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a325a78866c9cf67ffab5a4bfa36bba1f6f2cff2
mckernel/arch/x86/kernel/syscall.c
Tomoki Shirasawa a325a78866 refactoring to send signal
2015-10-15 17:10:02 +09:00

1084 lines
28 KiB
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/**
* \file syscall.c
* License details are found in the file LICENSE.
* \brief
* archtecture depended system call handlers
* \author Gou Nakamura <go.nakamura.yw@hitachi-solutions.com> \par
* Copyright (C) 2013 Hitachi, Ltd.
* \author Masamichi Takagi <m-takagi@ab.jp.nec.com> \par
* Copyright (C) 2013 NEC Corporation
* \author Tomoki Shirasawa <tomoki.shirasawa.kk@hitachi-solutions.com> \par
* Copyright (C) 2013 Hitachi, Ltd.
*/
/*
* HISTORY:
*/
#include <ihk/cpu.h>
#include <ihk/debug.h>
#include <cls.h>
#include <cpulocal.h>
#include <syscall.h>
#include <process.h>
#include <string.h>
#include <errno.h>
#include <kmalloc.h>
#include <uio.h>
void terminate(int, int);
int copy_from_user(void *dst, const void *src, size_t siz);
int copy_to_user(void *dst, const void *src, size_t siz);
int write_process_vm(struct process_vm *vm, void *dst, const void *src, size_t siz);
long do_sigaction(int sig, struct k_sigaction *act, struct k_sigaction *oact);
long syscall(int num, ihk_mc_user_context_t *ctx);
extern void save_fp_regs(struct thread *proc);
//#define DEBUG_PRINT_SC
#ifdef DEBUG_PRINT_SC
#define dkprintf kprintf
#else
#define dkprintf(...) do { if (0) kprintf(__VA_ARGS__); } while (0)
#endif
uintptr_t debug_constants[] = {
sizeof(struct cpu_local_var),
offsetof(struct cpu_local_var, current),
offsetof(struct cpu_local_var, runq),
offsetof(struct cpu_local_var, status),
offsetof(struct thread, ctx),
offsetof(struct thread, sched_list),
offsetof(struct thread, proc),
offsetof(struct thread, tstatus),
offsetof(struct process, pid),
offsetof(struct thread, tid),
-1,
};
/*
See dkprintf("BSP HW ID = %d, ", bsp_hw_id); (in ./mcos/kernel/ap.c)
Core with BSP HW ID 224 is 1st logical core of last physical core.
It boots first and is given SW-ID of 0
Core with BSP HW ID 0 is 1st logical core of 1st physical core.
It boots next and is given SW-ID of 1.
Core with BSP HW ID 1 boots next and is given SW-ID of 2.
Core with BSP HW ID 2 boots next and is given SW-ID of 3.
Core with BSP HW ID 3 boots next and is given SW-ID of 4.
...
Core with BSP HW ID 220 is 1st logical core of 56-th physical core.
It boots next and is given SW-ID of 221.
Core with BSP HW ID 221 boots next and is given SW-ID of 222.
Core with BSP HW ID 222 boots next and is given SW-ID of 223.
Core with BSP HW ID 223 boots next and is given SW-ID of 224.
Core with BSP HW ID 225 is 2nd logical core of last physical core.
It boots next and is given SW-ID of 225.
Core with BSP HW ID 226 boots next and is given SW-ID of 226.
Core with BSP HW ID 227 boots next and is given SW-ID of 227.
