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signal.c
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/*
* Copyright (c) 1991, 1992 Paul Kranenburg <[email protected]>
* Copyright (c) 1993 Branko Lankester <[email protected]>
* Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <[email protected]>
* Copyright (c) 1996-1999 Wichert Akkerman <[email protected]>
* Copyright (c) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Linux for s390 port by D.J. Barrow
* 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>
#elif defined(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
#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
static const struct xlat sigact_flags[] = {
#ifdef SA_RESTORER
XLAT(SA_RESTORER),
#endif
#ifdef SA_STACK
XLAT(SA_STACK),
#endif
#ifdef SA_RESTART
XLAT(SA_RESTART),
#endif
#ifdef SA_INTERRUPT
XLAT(SA_INTERRUPT),
#endif
#ifdef SA_NODEFER
XLAT(SA_NODEFER),
#endif
#if defined SA_NOMASK && SA_NODEFER != SA_NOMASK
XLAT(SA_NOMASK),
#endif
#ifdef SA_RESETHAND
XLAT(SA_RESETHAND),
#endif
#if defined SA_ONESHOT && SA_ONESHOT != SA_RESETHAND
XLAT(SA_ONESHOT),
#endif
#ifdef SA_SIGINFO
XLAT(SA_SIGINFO),
#endif
#ifdef SA_RESETHAND
XLAT(SA_RESETHAND),
#endif
#ifdef SA_ONSTACK
XLAT(SA_ONSTACK),
#endif
#ifdef SA_NODEFER
XLAT(SA_NODEFER),
#endif
#ifdef SA_NOCLDSTOP
XLAT(SA_NOCLDSTOP),
#endif
#ifdef SA_NOCLDWAIT
XLAT(SA_NOCLDWAIT),
#endif
#ifdef _SA_BSDCALL
XLAT(_SA_BSDCALL),
#endif
#ifdef SA_NOPTRACE
XLAT(SA_NOPTRACE),
#endif
XLAT_END
};
static const struct xlat sigprocmaskcmds[] = {
XLAT(SIG_BLOCK),
XLAT(SIG_UNBLOCK),
XLAT(SIG_SETMASK),
#ifdef SIG_SETMASK32
XLAT(SIG_SETMASK32),
#endif
XLAT_END
};
#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(int sig)
{
static char buf[sizeof("SIGRT_%d") + sizeof(int)*3];
if (sig >= 0 && sig < nsignals)
return signalent[sig];
#ifdef SIGRTMIN
if (sig >= __SIGRTMIN && sig <= __SIGRTMAX) {
sprintf(buf, "SIGRT_%d", (int)(sig - __SIGRTMIN));
return buf;
}
#endif
sprintf(buf, "%d", sig);
return buf;
}
static const char *
sprintsigmask(const char *str, sigset_t *mask)
/* set might include realtime sigs */
{
/* Was [8 * sizeof(sigset_t) * 8], but
* glibc sigset_t is huge (1024 bits = 128 *bytes*),
* and we were ending up with 8k (!) buffer here.
*
* No Unix system can have sig > 255
* (waitpid API won't be able to indicate death from one)
* and sig 0 doesn't exist either.
* Therefore max possible no of sigs is 255: 1..255
*/
static char outstr[8 * (255 * 2 / 3)];
int i, nsigs;
int maxsigs;
int show_members;
char sep;
char *s;
/* Note: nsignals = ARRAY_SIZE(signalent[]),
* and that array may not have SIGRTnn.
