tcp)
{
if (entering(tcp))
tprints("<... resuming interrupted call ...>");
return 0;
}
static int
do_signalfd(struct tcb *tcp, int flags_arg)
{
/* NB: kernel requires arg[2] == NSIG / 8 */
if (entering(tcp)) {
printfd(tcp, tcp->u_arg[0]);
tprints(", ");
print_sigset_addr_len(tcp, tcp->u_arg[1], tcp->u_arg[2]);
tprintf(", %lu", tcp->u_arg[2]);
if (flags_arg >= 0) {
tprints(", ");
printflags(open_mode_flags, tcp->u_arg[flags_arg], "O_???");
}
}
return 0;
}
int
sys_signalfd(struct tcb *tcp)
{
return do_signalfd(tcp, -1);
}
int
sys_signalfd4(struct tcb *tcp)
{
return do_signalfd(tcp, 3);
}
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