*/
ihk_spinlock_t cpuid_head_lock = 0;
static int cpuid_head = 0;
/* archtecture-depended syscall handlers */
int obtain_clone_cpuid() {
/* see above on BSP HW ID */
struct ihk_mc_cpu_info *cpu_info = ihk_mc_get_cpu_info();
int cpuid, nretry = 0;
ihk_mc_spinlock_lock_noirq(&cpuid_head_lock);
/* Always start from 0 to fill in LWK cores linearily */
cpuid_head = 0;
retry:
/* Try to obtain next physical core */
cpuid = cpuid_head;
/* A hyper-threading core on the same physical core as
the parent process might be chosen. Use sched_setaffinity
if you want to skip that kind of busy physical core for
performance reason. */
cpuid_head += 1;
if(cpuid_head >= cpu_info->ncpus) {
cpuid_head = 0;
}
/* A hyper-threading core whose parent physical core has a
process on one of its hyper-threading core might
be chosen. Use sched_setaffinity if you want to skip that
kind of busy physical core for performance reason. */
if(get_cpu_local_var(cpuid)->status != CPU_STATUS_IDLE) {
nretry++;
if(nretry >= cpu_info->ncpus) {
cpuid = -1;
ihk_mc_spinlock_unlock_noirq(&cpuid_head_lock);
goto out;
}
goto retry;
}
get_cpu_local_var(cpuid)->status = CPU_STATUS_RESERVED;
ihk_mc_spinlock_unlock_noirq(&cpuid_head_lock);
out:
return cpuid;
}
SYSCALL_DECLARE(rt_sigaction)
{
int sig = ihk_mc_syscall_arg0(ctx);
const struct sigaction *act = (const struct sigaction *)ihk_mc_syscall_arg1(ctx);
struct sigaction *oact = (struct sigaction *)ihk_mc_syscall_arg2(ctx);
size_t sigsetsize = ihk_mc_syscall_arg3(ctx);
struct k_sigaction new_sa, old_sa;
int rc;
if(sig == SIGKILL || sig == SIGSTOP || sig <= 0 || sig > 64)
return -EINVAL;
if (sigsetsize != sizeof(sigset_t))
return -EINVAL;
if(act)
if(copy_from_user(&new_sa.sa, act, sizeof new_sa.sa)){
goto fault;
}
rc = do_sigaction(sig, act? &new_sa: NULL, oact? &old_sa: NULL);
if(rc == 0 && oact)
if(copy_to_user(oact, &old_sa.sa, sizeof old_sa.sa)){
goto fault;
}
return rc;
fault:
return -EFAULT;
}
struct sigsp {
struct x86_user_context regs;
unsigned long sigrc;
unsigned long sigmask;
int ssflags;
int num;
int restart;
siginfo_t info;
};
SYSCALL_DECLARE(rt_sigreturn)
{
struct thread *thread = cpu_local_var(current);
struct x86_user_context *regs;
struct sigsp *sigsp;
asm("movq %%gs:132, %0" : "=r" (regs));
--regs;
sigsp = (struct sigsp *)regs->gpr.rsp;
if(copy_from_user(regs, &sigsp->regs, sizeof(struct x86_user_context)))
return -EFAULT;
thread->sigmask.__val[0] = sigsp->sigmask;
thread->sigstack.ss_flags = sigsp->ssflags;
if(sigsp->restart){
return syscall(sigsp->num, (ihk_mc_user_context_t *)regs);
}
return sigsp->sigrc;
}
extern struct cpu_local_var *clv;
extern unsigned long do_kill(struct thread *thread, int pid, int tid, int sig, struct siginfo *info, int ptracecont);
extern void interrupt_syscall(int all, int pid);
extern int num_processors;
#define RFLAGS_MASK (RFLAGS_CF | RFLAGS_PF | RFLAGS_AF | RFLAGS_ZF | \
RFLAGS_SF | RFLAGS_TF | RFLAGS_DF | RFLAGS_OF | \
RFLAGS_NT | RFLAGS_RF | RFLAGS_AC)
#define DB6_RESERVED_MASK (0xffffffffffff1ff0UL)
#define DB6_RESERVED_SET (0xffff0ff0UL)
#define DB7_RESERVED_MASK (0xffffffff0000dc00UL)
#define DB7_RESERVED_SET (0x400UL)
extern ihk_mc_user_context_t *lookup_user_context(struct thread *thread);
long
ptrace_read_user(struct thread *thread, long addr, unsigned long *value)
{
unsigned long *p;
struct x86_user_context *uctx;
size_t off;
if ((addr < 0) || (addr & (sizeof(*value) - 1))) {
return -EIO;
}
else if (addr < sizeof(struct user_regs_struct)) {
uctx = lookup_user_context(thread);
