static void
cloudabi32_set_syscall_retval(struct thread *td, int error)
{
struct trapframe *frame = td->td_frame;
switch (error) {
case 0:
/*
* System call succeeded.
*
* Simply copy out the 64-bit return values into the
* same buffer provided for system call arguments. The
* vDSO will copy them to the right spot, truncating
* pointers and size_t values to 32 bits.
*/
frame->tf_rax = copyout(td->td_retval, (void *)frame->tf_rcx,
sizeof(td->td_retval)) == 0 ? 0 : CLOUDABI_EFAULT;
break;
case ERESTART:
/* Restart system call. */
frame->tf_rip -= frame->tf_err;
frame->tf_r10 = frame->tf_rcx;
set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
break;
case EJUSTRETURN:
break;
default:
/* System call returned an error. */
frame->tf_rax = cloudabi_convert_errno(error);
break;
}
}
/*
* Set machine context.
*
* However, we don't set any but the user modifiable flags, and we won't
* touch the cs selector.
*/
static int
ia32_set_mcontext(struct thread *td, const struct ia32_mcontext *mcp)
{
struct trapframe *tp;
long rflags;
int ret;
tp = td->td_frame;
if (mcp->mc_len != sizeof(*mcp))
return (EINVAL);
rflags = (mcp->mc_eflags & PSL_USERCHANGE) |
(tp->tf_rflags & ~PSL_USERCHANGE);
ret = ia32_set_fpcontext(td, mcp);
if (ret != 0)
return (ret);
tp->tf_gs = mcp->mc_gs;
tp->tf_fs = mcp->mc_fs;
tp->tf_es = mcp->mc_es;
tp->tf_ds = mcp->mc_ds;
tp->tf_flags = TF_HASSEGS;
tp->tf_rdi = mcp->mc_edi;
tp->tf_rsi = mcp->mc_esi;
tp->tf_rbp = mcp->mc_ebp;
tp->tf_rbx = mcp->mc_ebx;
tp->tf_rdx = mcp->mc_edx;
tp->tf_rcx = mcp->mc_ecx;
tp->tf_rax = mcp->mc_eax;
/* trapno, err */
tp->tf_rip = mcp->mc_eip;
tp->tf_rflags = rflags;
tp->tf_rsp = mcp->mc_esp;
tp->tf_ss = mcp->mc_ss;
set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
return (0);
}
int
set_regs32(struct thread *td, struct reg32 *regs)
{
struct pcb *pcb;
struct trapframe *tp;
tp = td->td_frame;
if (!EFL_SECURE(regs->r_eflags, tp->tf_rflags) || !CS_SECURE(regs->r_cs))
return (EINVAL);
pcb = td->td_pcb;
tp->tf_gs = regs->r_gs;
tp->tf_fs = regs->r_fs;
tp->tf_es = regs->r_es;
tp->tf_ds = regs->r_ds;
set_pcb_flags(pcb, PCB_FULL_IRET);
tp->tf_flags = TF_HASSEGS;
tp->tf_rdi = regs->r_edi;
tp->tf_rsi = regs->r_esi;
tp->tf_rbp = regs->r_ebp;
tp->tf_rbx = regs->r_ebx;
tp->tf_rdx = regs->r_edx;
tp->tf_rcx = regs->r_ecx;
tp->tf_rax = regs->r_eax;
tp->tf_rip = regs->r_eip;
tp->tf_cs = regs->r_cs;
tp->tf_rflags = regs->r_eflags;
tp->tf_rsp = regs->r_esp;
tp->tf_ss = regs->r_ss;
return (0);
}
/*
* Reset registers to default values on exec.
*/
static void
linux_exec_setregs(struct thread *td, struct image_params *imgp, u_long stack)
{
struct trapframe *regs = td->td_frame;
struct pcb *pcb = td->td_pcb;
mtx_lock(&dt_lock);
if (td->td_proc->p_md.md_ldt != NULL)
user_ldt_free(td);
else
mtx_unlock(&dt_lock);
pcb->pcb_fsbase = 0;
pcb->pcb_gsbase = 0;
clear_pcb_flags(pcb, PCB_32BIT);
pcb->pcb_initial_fpucw = __LINUX_NPXCW__;
set_pcb_flags(pcb, PCB_FULL_IRET);
bzero((char *)regs, sizeof(struct trapframe));
regs->tf_rip = imgp->entry_addr;
regs->tf_rsp = stack;
regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T);
regs->tf_ss = _udatasel;
regs->tf_cs = _ucodesel;
regs->tf_ds = _udatasel;
regs->tf_es = _udatasel;
regs->tf_fs = _ufssel;
regs->tf_gs = _ugssel;
regs->tf_flags = TF_HASSEGS;
/*
* Reset the hardware debug registers if they were in use.
* They won't have any meaning for the newly exec'd process.
*/
if (pcb->pcb_flags & PCB_DBREGS) {
pcb->pcb_dr0 = 0;
pcb->pcb_dr1 = 0;
pcb->pcb_dr2 = 0;
pcb->pcb_dr3 = 0;
pcb->pcb_dr6 = 0;
pcb->pcb_dr7 = 0;
if (pcb == curpcb) {
/*
* Clear the debug registers on the running
* CPU, otherwise they will end up affecting
* the next process we switch to.