*/
#ifdef __SIGRTMAX
maxsigs = __SIGRTMAX + 1; /* instead */
#else
maxsigs = nsignals;
#endif
s = stpcpy(outstr, str);
nsigs = 0;
for (i = 1; i < maxsigs; i++) {
if (sigismember(mask, i) == 1)
nsigs++;
}
/* 1: show mask members, 0: show those which are NOT in mask */
show_members = (nsigs < nsignals * 2 / 3);
if (!show_members)
*s++ = '~';
sep = '[';
for (i = 1; i < maxsigs; i++) {
if (sigismember(mask, i) == show_members) {
*s++ = sep;
if (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;
}
static const char *
sprintsigmask_long(const char *str, long mask)
{
sigset_t s;
sigemptyset(&s);
*(long *)&s = mask;
return sprintsigmask(str, &s);
}
static void
printsigmask(sigset_t *mask)
{
tprints(sprintsigmask("", mask));
}
void
printsignal(int nr)
{
tprints(signame(nr));
}
void
print_sigset_addr_len(struct tcb *tcp, long addr, long len)
{
sigset_t ss;
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;
sigemptyset(&ss);
if (umoven(tcp, addr, len, (char *)&ss) < 0)
goto bad;
printsigmask(&ss);
}
#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 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_ASYNCNL -60 /* sent by asynch name lookup completion */
#endif
#ifndef SI_FROMUSER
# define SI_FROMUSER(sip) ((sip)->si_code <= 0)
#endif
static const struct xlat siginfo_codes[] = {
#ifdef SI_KERNEL
XLAT(SI_KERNEL),
#endif
#ifdef SI_USER
XLAT(SI_USER),
#endif
#ifdef SI_QUEUE
XLAT(SI_QUEUE),
#endif
#ifdef SI_TIMER
XLAT(SI_TIMER),
#endif
#ifdef SI_MESGQ
XLAT(SI_MESGQ),
#endif
#ifdef SI_ASYNCIO
XLAT(SI_ASYNCIO),
#endif
#ifdef SI_SIGIO
XLAT(SI_SIGIO),
#endif
#ifdef SI_TKILL
XLAT(SI_TKILL),
#endif
#ifdef SI_ASYNCNL
XLAT(SI_ASYNCNL),
#endif
#ifdef SI_NOINFO
XLAT(SI_NOINFO),
#endif
#ifdef SI_LWP
XLAT(SI_LWP),
#endif
XLAT_END
};
static const struct xlat sigill_codes[] = {
XLAT(ILL_ILLOPC),
XLAT(ILL_ILLOPN),
XLAT(ILL_ILLADR),
XLAT(ILL_ILLTRP),
XLAT(ILL_PRVOPC),
XLAT(ILL_PRVREG),
XLAT(ILL_COPROC),
XLAT(ILL_BADSTK),
XLAT_END
};
static const struct xlat sigfpe_codes[] = {
XLAT(FPE_INTDIV),
XLAT(FPE_INTOVF),
XLAT(FPE_FLTDIV),
XLAT(FPE_FLTOVF),
XLAT(FPE_FLTUND),
XLAT(FPE_FLTRES),
XLAT(FPE_FLTINV),
XLAT(FPE_FLTSUB),
XLAT_END
};
static const struct xlat sigtrap_codes[] = {
XLAT(TRAP_BRKPT),
XLAT(TRAP_TRACE),
XLAT_END
};
static const struct xlat sigchld_codes[] = {
XLAT(CLD_EXITED),
XLAT(CLD_KILLED),
XLAT(CLD_DUMPED),
XLAT(CLD_TRAPPED),
XLAT(CLD_STOPPED),
XLAT(CLD_CONTINUED),
XLAT_END
};
static const struct xlat sigpoll_codes[] = {
XLAT(POLL_IN),
XLAT(POLL_OUT),
XLAT(POLL_MSG),
XLAT(POLL_ERR),
XLAT(POLL_PRI),
XLAT(POLL_HUP),
XLAT_END
};
static const struct xlat sigprof_codes[] = {
#ifdef PROF_SIG
XLAT(PROF_SIG),
#endif
XLAT_END
};
#ifdef SIGEMT
static const struct xlat sigemt_codes[] = {
#ifdef EMT_TAGOVF
XLAT(EMT_TAGOVF),
#endif
XLAT_END
};
#endif
static const struct xlat sigsegv_codes[] = {
XLAT(SEGV_MAPERR),
XLAT(SEGV_ACCERR),
XLAT_END
};
static const struct xlat sigbus_codes[] = {
XLAT(BUS_ADRALN),
XLAT(BUS_ADRERR),
XLAT(BUS_OBJERR),
XLAT_END
};
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;
}
}
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 || 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)) {