if (!uctx) {
return -EIO;
}
if (addr < offsetof(struct user_regs_struct, fs_base)) {
*value = *(unsigned long *)(
(uintptr_t)(&uctx->gpr) + addr);
}
else {
off = addr - offsetof(struct user_regs_struct, fs_base);
*value = *(unsigned long *)(
(uintptr_t)(&uctx->sr) + off);
}
return 0;
}
if (offsetof(struct user, u_debugreg[0]) <= addr &&
addr < offsetof(struct user, u_debugreg[8])) {
if (addr & (sizeof(*value) - 1)) return -EIO;
if (thread->ptrace_debugreg == NULL) {
kprintf("ptrace_read_user: missing ptrace_debugreg\n");
return -EFAULT;
}
p = &thread->ptrace_debugreg[(addr - offsetof(struct user, u_debugreg[0])) / sizeof(*value)];
*value = *p;
return 0;
}
/* SUCCESS others */
dkprintf("ptrace_read_user,addr=%d\n", addr);
*value = 0;
return 0;
}
long
ptrace_write_user(struct thread *thread, long addr, unsigned long value)
{
unsigned long *p;
struct x86_user_context *uctx;
size_t off;
if ((addr < 0) || (addr & (sizeof(value) - 1))) {
return -EIO;
}
else if (addr < sizeof(struct user_regs_struct)) {
uctx = lookup_user_context(thread);
if (!uctx) {
return -EIO;
}
if (addr == offsetof(struct user_regs_struct, eflags)) {
uctx->gpr.rflags &= ~RFLAGS_MASK;
uctx->gpr.rflags |= (value & RFLAGS_MASK);
}
else if (addr < offsetof(struct user_regs_struct, fs_base)) {
*(unsigned long *)((uintptr_t)(&uctx->gpr) + addr)
= value;
}
else {
off = addr - offsetof(struct user_regs_struct,
fs_base);
*(unsigned long *)((uintptr_t)(&uctx->sr) + off)
= value;
}
return 0;
}
if (offsetof(struct user, u_debugreg[0]) <= addr &&
addr < offsetof(struct user, u_debugreg[8])) {
if (addr & (sizeof(value) - 1)) return -EIO;
if (thread->ptrace_debugreg == NULL) {
kprintf("ptrace_write_user: missing ptrace_debugreg\n");
return -EFAULT;
}
p = &thread->ptrace_debugreg[(addr - offsetof(struct user, u_debugreg[0])) / sizeof(value)];
if (addr == offsetof(struct user, u_debugreg[6])) {
value &= ~DB6_RESERVED_MASK;
value |= DB6_RESERVED_SET;
}
if (addr == offsetof(struct user, u_debugreg[7])) {
value &= ~DB7_RESERVED_MASK;
value |= DB7_RESERVED_SET;
}
*p = value;
return 0;
}
/* SUCCESS others */
dkprintf("ptrace_write_user,addr=%d\n", addr);
return 0;
}
long
alloc_debugreg(struct thread *thread)
{
thread->ptrace_debugreg = kmalloc(sizeof(*thread->ptrace_debugreg) * 8, IHK_MC_AP_NOWAIT);
if (thread->ptrace_debugreg == NULL) {
kprintf("alloc_debugreg: no memory.\n");
return -ENOMEM;
}
memset(thread->ptrace_debugreg, '\0', sizeof(*thread->ptrace_debugreg) * 8);
thread->ptrace_debugreg[6] = DB6_RESERVED_SET;
thread->ptrace_debugreg[7] = DB7_RESERVED_SET;
return 0;
}
void
save_debugreg(unsigned long *debugreg)
{
asm("mov %%db0, %0" :"=r" (debugreg[0]));
asm("mov %%db1, %0" :"=r" (debugreg[1]));
asm("mov %%db2, %0" :"=r" (debugreg[2]));
asm("mov %%db3, %0" :"=r" (debugreg[3]));
// asm("mov %%db4, %0" :"=r" (debugreg[4]));
// asm("mov %%db5, %0" :"=r" (debugreg[5]));
debugreg[4] = debugreg[5] = 0;
asm("mov %%db6, %0" :"=r" (debugreg[6]));
asm("mov %%db7, %0" :"=r" (debugreg[7]));
}
void
restore_debugreg(unsigned long *debugreg)
{
asm("mov %0, %%db0" ::"r" (debugreg[0]));
asm("mov %0, %%db1" ::"r" (debugreg[1]));
asm("mov %0, %%db2" ::"r" (debugreg[2]));
asm("mov %0, %%db3" ::"r" (debugreg[3]));
// asm("mov %0, %%db4" ::"r" (debugreg[4]));
// asm("mov %0, %%db5" ::"r" (debugreg[5]));
asm("mov %0, %%db6" ::"r" (debugreg[6]));
asm("mov %0, %%db7" ::"r" (debugreg[7]));
}
void
clear_debugreg(void)
{
unsigned long r = 0;
asm("mov %0, %%db0" ::"r" (r));