*/
reset_dbregs();
}
clear_pcb_flags(pcb, PCB_DBREGS);
}
/*
* Drop the FP state if we hold it, so that the process gets a
* clean FP state if it uses the FPU again.
*/
fpstate_drop(td);
}
int
ofreebsd32_sigreturn(struct thread *td, struct ofreebsd32_sigreturn_args *uap)
{
struct ia32_sigcontext3 sc, *scp;
struct trapframe *regs;
int eflags, error;
ksiginfo_t ksi;
regs = td->td_frame;
error = copyin(uap->sigcntxp, &sc, sizeof(sc));
if (error != 0)
return (error);
scp = ≻
eflags = scp->sc_eflags;
if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) {
return (EINVAL);
}
if (!CS_SECURE(scp->sc_cs)) {
ksiginfo_init_trap(&ksi);
ksi.ksi_signo = SIGBUS;
ksi.ksi_code = BUS_OBJERR;
ksi.ksi_trapno = T_PROTFLT;
ksi.ksi_addr = (void *)regs->tf_rip;
trapsignal(td, &ksi);
return (EINVAL);
}
regs->tf_ds = scp->sc_ds;
regs->tf_es = scp->sc_es;
regs->tf_fs = scp->sc_fs;
regs->tf_gs = scp->sc_gs;
regs->tf_rax = scp->sc_eax;
regs->tf_rbx = scp->sc_ebx;
regs->tf_rcx = scp->sc_ecx;
regs->tf_rdx = scp->sc_edx;
regs->tf_rsi = scp->sc_esi;
regs->tf_rdi = scp->sc_edi;
regs->tf_cs = scp->sc_cs;
regs->tf_ss = scp->sc_ss;
regs->tf_rbp = scp->sc_ebp;
regs->tf_rsp = scp->sc_esp;
regs->tf_rip = scp->sc_eip;
regs->tf_rflags = eflags;
if (scp->sc_onstack & 1)
td->td_sigstk.ss_flags |= SS_ONSTACK;
else
td->td_sigstk.ss_flags &= ~SS_ONSTACK;
kern_sigprocmask(td, SIG_SETMASK, (sigset_t *)&scp->sc_mask, NULL,
SIGPROCMASK_OLD);
set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
return (EJUSTRETURN);
}
/*
* Set machine context.
*
* However, we don't set any but the user modifiable flags, and we won't
* touch the cs selector.
*/
static int
ia32_set_mcontext(struct thread *td, const struct ia32_mcontext *mcp)
{
struct trapframe *tp;
char *xfpustate;
long rflags;
int ret;
tp = td->td_frame;
if (mcp->mc_len != sizeof(*mcp))
return (EINVAL);
rflags = (mcp->mc_eflags & PSL_USERCHANGE) |
(tp->tf_rflags & ~PSL_USERCHANGE);
if (mcp->mc_flags & _MC_IA32_HASFPXSTATE) {
if (mcp->mc_xfpustate_len > cpu_max_ext_state_size -
sizeof(struct savefpu))
return (EINVAL);
xfpustate = __builtin_alloca(mcp->mc_xfpustate_len);
ret = copyin(PTRIN(mcp->mc_xfpustate), xfpustate,
mcp->mc_xfpustate_len);
if (ret != 0)
return (ret);
} else
xfpustate = NULL;
ret = ia32_set_fpcontext(td, mcp, xfpustate, mcp->mc_xfpustate_len);
if (ret != 0)
return (ret);
tp->tf_gs = mcp->mc_gs;
tp->tf_fs = mcp->mc_fs;
tp->tf_es = mcp->mc_es;
tp->tf_ds = mcp->mc_ds;
tp->tf_flags = TF_HASSEGS;
tp->tf_rdi = mcp->mc_edi;
tp->tf_rsi = mcp->mc_esi;
tp->tf_rbp = mcp->mc_ebp;
tp->tf_rbx = mcp->mc_ebx;
tp->tf_rdx = mcp->mc_edx;
tp->tf_rcx = mcp->mc_ecx;
tp->tf_rax = mcp->mc_eax;
/* trapno, err */
tp->tf_rip = mcp->mc_eip;
tp->tf_rflags = rflags;
tp->tf_rsp = mcp->mc_esp;
tp->tf_ss = mcp->mc_ss;
set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
return (0);
}
/*
* Get machine context.