tprintf(", si_pid=%lu, si_uid=%lu",
(unsigned long) sip->si_pid,
(unsigned long) sip->si_uid);
switch (sip->si_code) {
#ifdef SI_USER
case SI_USER:
break;
#endif
#ifdef SI_TKILL
case SI_TKILL:
break;
#endif
#ifdef SI_TIMER
case SI_TIMER:
tprintf(", si_value=%d", sip->si_int);
break;
#endif
default:
if (!sip->si_ptr)
break;
if (!verbose)
tprints(", ...");
else
tprintf(", si_value={int=%u, ptr=%#lx}",
sip->si_int,
(unsigned long) sip->si_ptr);
break;
}
}
else
#endif /* SI_FROMUSER */
{
switch (sip->si_signo) {
case SIGCHLD:
tprintf(", si_pid=%ld, si_status=",
(long) sip->si_pid);
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;
default:
if (sip->si_pid || sip->si_uid)
tprintf(", si_pid=%lu, si_uid=%lu",
(unsigned long) sip->si_pid,
(unsigned long) sip->si_uid);
if (!sip->si_ptr)
break;
if (!verbose)
tprints(", ...");
else {
tprintf(", si_value={int=%u, ptr=%#lx}",
sip->si_int,
(unsigned long) sip->si_ptr);
}
}
}
}
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)) {
tprints(sprintsigmask_long("", tcp->u_arg[0]));
}
else if (!syserror(tcp)) {
tcp->auxstr = sprintsigmask_long("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;
void (*sa_restorer)(void);
#endif /* !MIPS */
};
static void
decode_old_sigaction(struct tcb *tcp, long addr)
{
struct old_sigaction sa;
if (!addr) {
tprints("NULL");
return;
}
if (!verbose(tcp) || (exiting(tcp) && syserror(tcp))) {
tprintf("%#lx", addr);
return;
}
if (umove(tcp, addr, &sa) < 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
tprints(sprintsigmask("", (sigset_t *)sa.sa_mask));
#else
tprints(sprintsigmask_long("", 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;
sigset_t sigm;
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.
* tprints(sprintsigmask_long(") (mask ", uc.sc.oldmask));
*/
sigemptyset(&sigm);
memcpy(&sigm, uc.uc_sigmask, 8);
tprints(sprintsigmask(") (mask ", &sigm));
}
#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;
tprints(sprintsigmask(") (mask ", (sigset_t *)&sc.oldmask[0]));
}
#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.
*/
union {
sigset_t sig;
uint32_t mask[2];
} sigmask;
if (umove(tcp, *i386_esp_ptr, &signal_stack) < 0)
return 0;
sigemptyset(&sigmask.sig);
sigmask.mask[0] = signal_stack.sc.oldmask;
sigmask.mask[1] = signal_stack.extramask[0];
tprints(sprintsigmask(") (mask ", &sigmask.sig));
}
#elif defined(IA64)
if (entering(tcp)) {
struct sigcontext sc;
long sp;
sigset_t sigm;
/* 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;
sigemptyset(&sigm);
memcpy(&sigm, &sc.sc_mask, NSIG / 8);
tprints(sprintsigmask(") (mask ", &sigm));
}
#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;
tprints(sprintsigmask_long(") (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;
tprints(sprintsigmask_long(") (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;
tprints(sprintsigmask_long(") (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;
}
tprints(sprintsigmask_long(") (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;
sigset_t sigm;
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;
tprints(sprintsigmask_long(") (mask ", *(long *) &uc.uc_sigmask));
}
#elif defined(MIPS)
if (entering(tcp)) {
long sp;
struct pt_regs regs;