asm("mov %0, %%db1" ::"r" (r));
asm("mov %0, %%db2" ::"r" (r));
asm("mov %0, %%db3" ::"r" (r));
// asm("mov %0, %%db4" ::"r" (r));
// asm("mov %0, %%db5" ::"r" (r));
r = DB6_RESERVED_SET;
asm("mov %0, %%db6" ::"r" (r));
r = DB7_RESERVED_SET;
asm("mov %0, %%db7" ::"r" (r));
}
void clear_single_step(struct thread *thread)
{
thread->uctx->gpr.rflags &= ~RFLAGS_TF;
}
void set_single_step(struct thread *thread)
{
thread->uctx->gpr.rflags |= RFLAGS_TF;
}
long ptrace_read_fpregs(struct thread *thread, void *fpregs)
{
save_fp_regs(thread);
if (thread->fp_regs == NULL) {
return -ENOMEM;
}
return copy_to_user(fpregs, &thread->fp_regs->i387,
sizeof(struct i387_fxsave_struct));
}
long ptrace_write_fpregs(struct thread *thread, void *fpregs)
{
save_fp_regs(thread);
if (thread->fp_regs == NULL) {
return -ENOMEM;
}
return copy_from_user(&thread->fp_regs->i387, fpregs,
sizeof(struct i387_fxsave_struct));
}
long ptrace_read_regset(struct thread *thread, long type, struct iovec *iov)
{
long rc = -EINVAL;
switch (type) {
case NT_X86_XSTATE:
save_fp_regs(thread);
if (thread->fp_regs == NULL) {
return -ENOMEM;
}
if (iov->iov_len > sizeof(fp_regs_struct)) {
iov->iov_len = sizeof(fp_regs_struct);
}
rc = copy_to_user(iov->iov_base, thread->fp_regs, iov->iov_len);
break;
default:
kprintf("ptrace_read_regset: not supported type 0x%x\n", type);
break;
}
return rc;
}
long ptrace_write_regset(struct thread *thread, long type, struct iovec *iov)
{
long rc = -EINVAL;
switch (type) {
case NT_X86_XSTATE:
save_fp_regs(thread);
if (thread->fp_regs == NULL) {
return -ENOMEM;
}
if (iov->iov_len > sizeof(fp_regs_struct)) {
iov->iov_len = sizeof(fp_regs_struct);
}
rc = copy_from_user(thread->fp_regs, iov->iov_base, iov->iov_len);
break;
default:
kprintf("ptrace_write_regset: not supported type 0x%x\n", type);
break;
}
return rc;
}
extern void coredump(struct thread *thread, void *regs);
void ptrace_report_signal(struct thread *thread, int sig)
{
struct mcs_rwlock_node_irqsave lock;
struct process *proc = thread->proc;
int parent_pid;
struct siginfo info;
dkprintf("ptrace_report_signal,pid=%d\n", thread->proc->pid);
mcs_rwlock_writer_lock(&proc->update_lock, &lock);
if(!(proc->ptrace & PT_TRACED)){
mcs_rwlock_writer_unlock(&proc->update_lock, &lock);
return;
}
proc->exit_status = sig;
/* Transition thread state */
proc->pstatus = PS_TRACED;
thread->tstatus = PS_TRACED;
proc->ptrace &= ~PT_TRACE_SYSCALL_MASK;
if (sig == SIGSTOP || sig == SIGTSTP ||
sig == SIGTTIN || sig == SIGTTOU) {
proc->signal_flags |= SIGNAL_STOP_STOPPED;
} else {
proc->signal_flags &= ~SIGNAL_STOP_STOPPED;
}
parent_pid = proc->parent->pid;
mcs_rwlock_writer_unlock(&proc->update_lock, &lock);
memset(&info, '\0', sizeof info);
info.si_signo = SIGCHLD;
info.si_code = CLD_TRAPPED;
info._sifields._sigchld.si_pid = thread->proc->pid;
info._sifields._sigchld.si_status = thread->proc->exit_status;
do_kill(cpu_local_var(current), parent_pid, -1, SIGCHLD, &info, 0);
/* Wake parent (if sleeping in wait4()) */
waitq_wakeup(&proc->parent->waitpid_q);
dkprintf("ptrace_report_signal,sleeping\n");
/* Sleep */
schedule();
dkprintf("ptrace_report_signal,wake up\n");
}
static int
isrestart(int num, unsigned long rc, int sig, int restart)
{
if(sig == SIGKILL || sig == SIGSTOP)
return 0;
if(num == 0 || rc != -EINTR)
return 0;
switch(num){
case __NR_pause:
case __NR_rt_sigsuspend:
case __NR_rt_sigtimedwait:
// case __NR_rt_sigwaitinfo:
case __NR_epoll_wait:
case __NR_epoll_pwait:
case __NR_poll:
case __NR_ppoll:
case __NR_select:
case __NR_pselect6:
case __NR_msgrcv:
case __NR_msgsnd:
case __NR_semop:
case __NR_semtimedop:
case __NR_clock_nanosleep:
case __NR_nanosleep:
// case __NR_usleep:
case __NR_io_getevents:
return 0;
}
if(sig == SIGCHLD)
return 1;
if(restart)
return 1;
return 0;
}
void
do_signal(unsigned long rc, void *regs0, struct thread *thread, struct sig_pending *pending, int num)
{
struct x86_user_context *regs = regs0;
struct k_sigaction *k;
int sig;
__sigset_t w;
struct process *proc = thread->proc;
int orgsig;
int ptraceflag = 0;
struct mcs_rwlock_node_irqsave lock;
unsigned long irqstate;
for(w = pending->sigmask.__val[0], sig = 0; w; sig++, w >>= 1);
dkprintf("do_signal,pid=%d,sig=%d\n", proc->pid, sig);
orgsig = sig;
if((proc->ptrace & PT_TRACED) &&
pending->ptracecont == 0 &&
sig != SIGKILL) {
ptraceflag = 1;
sig = SIGSTOP;
}
if(regs == NULL){ /* call from syscall */
asm("movq %%gs:132, %0" : "=r" (regs));
--regs;
}
else{
rc = regs->gpr.rax;
}
irqstate = ihk_mc_spinlock_lock(&thread->sigcommon->lock);
k = thread->sigcommon->action + sig - 1;
if(k->sa.sa_handler == SIG_IGN){
kfree(pending);
ihk_mc_spinlock_unlock(&thread->sigcommon->lock, irqstate);
return;
}
else if(k->sa.sa_handler){
unsigned long *usp; /* user stack */
struct sigsp *sigsp;
int ssflags = thread->sigstack.ss_flags;
unsigned long mask = (unsigned long)thread->sigmask.__val[0];
if((k->sa.sa_flags & SA_ONSTACK) &&
!(thread->sigstack.ss_flags & SS_DISABLE) &&
!(thread->sigstack.ss_flags & SS_ONSTACK)){
unsigned long lsp;
lsp = ((unsigned long)(((char *)thread->sigstack.ss_sp) + thread->sigstack.ss_size)) & 0xfffffffffffffff8UL;
usp = (unsigned long *)lsp;
thread->sigstack.ss_flags |= SS_ONSTACK;
}
else{
usp = (unsigned long *)regs->gpr.rsp;
}
sigsp = ((struct sigsp *)usp) - 1;
sigsp = (struct sigsp *)((unsigned long)sigsp & 0xfffffffffffffff0UL);
if(write_process_vm(thread->vm, &sigsp->regs, regs, sizeof(struct x86_user_context)) ||
write_process_vm(thread->vm, &sigsp->sigrc, &rc, sizeof(long))){
kfree(pending);
ihk_mc_spinlock_unlock(&thread->sigcommon->lock, irqstate);
kprintf("do_signal,write_process_vm failed\n");
terminate(0, sig);
return;
}
sigsp->sigmask = mask;
sigsp->ssflags = ssflags;
sigsp->num = num;
sigsp->restart = isrestart(num, rc, sig, k->sa.sa_flags & SA_RESTART);
if(num != 0 && rc == -EINTR && sig == SIGCHLD)
sigsp->restart = 1;
memcpy(&sigsp->info, &pending->info, sizeof(siginfo_t));
usp = (unsigned long *)sigsp;
usp--;
*usp = (unsigned long)k->sa.sa_restorer;
regs->gpr.rdi = (unsigned long)sig;
if(k->sa.sa_flags & SA_SIGINFO){
regs->gpr.rsi = (unsigned long)&sigsp->info;
regs->gpr.rdx = 0;
}
regs->gpr.rip = (unsigned long)k->sa.sa_handler;
regs->gpr.rsp = (unsigned long)usp;
thread->sigmask.__val[0] |= pending->sigmask.__val[0];
kfree(pending);
ihk_mc_spinlock_unlock(&thread->sigcommon->lock, irqstate);
}
else {
int coredumped = 0;
siginfo_t info;
if(ptraceflag){
if(thread->ptrace_recvsig)
kfree(thread->ptrace_recvsig);
thread->ptrace_recvsig = pending;
if(thread->ptrace_sendsig)
kfree(thread->ptrace_sendsig);
thread->ptrace_sendsig = NULL;
}
else
kfree(pending);
ihk_mc_spinlock_unlock(&thread->sigcommon->lock, irqstate);
switch (sig) {
case SIGSTOP:
case SIGTSTP:
case SIGTTIN:
case SIGTTOU:
memset(&info, '\0', sizeof info);
info.si_signo = SIGCHLD;
info.si_code = CLD_STOPPED;
info._sifields._sigchld.si_pid = thread->proc->pid;
info._sifields._sigchld.si_status = (sig << 8) | 0x7f;
do_kill(cpu_local_var(current), thread->proc->parent->pid, -1, SIGCHLD, &info, 0);