*/
static int
ia32_get_mcontext(struct thread *td, struct ia32_mcontext *mcp, int flags)
{
struct pcb *pcb;
struct trapframe *tp;
pcb = td->td_pcb;
tp = td->td_frame;
PROC_LOCK(curthread->td_proc);
mcp->mc_onstack = sigonstack(tp->tf_rsp);
PROC_UNLOCK(curthread->td_proc);
/* Entry into kernel always sets TF_HASSEGS */
mcp->mc_gs = tp->tf_gs;
mcp->mc_fs = tp->tf_fs;
mcp->mc_es = tp->tf_es;
mcp->mc_ds = tp->tf_ds;
mcp->mc_edi = tp->tf_rdi;
mcp->mc_esi = tp->tf_rsi;
mcp->mc_ebp = tp->tf_rbp;
mcp->mc_isp = tp->tf_rsp;
mcp->mc_eflags = tp->tf_rflags;
if (flags & GET_MC_CLEAR_RET) {
mcp->mc_eax = 0;
mcp->mc_edx = 0;
mcp->mc_eflags &= ~PSL_C;
} else {
mcp->mc_eax = tp->tf_rax;
mcp->mc_edx = tp->tf_rdx;
}
mcp->mc_ebx = tp->tf_rbx;
mcp->mc_ecx = tp->tf_rcx;
mcp->mc_eip = tp->tf_rip;
mcp->mc_cs = tp->tf_cs;
mcp->mc_esp = tp->tf_rsp;
mcp->mc_ss = tp->tf_ss;
mcp->mc_len = sizeof(*mcp);
mcp->mc_flags = tp->tf_flags;
ia32_get_fpcontext(td, mcp, NULL, 0);
mcp->mc_fsbase = pcb->pcb_fsbase;
mcp->mc_gsbase = pcb->pcb_gsbase;
mcp->mc_xfpustate = 0;
mcp->mc_xfpustate_len = 0;
bzero(mcp->mc_spare2, sizeof(mcp->mc_spare2));
set_pcb_flags(pcb, PCB_FULL_IRET);
return (0);
}
static void
linux_set_syscall_retval(struct thread *td, int error)
{
struct trapframe *frame = td->td_frame;
/*
* On Linux only %rcx and %r11 values are not preserved across
* the syscall.
* So, do not clobber %rdx and %r10
*/
td->td_retval[1] = frame->tf_rdx;
frame->tf_r10 = frame->tf_rcx;
cpu_set_syscall_retval(td, error);
/* Restore all registers. */
set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
}
int
cpu_set_user_tls(struct thread *td, void *tls_base)
{
struct pcb *pcb;
if ((u_int64_t)tls_base >= VM_MAXUSER_ADDRESS)
return (EINVAL);
pcb = td->td_pcb;
set_pcb_flags(pcb, PCB_FULL_IRET);
#ifdef COMPAT_FREEBSD32
if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
pcb->pcb_gsbase = (register_t)tls_base;
return (0);
}
#endif
pcb->pcb_fsbase = (register_t)tls_base;
return (0);
}
/*
* Clear registers on exec
* XXX copied from ia32_signal.c.
*/
static void
exec_linux_setregs(struct thread *td, struct image_params *imgp, u_long stack)
{
struct trapframe *regs = td->td_frame;
struct pcb *pcb = td->td_pcb;
mtx_lock(&dt_lock);
if (td->td_proc->p_md.md_ldt != NULL)
user_ldt_free(td);
else
mtx_unlock(&dt_lock);
critical_enter();
wrmsr(MSR_FSBASE, 0);
wrmsr(MSR_KGSBASE, 0); /* User value while we're in the kernel */
pcb->pcb_fsbase = 0;
pcb->pcb_gsbase = 0;
critical_exit();
pcb->pcb_initial_fpucw = __LINUX_NPXCW__;
bzero((char *)regs, sizeof(struct trapframe));
regs->tf_rip = imgp->entry_addr;
regs->tf_rsp = stack;
regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T);
regs->tf_gs = _ugssel;
regs->tf_fs = _ufssel;
regs->tf_es = _udatasel;
regs->tf_ds = _udatasel;
regs->tf_ss = _udatasel;
regs->tf_flags = TF_HASSEGS;
regs->tf_cs = _ucode32sel;
regs->tf_rbx = imgp->ps_strings;
fpstate_drop(td);
/* Do full restore on return so that we can change to a different %cs */
set_pcb_flags(pcb, PCB_32BIT | PCB_FULL_IRET);
td->td_retval[1] = 0;
}
void
cpu_set_syscall_retval(struct thread *td, int error)
{
switch (error) {
case 0:
td->td_frame->tf_rax = td->td_retval[0];
td->td_frame->tf_rdx = td->td_retval[1];
td->td_frame->tf_rflags &= ~PSL_C;
break;
case ERESTART:
/*
* Reconstruct pc, we know that 'syscall' is 2 bytes,
* lcall $X,y is 7 bytes, int 0x80 is 2 bytes.
* We saved this in tf_err.
* %r10 (which was holding the value of %rcx) is restored
* for the next iteration.
* %r10 restore is only required for freebsd/amd64 processes,
* but shall be innocent for any ia32 ABI.
*
* Require full context restore to get the arguments
* in the registers reloaded at return to usermode.
*/
td->td_frame->tf_rip -= td->td_frame->tf_err;
td->td_frame->tf_r10 = td->td_frame->tf_rcx;
set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
break;
case EJUSTRETURN:
break;
default:
td->td_frame->tf_rax = SV_ABI_ERRNO(td->td_proc, error);
td->td_frame->tf_rflags |= PSL_C;
break;
}
}
int
vm_run(struct vm *vm, struct vm_run *vmrun)
{
int error, vcpuid;
struct vcpu *vcpu;
struct pcb *pcb;
uint64_t tscval, rip;
struct vm_exit *vme;
bool retu, intr_disabled;
pmap_t pmap;
vcpuid = vmrun->cpuid;
if (vcpuid < 0 || vcpuid >= VM_MAXCPU)
return (EINVAL);
pmap = vmspace_pmap(vm->vmspace);
vcpu = &vm->vcpu[vcpuid];
vme = &vcpu->exitinfo;
rip = vmrun->rip;
restart:
critical_enter();
KASSERT(!CPU_ISSET(curcpu, &pmap->pm_active),
("vm_run: absurd pm_active"));
tscval = rdtsc();
pcb = PCPU_GET(curpcb);
set_pcb_flags(pcb, PCB_FULL_IRET);
restore_guest_msrs(vm, vcpuid);
restore_guest_fpustate(vcpu);
vcpu_require_state(vm, vcpuid, VCPU_RUNNING);
error = VMRUN(vm->cookie, vcpuid, rip, pmap, &vm->rendezvous_func);
vcpu_require_state(vm, vcpuid, VCPU_FROZEN);
save_guest_fpustate(vcpu);
restore_host_msrs(vm, vcpuid);
vmm_stat_incr(vm, vcpuid, VCPU_TOTAL_RUNTIME, rdtsc() - tscval);
critical_exit();
if (error == 0) {
retu = false;
switch (vme->exitcode) {
case VM_EXITCODE_IOAPIC_EOI:
vioapic_process_eoi(vm, vcpuid,
vme->u.ioapic_eoi.vector);
break;
case VM_EXITCODE_RENDEZVOUS:
vm_handle_rendezvous(vm, vcpuid);
error = 0;
break;
case VM_EXITCODE_HLT:
intr_disabled = ((vme->u.hlt.rflags & PSL_I) == 0);
error = vm_handle_hlt(vm, vcpuid, intr_disabled, &retu);
break;
case VM_EXITCODE_PAGING:
error = vm_handle_paging(vm, vcpuid, &retu);
break;
case VM_EXITCODE_INST_EMUL:
error = vm_handle_inst_emul(vm, vcpuid, &retu);
break;
default:
retu = true; /* handled in userland */
break;
}
}
if (error == 0 && retu == false) {
rip = vme->rip + vme->inst_length;
goto restart;
}
/* copy the exit information */
bcopy(vme, &vmrun->vm_exit, sizeof(struct vm_exit));
return (error);
}
/*
* copied from amd64/amd64/machdep.c
*
* Send an interrupt to process.
*/
static void
linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
{
struct l_rt_sigframe sf, *sfp;
struct proc *p;
struct thread *td;
struct sigacts *psp;
caddr_t sp;
struct trapframe *regs;
int sig, code;
int oonstack;
td = curthread;
p = td->td_proc;
PROC_LOCK_ASSERT(p, MA_OWNED);
sig = ksi->ksi_signo;
psp = p->p_sigacts;
code = ksi->ksi_code;
mtx_assert(&psp->ps_mtx, MA_OWNED);
regs = td->td_frame;
oonstack = sigonstack(regs->tf_rsp);
LINUX_CTR4(rt_sendsig, "%p, %d, %p, %u",
catcher, sig, mask, code);
/* Allocate space for the signal handler context. */
if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
SIGISMEMBER(psp->ps_sigonstack, sig)) {
sp = (caddr_t)td->td_sigstk.ss_sp + td->td_sigstk.ss_size -
sizeof(struct l_rt_sigframe);
} else
sp = (caddr_t)regs->tf_rsp - sizeof(struct l_rt_sigframe) - 128;
/* Align to 16 bytes. */
sfp = (struct l_rt_sigframe *)((unsigned long)sp & ~0xFul);
mtx_unlock(&psp->ps_mtx);
/* Translate the signal. */
sig = bsd_to_linux_signal(sig);
/* Save user context. */
bzero(&sf, sizeof(sf));
bsd_to_linux_sigset(mask, &sf.sf_sc.uc_sigmask);
bsd_to_linux_sigset(mask, &sf.sf_sc.uc_mcontext.sc_mask);
sf.sf_sc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp);
sf.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size;
sf.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE;
PROC_UNLOCK(p);
sf.sf_sc.uc_mcontext.sc_rdi = regs->tf_rdi;
sf.sf_sc.uc_mcontext.sc_rsi = regs->tf_rsi;
sf.sf_sc.uc_mcontext.sc_rdx = regs->tf_rdx;
sf.sf_sc.uc_mcontext.sc_rbp = regs->tf_rbp;
sf.sf_sc.uc_mcontext.sc_rbx = regs->tf_rbx;
sf.sf_sc.uc_mcontext.sc_rcx = regs->tf_rcx;
sf.sf_sc.uc_mcontext.sc_rax = regs->tf_rax;
sf.sf_sc.uc_mcontext.sc_rip = regs->tf_rip;
sf.sf_sc.uc_mcontext.sc_rsp = regs->tf_rsp;
sf.sf_sc.uc_mcontext.sc_r8 = regs->tf_r8;
sf.sf_sc.uc_mcontext.sc_r9 = regs->tf_r9;
sf.sf_sc.uc_mcontext.sc_r10 = regs->tf_r10;
sf.sf_sc.uc_mcontext.sc_r11 = regs->tf_r11;
sf.sf_sc.uc_mcontext.sc_r12 = regs->tf_r12;
sf.sf_sc.uc_mcontext.sc_r13 = regs->tf_r13;
sf.sf_sc.uc_mcontext.sc_r14 = regs->tf_r14;
sf.sf_sc.uc_mcontext.sc_r15 = regs->tf_r15;
sf.sf_sc.uc_mcontext.sc_cs = regs->tf_cs;
sf.sf_sc.uc_mcontext.sc_rflags = regs->tf_rflags;
sf.sf_sc.uc_mcontext.sc_err = regs->tf_err;
sf.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code);
sf.sf_sc.uc_mcontext.sc_cr2 = (register_t)ksi->ksi_addr;
/* Build the argument list for the signal handler. */
regs->tf_rdi = sig; /* arg 1 in %rdi */
regs->tf_rax = 0;
regs->tf_rsi = (register_t)&sfp->sf_si; /* arg 2 in %rsi */
regs->tf_rdx = (register_t)&sfp->sf_sc; /* arg 3 in %rdx */
sf.sf_handler = catcher;
/* Fill in POSIX parts */
ksiginfo_to_lsiginfo(ksi, &sf.sf_si, sig);
/*
* Copy the sigframe out to the user's stack.