if(ptraceflag){
ptrace_report_signal(thread, orgsig);
}
else{
dkprintf("do_signal,SIGSTOP,changing state\n");
/* Update thread state in fork tree */
mcs_rwlock_writer_lock(&proc->update_lock, &lock);
proc->group_exit_status = SIGSTOP;
/* Reap and set new signal_flags */
proc->signal_flags = SIGNAL_STOP_STOPPED;
proc->pstatus = PS_STOPPED;
thread->tstatus = PS_STOPPED;
mcs_rwlock_writer_unlock(&proc->update_lock, &lock);
/* Wake up the parent who tried wait4 and sleeping */
waitq_wakeup(&proc->parent->waitpid_q);
dkprintf("do_signal,SIGSTOP,sleeping\n");
/* Sleep */
schedule();
dkprintf("SIGSTOP(): woken up\n");
}
break;
case SIGTRAP:
dkprintf("do_signal,SIGTRAP\n");
if(!(proc->ptrace & PT_TRACED)) {
goto core;
}
/* Update thread state in fork tree */
mcs_rwlock_writer_lock(&proc->update_lock, &lock);
proc->exit_status = SIGTRAP;
proc->pstatus = PS_TRACED;
thread->tstatus = PS_TRACED;
mcs_rwlock_writer_unlock(&proc->update_lock, &lock);
/* Wake up the parent who tried wait4 and sleeping */
waitq_wakeup(&thread->proc->parent->waitpid_q);
/* Sleep */
dkprintf("do_signal,SIGTRAP,sleeping\n");
schedule();
dkprintf("SIGTRAP(): woken up\n");
break;
case SIGCONT:
memset(&info, '\0', sizeof info);
info.si_signo = SIGCHLD;
info.si_code = CLD_CONTINUED;
info._sifields._sigchld.si_pid = proc->pid;
info._sifields._sigchld.si_status = 0x0000ffff;
do_kill(cpu_local_var(current), proc->parent->pid, -1, SIGCHLD, &info, 0);
proc->signal_flags = SIGNAL_STOP_CONTINUED;
dkprintf("do_signal,SIGCONT,do nothing\n");
break;
case SIGQUIT:
case SIGILL:
case SIGABRT:
case SIGFPE:
case SIGSEGV:
case SIGBUS:
case SIGSYS:
core:
dkprintf("do_signal,default,core,sig=%d\n", sig);
coredump(thread, regs);
coredumped = 0x80;
terminate(0, sig | coredumped);
break;
case SIGCHLD:
case SIGURG:
break;
default:
dkprintf("do_signal,default,terminate,sig=%d\n", sig);
terminate(0, sig);
break;
}
}
}
static struct sig_pending *
getsigpending(struct thread *thread, int delflag){
struct list_head *head;
ihk_spinlock_t *lock;
struct sig_pending *next;
struct sig_pending *pending;
__sigset_t w;
int irqstate;
__sigset_t x;
int sig;
struct k_sigaction *k;
w = thread->sigmask.__val[0];
lock = &thread->sigcommon->lock;
head = &thread->sigcommon->sigpending;
for(;;){
irqstate = ihk_mc_spinlock_lock(lock);
list_for_each_entry_safe(pending, next, head, list){
for(x = pending->sigmask.__val[0], sig = 0; x; sig++, x >>= 1);
k = thread->sigcommon->action + sig - 1;
if(delflag ||
(sig != SIGCHLD && sig != SIGURG) ||
(k->sa.sa_handler != (void *)1 &&
k->sa.sa_handler != NULL)){
if(!(pending->sigmask.__val[0] & w)){
if(delflag)
list_del(&pending->list);
ihk_mc_spinlock_unlock(lock, irqstate);
return pending;
}
}
}
ihk_mc_spinlock_unlock(lock, irqstate);
if(lock == &thread->sigpendinglock)
return NULL;
lock = &thread->sigpendinglock;
head = &thread->sigpending;
}
return NULL;
}
struct sig_pending *
hassigpending(struct thread *thread)
{
return getsigpending(thread, 0);
}
void
check_signal(unsigned long rc, void *regs0, int num)
{
struct x86_user_context *regs = regs0;
struct thread *thread;
struct sig_pending *pending;
int irqstate;
if(clv == NULL)
return;
thread = cpu_local_var(current);
if(thread == NULL || thread == &cpu_local_var(idle)){
struct thread *t;
irqstate = ihk_mc_spinlock_lock(&(cpu_local_var(runq_lock)));
list_for_each_entry(t, &(cpu_local_var(runq)), sched_list){
if(t == &cpu_local_var(idle))
continue;
if(t->tstatus == PS_INTERRUPTIBLE &&
hassigpending(t)){
t->tstatus = PS_RUNNING;
break;
}
}
ihk_mc_spinlock_unlock(&(cpu_local_var(runq_lock)), irqstate);
return;
}
if(regs != NULL && (regs->gpr.rsp & 0x8000000000000000)) {
return;
}
for(;;){
pending = getsigpending(thread, 1);
if(!pending) {
dkprintf("check_signal,queue is empty\n");
return;
}
do_signal(rc, regs, thread, pending, num);
}
}
unsigned long
do_kill(struct thread *thread, int pid, int tid, int sig, siginfo_t *info,
int ptracecont)
{
dkprintf("do_kill,pid=%d,tid=%d,sig=%d\n", pid, tid, sig);
struct thread *t;
struct process *tproc;
struct process *proc = thread? thread->proc: NULL;
struct thread *tthread = NULL;
int i;
__sigset_t mask;
ihk_spinlock_t *savelock = NULL;
struct list_head *head = NULL;
int rc;
unsigned long irqstate = 0;
struct k_sigaction *k;
int doint;
int found = 0;
siginfo_t info0;
struct resource_set *rset = cpu_local_var(resource_set);
int hash;
struct thread_hash *thash = rset->thread_hash;
struct process_hash *phash = rset->process_hash;
struct mcs_rwlock_node lock;
struct mcs_rwlock_node updatelock;
if(sig > 64 || sig < 0)
return -EINVAL;
if(info == NULL){
memset(&info0, '\0', sizeof info0);
info = &info0;
info0.si_signo = sig;
info0.si_code = SI_KERNEL;
}
if(tid == -1 && pid <= 0){
struct process *p;
struct mcs_rwlock_node_irqsave slock;
int pgid = -pid;
int rc = -ESRCH;
int *pids;
int n = 0;
int sendme = 0;
if(pid == 0){
if(thread == NULL || thread->proc->pid <= 0)
return -ESRCH;
pgid = thread->proc->pgid;
}
pids = kmalloc(sizeof(int) * num_processors, IHK_MC_AP_NOWAIT);
if(!pids)
return -ENOMEM;
for(i = 0; i < HASH_SIZE; i++){
mcs_rwlock_reader_lock(&phash->lock[i], &slock);
list_for_each_entry(p, &phash->list[i], hash_list){
if(pgid != 1 && p->pgid != pgid)
continue;
if(thread && p->pid == thread->proc->pid){
sendme = 1;
continue;
}
pids[n] = p->pid;
n++;
}
mcs_rwlock_reader_unlock(&phash->lock[i], &slock);
}
for(i = 0; i < n; i++)
rc = do_kill(thread, pids[i], -1, sig, info, ptracecont);
if(sendme)
rc = do_kill(thread, thread->proc->pid, -1, sig, info, ptracecont);
kfree(pids);
return rc;
}
irqstate = cpu_disable_interrupt_save();
mask = __sigmask(sig);
if(tid == -1){
struct thread *tthread0 = NULL;
struct mcs_rwlock_node plock;
struct mcs_rwlock_node updatelock;
found = 0;
hash = process_hash(pid);
mcs_rwlock_reader_lock_noirq(&phash->lock[hash], &plock);
list_for_each_entry(tproc, &phash->list[hash], hash_list){
if(tproc->pid == pid){
found = 1;
break;
}
}
if(!found){
mcs_rwlock_reader_unlock_noirq(&phash->lock[hash], &plock);
cpu_restore_interrupt(irqstate);
return -ESRCH;
}
mcs_rwlock_reader_lock_noirq(&tproc->update_lock, &updatelock);
if(tproc->pstatus == PS_EXITED || tproc->pstatus == PS_ZOMBIE){
goto done;
}
mcs_rwlock_reader_lock_noirq(&tproc->threads_lock, &lock);
list_for_each_entry(t, &tproc->threads_list, siblings_list){
if(t->tid == pid || tthread == NULL){
if(t->tstatus == PS_EXITED){
continue;
}
if(!(mask & t->sigmask.__val[0])){
tthread = t;
found = 1;
}
else if(tthread == NULL && tthread0 == NULL){
tthread0 = t;
found = 1;
}
}
}
if(tthread == NULL){
tthread = tthread0;
}
if(tthread && tthread->tstatus != PS_EXITED){
savelock = &tthread->sigcommon->lock;
head = &tthread->sigcommon->sigpending;
hold_thread(tthread);
}
else
tthread = NULL;
mcs_rwlock_reader_unlock_noirq(&tproc->threads_lock, &lock);
done:
mcs_rwlock_reader_unlock_noirq(&tproc->update_lock, &updatelock);
mcs_rwlock_reader_unlock_noirq(&phash->lock[hash], &plock);
}
else{
found = 0;