*/
if (copyout(&sf, sfp, sizeof(*sfp)) != 0) {
#ifdef DEBUG
printf("process %ld has trashed its stack\n", (long)p->p_pid);
#endif
PROC_LOCK(p);
sigexit(td, SIGILL);
}
regs->tf_rsp = (long)sfp;
regs->tf_rip = linux_rt_sigcode;
regs->tf_rflags &= ~(PSL_T | PSL_D);
regs->tf_cs = _ucodesel;
set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
PROC_LOCK(p);
mtx_lock(&psp->ps_mtx);
}
/*
* Copied from amd64/amd64/machdep.c
*
* XXX fpu state need? don't think so
*/
int
linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args)
{
struct proc *p;
struct l_ucontext uc;
struct l_sigcontext *context;
struct trapframe *regs;
unsigned long rflags;
int error;
ksiginfo_t ksi;
regs = td->td_frame;
error = copyin((void *)regs->tf_rbx, &uc, sizeof(uc));
if (error != 0)
return (error);
p = td->td_proc;
context = &uc.uc_mcontext;
rflags = context->sc_rflags;
/*
* Don't allow users to change privileged or reserved flags.
*/
/*
* XXX do allow users to change the privileged flag PSL_RF.
* The cpu sets PSL_RF in tf_rflags for faults. Debuggers
* should sometimes set it there too. tf_rflags is kept in
* the signal context during signal handling and there is no
* other place to remember it, so the PSL_RF bit may be
* corrupted by the signal handler without us knowing.
* Corruption of the PSL_RF bit at worst causes one more or
* one less debugger trap, so allowing it is fairly harmless.
*/
#define RFLAG_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
if (!RFLAG_SECURE(rflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) {
printf("linux_rt_sigreturn: rflags = 0x%lx\n", rflags);
return (EINVAL);
}
/*
* Don't allow users to load a valid privileged %cs. Let the
* hardware check for invalid selectors, excess privilege in
* other selectors, invalid %eip's and invalid %esp's.
*/
#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
if (!CS_SECURE(context->sc_cs)) {
printf("linux_rt_sigreturn: cs = 0x%x\n", context->sc_cs);
ksiginfo_init_trap(&ksi);
ksi.ksi_signo = SIGBUS;
ksi.ksi_code = BUS_OBJERR;
ksi.ksi_trapno = T_PROTFLT;
ksi.ksi_addr = (void *)regs->tf_rip;
trapsignal(td, &ksi);
return (EINVAL);
}
PROC_LOCK(p);
linux_to_bsd_sigset(&uc.uc_sigmask, &td->td_sigmask);
SIG_CANTMASK(td->td_sigmask);
signotify(td);
PROC_UNLOCK(p);
regs->tf_rdi = context->sc_rdi;
regs->tf_rsi = context->sc_rsi;
regs->tf_rdx = context->sc_rdx;
regs->tf_rbp = context->sc_rbp;
regs->tf_rbx = context->sc_rbx;
regs->tf_rcx = context->sc_rcx;
regs->tf_rax = context->sc_rax;
regs->tf_rip = context->sc_rip;
regs->tf_rsp = context->sc_rsp;
regs->tf_r8 = context->sc_r8;
regs->tf_r9 = context->sc_r9;
regs->tf_r10 = context->sc_r10;
regs->tf_r11 = context->sc_r11;
regs->tf_r12 = context->sc_r12;
regs->tf_r13 = context->sc_r13;
regs->tf_r14 = context->sc_r14;
regs->tf_r15 = context->sc_r15;
regs->tf_cs = context->sc_cs;
regs->tf_err = context->sc_err;
regs->tf_rflags = rflags;
set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
return (EJUSTRETURN);
}
/*
* System call to cleanup state after a signal
* has been taken. Reset signal mask and
* stack state from context left by rt_sendsig (above).
* Return to previous pc and psl as specified by
* context left by sendsig. Check carefully to
* make sure that the user has not modified the
* psl to gain improper privileges or to cause
* a machine fault.
*/
int
linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args)
{
struct l_ucontext uc;
struct l_sigcontext *context;
sigset_t bmask;
l_stack_t *lss;
stack_t ss;
struct trapframe *regs;
int eflags;
ksiginfo_t ksi;
regs = td->td_frame;
#ifdef DEBUG
if (ldebug(rt_sigreturn))
printf(ARGS(rt_sigreturn, "%p"), (void *)args->ucp);
#endif
/*
* The trampoline code hands us the ucontext.
* It is unsafe to keep track of it ourselves, in the event that a
* program jumps out of a signal handler.