hash = thread_hash(tid);
mcs_rwlock_reader_lock_noirq(&thash->lock[hash], &lock);
list_for_each_entry(tthread, &thash->list[hash], hash_list){
if(pid != -1 && tthread->proc->pid != pid){
continue;
}
if(tthread->tid == tid){
found = 1;
break;
}
}
if(!found){
mcs_rwlock_reader_unlock_noirq(&thash->lock[hash], &lock);
cpu_restore_interrupt(irqstate);
return -ESRCH;
}
tproc = tthread->proc;
mcs_rwlock_reader_lock_noirq(&tproc->update_lock, &updatelock);
savelock = &tthread->sigpendinglock;
head = &tthread->sigpending;
if(sig == SIGKILL ||
(tproc->pstatus != PS_EXITED &&
tproc->pstatus != PS_ZOMBIE &&
tthread->tstatus != PS_EXITED)){
hold_thread(tthread);
}
else{
tthread = NULL;
}
mcs_rwlock_reader_unlock_noirq(&tproc->update_lock, &updatelock);
mcs_rwlock_reader_unlock_noirq(&thash->lock[hash], &lock);
}
if(sig != SIGCONT &&
proc &&
proc->euid != 0 &&
proc->ruid != tproc->ruid &&
proc->euid != tproc->ruid &&
proc->ruid != tproc->suid &&
proc->euid != tproc->suid){
if(tthread)
release_thread(tthread);
cpu_restore_interrupt(irqstate);
return -EPERM;
}
if(sig == 0 || tthread == NULL || tthread->tstatus == PS_EXITED){
if(tthread)
release_thread(tthread);
cpu_restore_interrupt(irqstate);
return 0;
}
doint = 0;
ihk_mc_spinlock_lock_noirq(savelock);
/* Put signal event even when handler is SIG_IGN or SIG_DFL
because target ptraced thread must call ptrace_report_signal
in check_signal */
rc = 0;
k = tthread->sigcommon->action + sig - 1;
if((sig != SIGKILL && (tproc->ptrace & PT_TRACED)) ||
(k->sa.sa_handler != (void *)1 &&
(k->sa.sa_handler != NULL ||
(sig != SIGCHLD && sig != SIGURG)))){
struct sig_pending *pending = NULL;
if (sig < 33) { // SIGRTMIN - SIGRTMAX
list_for_each_entry(pending, head, list){
if(pending->sigmask.__val[0] == mask &&
pending->ptracecont == ptracecont)
break;
}
if(&pending->list == head)
pending = NULL;
}
if(pending == NULL){
doint = 1;
pending = kmalloc(sizeof(struct sig_pending), IHK_MC_AP_NOWAIT);
if(!pending){
rc = -ENOMEM;
}
else{
pending->sigmask.__val[0] = mask;
memcpy(&pending->info, info, sizeof(siginfo_t));
pending->ptracecont = ptracecont;
if(sig == SIGKILL || sig == SIGSTOP)
list_add(&pending->list, head);
else
list_add_tail(&pending->list, head);
tthread->sigevent = 1;
}
}
}
ihk_mc_spinlock_unlock_noirq(savelock);
cpu_restore_interrupt(irqstate);
if (doint && !(mask & tthread->sigmask.__val[0])) {
int cpuid = tthread->cpu_id;
int pid = tproc->pid;
int status = tthread->tstatus;
if (thread != tthread) {
dkprintf("do_kill,ipi,pid=%d,cpu_id=%d\n",
tproc->pid, tthread->cpu_id);
ihk_mc_interrupt_cpu(get_x86_cpu_local_variable(tthread->cpu_id)->apic_id, 0xd0);
}
if(!tthread->proc->nohost)
interrupt_syscall(pid, cpuid);
if (status != PS_RUNNING) {
if(sig == SIGKILL){
/* Wake up the target only when stopped by ptrace-reporting */
sched_wakeup_thread(tthread, PS_TRACED | PS_STOPPED);
}
else if(sig == SIGCONT || ptracecont){
/* Wake up the target only when stopped by SIGSTOP */
sched_wakeup_thread(tthread, PS_STOPPED);
}
}
}
release_thread(tthread);
return rc;
}
void
set_signal(int sig, void *regs0, siginfo_t *info)
{
struct x86_user_context *regs = regs0;
struct thread *thread = cpu_local_var(current);
if(thread == NULL || thread->proc->pid == 0)
return;
if((__sigmask(sig) & thread->sigmask.__val[0]) ||
(regs->gpr.rsp & 0x8000000000000000)){
coredump(thread, regs0);
terminate(0, sig | 0x80);
}
do_kill(thread, thread->proc->pid, thread->tid, sig, info, 0);
}
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