*/
if (copyin(args->ucp, &uc, sizeof(uc)) != 0)
return (EFAULT);
context = &uc.uc_mcontext;
/*
* Check for security violations.
*/
#define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
eflags = context->sc_eflags;
if (!EFLAGS_SECURE(eflags, regs->tf_rflags))
return(EINVAL);
/*
* Don't allow users to load a valid privileged %cs. Let the
* hardware check for invalid selectors, excess privilege in
* other selectors, invalid %eip's and invalid %esp's.
*/
#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
if (!CS_SECURE(context->sc_cs)) {
ksiginfo_init_trap(&ksi);
ksi.ksi_signo = SIGBUS;
ksi.ksi_code = BUS_OBJERR;
ksi.ksi_trapno = T_PROTFLT;
ksi.ksi_addr = (void *)regs->tf_rip;
trapsignal(td, &ksi);
return(EINVAL);
}
linux_to_bsd_sigset(&uc.uc_sigmask, &bmask);
kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0);
/*
* Restore signal context
*/
regs->tf_gs = context->sc_gs;
regs->tf_fs = context->sc_fs;
regs->tf_es = context->sc_es;
regs->tf_ds = context->sc_ds;
regs->tf_rdi = context->sc_edi;
regs->tf_rsi = context->sc_esi;
regs->tf_rbp = context->sc_ebp;
regs->tf_rbx = context->sc_ebx;
regs->tf_rdx = context->sc_edx;
regs->tf_rcx = context->sc_ecx;
regs->tf_rax = context->sc_eax;
regs->tf_rip = context->sc_eip;
regs->tf_cs = context->sc_cs;
regs->tf_rflags = eflags;
regs->tf_rsp = context->sc_esp_at_signal;
regs->tf_ss = context->sc_ss;
set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
/*
* call sigaltstack & ignore results..
*/
lss = &uc.uc_stack;
ss.ss_sp = PTRIN(lss->ss_sp);
ss.ss_size = lss->ss_size;
ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags);
#ifdef DEBUG
if (ldebug(rt_sigreturn))
printf(LMSG("rt_sigret flags: 0x%x, sp: %p, ss: 0x%lx, mask: 0x%x"),
ss.ss_flags, ss.ss_sp, ss.ss_size, context->sc_mask);
#endif
(void)kern_sigaltstack(td, &ss, NULL);
return (EJUSTRETURN);
}
/*
* System call to cleanup state after a signal
* has been taken. Reset signal mask and
* stack state from context left by sendsig (above).
* Return to previous pc and psl as specified by
* context left by sendsig. Check carefully to
* make sure that the user has not modified the
* psl to gain improper privileges or to cause
* a machine fault.
*/
int
linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args)
{
struct l_sigframe frame;
struct trapframe *regs;
sigset_t bmask;
l_sigset_t lmask;
int eflags, i;
ksiginfo_t ksi;
regs = td->td_frame;
#ifdef DEBUG
if (ldebug(sigreturn))
printf(ARGS(sigreturn, "%p"), (void *)args->sfp);
#endif
/*
* The trampoline code hands us the sigframe.
* It is unsafe to keep track of it ourselves, in the event that a
* program jumps out of a signal handler.
*/
if (copyin(args->sfp, &frame, sizeof(frame)) != 0)
return (EFAULT);
/*
* Check for security violations.
*/
#define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
eflags = frame.sf_sc.sc_eflags;
if (!EFLAGS_SECURE(eflags, regs->tf_rflags))
return(EINVAL);
/*
* Don't allow users to load a valid privileged %cs. Let the
* hardware check for invalid selectors, excess privilege in
* other selectors, invalid %eip's and invalid %esp's.
*/
#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
if (!CS_SECURE(frame.sf_sc.sc_cs)) {
ksiginfo_init_trap(&ksi);
ksi.ksi_signo = SIGBUS;
ksi.ksi_code = BUS_OBJERR;
ksi.ksi_trapno = T_PROTFLT;
ksi.ksi_addr = (void *)regs->tf_rip;
trapsignal(td, &ksi);
return(EINVAL);
}
lmask.__bits[0] = frame.sf_sc.sc_mask;
for (i = 0; i < (LINUX_NSIG_WORDS-1); i++)
lmask.__bits[i+1] = frame.sf_extramask[i];
linux_to_bsd_sigset(&lmask, &bmask);
kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0);
/*
* Restore signal context.
*/
regs->tf_rdi = frame.sf_sc.sc_edi;
regs->tf_rsi = frame.sf_sc.sc_esi;
regs->tf_rbp = frame.sf_sc.sc_ebp;
regs->tf_rbx = frame.sf_sc.sc_ebx;
regs->tf_rdx = frame.sf_sc.sc_edx;
regs->tf_rcx = frame.sf_sc.sc_ecx;
regs->tf_rax = frame.sf_sc.sc_eax;
regs->tf_rip = frame.sf_sc.sc_eip;
regs->tf_cs = frame.sf_sc.sc_cs;
regs->tf_ds = frame.sf_sc.sc_ds;
regs->tf_es = frame.sf_sc.sc_es;
regs->tf_fs = frame.sf_sc.sc_fs;
regs->tf_gs = frame.sf_sc.sc_gs;
regs->tf_rflags = eflags;
regs->tf_rsp = frame.sf_sc.sc_esp_at_signal;
regs->tf_ss = frame.sf_sc.sc_ss;
set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
return (EJUSTRETURN);
}
/*
* Send an interrupt to process.
*
* Stack is set up to allow sigcode stored
* in u. to call routine, followed by kcall
* to sigreturn routine below. After sigreturn
* resets the signal mask, the stack, and the
* frame pointer, it returns to the user
* specified pc, psl.
*/
static void
linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
struct sigacts *psp;
struct trapframe *regs;
struct l_sigframe *fp, frame;
l_sigset_t lmask;
int oonstack, i;
int sig, code;
sig = ksi->ksi_signo;
code = ksi->ksi_code;
PROC_LOCK_ASSERT(p, MA_OWNED);
psp = p->p_sigacts;
mtx_assert(&psp->ps_mtx, MA_OWNED);
if (SIGISMEMBER(psp->ps_siginfo, sig)) {
/* Signal handler installed with SA_SIGINFO. */
linux_rt_sendsig(catcher, ksi, mask);
return;
}
regs = td->td_frame;
oonstack = sigonstack(regs->tf_rsp);
#ifdef DEBUG
if (ldebug(sendsig))
printf(ARGS(sendsig, "%p, %d, %p, %u"),
catcher, sig, (void*)mask, code);
#endif
/*
* Allocate space for the signal handler context.
*/
if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
SIGISMEMBER(psp->ps_sigonstack, sig)) {
fp = (struct l_sigframe *)(td->td_sigstk.ss_sp +
td->td_sigstk.ss_size - sizeof(struct l_sigframe));
} else
fp = (struct l_sigframe *)regs->tf_rsp - 1;
mtx_unlock(&psp->ps_mtx);
PROC_UNLOCK(p);
/*
* Build the argument list for the signal handler.
*/
if (p->p_sysent->sv_sigtbl)
if (sig <= p->p_sysent->sv_sigsize)
sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
bzero(&frame, sizeof(frame));
frame.sf_handler = PTROUT(catcher);
frame.sf_sig = sig;
bsd_to_linux_sigset(mask, &lmask);
/*
* Build the signal context to be used by sigreturn.
*/
frame.sf_sc.sc_mask = lmask.__bits[0];
frame.sf_sc.sc_gs = regs->tf_gs;
frame.sf_sc.sc_fs = regs->tf_fs;
frame.sf_sc.sc_es = regs->tf_es;
frame.sf_sc.sc_ds = regs->tf_ds;
frame.sf_sc.sc_edi = regs->tf_rdi;
frame.sf_sc.sc_esi = regs->tf_rsi;
frame.sf_sc.sc_ebp = regs->tf_rbp;
frame.sf_sc.sc_ebx = regs->tf_rbx;
frame.sf_sc.sc_edx = regs->tf_rdx;
frame.sf_sc.sc_ecx = regs->tf_rcx;
frame.sf_sc.sc_eax = regs->tf_rax;
frame.sf_sc.sc_eip = regs->tf_rip;
frame.sf_sc.sc_cs = regs->tf_cs;
frame.sf_sc.sc_eflags = regs->tf_rflags;
frame.sf_sc.sc_esp_at_signal = regs->tf_rsp;
frame.sf_sc.sc_ss = regs->tf_ss;
frame.sf_sc.sc_err = regs->tf_err;
frame.sf_sc.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr;
frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(code);
for (i = 0; i < (LINUX_NSIG_WORDS-1); i++)
frame.sf_extramask[i] = lmask.__bits[i+1];
if (copyout(&frame, fp, sizeof(frame)) != 0) {
/*
* Process has trashed its stack; give it an illegal
* instruction to halt it in its tracks.
*/
PROC_LOCK(p);
sigexit(td, SIGILL);
}
/*
* Build context to run handler in.
*/
regs->tf_rsp = PTROUT(fp);
regs->tf_rip = p->p_sysent->sv_sigcode_base;
regs->tf_rflags &= ~(PSL_T | PSL_D);
regs->tf_cs = _ucode32sel;
regs->tf_ss = _udatasel;
regs->tf_ds = _udatasel;
regs->tf_es = _udatasel;
regs->tf_fs = _ufssel;
regs->tf_gs = _ugssel;
regs->tf_flags = TF_HASSEGS;
set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
PROC_LOCK(p);
mtx_lock(&psp->ps_mtx);
}
static void
linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
{
struct thread *td = curthread;
struct proc *p = td->td_proc;
struct sigacts *psp;
struct trapframe *regs;
struct l_rt_sigframe *fp, frame;
int oonstack;
int sig;
int code;
sig = ksi->ksi_signo;
code = ksi->ksi_code;
PROC_LOCK_ASSERT(p, MA_OWNED);
psp = p->p_sigacts;
mtx_assert(&psp->ps_mtx, MA_OWNED);
regs = td->td_frame;
oonstack = sigonstack(regs->tf_rsp);
#ifdef DEBUG
if (ldebug(rt_sendsig))
printf(ARGS(rt_sendsig, "%p, %d, %p, %u"),
catcher, sig, (void*)mask, code);
#endif
/*
* Allocate space for the signal handler context.
*/
if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
SIGISMEMBER(psp->ps_sigonstack, sig)) {
fp = (struct l_rt_sigframe *)(td->td_sigstk.ss_sp +
td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe));
} else
fp = (struct l_rt_sigframe *)regs->tf_rsp - 1;
mtx_unlock(&psp->ps_mtx);
/*
* Build the argument list for the signal handler.
*/
if (p->p_sysent->sv_sigtbl)
if (sig <= p->p_sysent->sv_sigsize)
sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
bzero(&frame, sizeof(frame));
frame.sf_handler = PTROUT(catcher);
frame.sf_sig = sig;
frame.sf_siginfo = PTROUT(&fp->sf_si);
frame.sf_ucontext = PTROUT(&fp->sf_sc);
/* Fill in POSIX parts */
ksiginfo_to_lsiginfo(ksi, &frame.sf_si, sig);
/*
* Build the signal context to be used by sigreturn.
*/
frame.sf_sc.uc_flags = 0; /* XXX ??? */
frame.sf_sc.uc_link = 0; /* XXX ??? */
frame.sf_sc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp);
frame.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size;
frame.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE;
PROC_UNLOCK(p);
bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask);
frame.sf_sc.uc_mcontext.sc_mask = frame.sf_sc.uc_sigmask.__bits[0];
frame.sf_sc.uc_mcontext.sc_edi = regs->tf_rdi;
frame.sf_sc.uc_mcontext.sc_esi = regs->tf_rsi;
frame.sf_sc.uc_mcontext.sc_ebp = regs->tf_rbp;
frame.sf_sc.uc_mcontext.sc_ebx = regs->tf_rbx;
frame.sf_sc.uc_mcontext.sc_edx = regs->tf_rdx;
frame.sf_sc.uc_mcontext.sc_ecx = regs->tf_rcx;
frame.sf_sc.uc_mcontext.sc_eax = regs->tf_rax;
frame.sf_sc.uc_mcontext.sc_eip = regs->tf_rip;
frame.sf_sc.uc_mcontext.sc_cs = regs->tf_cs;
frame.sf_sc.uc_mcontext.sc_gs = regs->tf_gs;
frame.sf_sc.uc_mcontext.sc_fs = regs->tf_fs;
frame.sf_sc.uc_mcontext.sc_es = regs->tf_es;
frame.sf_sc.uc_mcontext.sc_ds = regs->tf_ds;
frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_rflags;
frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_rsp;
frame.sf_sc.uc_mcontext.sc_ss = regs->tf_ss;
frame.sf_sc.uc_mcontext.sc_err = regs->tf_err;
frame.sf_sc.uc_mcontext.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr;
frame.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code);
#ifdef DEBUG
if (ldebug(rt_sendsig))
printf(LMSG("rt_sendsig flags: 0x%x, sp: %p, ss: 0x%lx, mask: 0x%x"),
frame.sf_sc.uc_stack.ss_flags, td->td_sigstk.ss_sp,
td->td_sigstk.ss_size, frame.sf_sc.uc_mcontext.sc_mask);
#endif
if (copyout(&frame, fp, sizeof(frame)) != 0) {
/*
* Process has trashed its stack; give it an illegal
* instruction to halt it in its tracks.
*/
#ifdef DEBUG
if (ldebug(rt_sendsig))
printf(LMSG("rt_sendsig: bad stack %p, oonstack=%x"),
fp, oonstack);
#endif
PROC_LOCK(p);
sigexit(td, SIGILL);
}
/*
* Build context to run handler in.
*/
regs->tf_rsp = PTROUT(fp);
regs->tf_rip = p->p_sysent->sv_sigcode_base + linux_sznonrtsigcode;
regs->tf_rflags &= ~(PSL_T | PSL_D);
regs->tf_cs = _ucode32sel;
regs->tf_ss = _udatasel;
regs->tf_ds = _udatasel;
regs->tf_es = _udatasel;
regs->tf_fs = _ufssel;
regs->tf_gs = _ugssel;
regs->tf_flags = TF_HASSEGS;
set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
PROC_LOCK(p);
mtx_lock(&psp->ps_mtx);
}
void
ia32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
{
struct ia32_sigframe sf, *sfp;
struct siginfo32 siginfo;
struct proc *p;
struct thread *td;
struct sigacts *psp;
char *sp;
struct trapframe *regs;
char *xfpusave;
size_t xfpusave_len;
int oonstack;
int sig;
siginfo_to_siginfo32(&ksi->ksi_info, &siginfo);
td = curthread;
p = td->td_proc;
PROC_LOCK_ASSERT(p, MA_OWNED);
sig = siginfo.si_signo;
psp = p->p_sigacts;
#ifdef COMPAT_FREEBSD4
if (SIGISMEMBER(psp->ps_freebsd4, sig)) {
freebsd4_ia32_sendsig(catcher, ksi, mask);
return;
}
#endif
#ifdef COMPAT_43
if (SIGISMEMBER(psp->ps_osigset, sig)) {
ia32_osendsig(catcher, ksi, mask);
return;
}
#endif
mtx_assert(&psp->ps_mtx, MA_OWNED);
regs = td->td_frame;
oonstack = sigonstack(regs->tf_rsp);
if (cpu_max_ext_state_size > sizeof(struct savefpu) && use_xsave) {
xfpusave_len = cpu_max_ext_state_size - sizeof(struct savefpu);
xfpusave = __builtin_alloca(xfpusave_len);
} else {
xfpusave_len = 0;
xfpusave = NULL;
}
/* Save user context. */
bzero(&sf, sizeof(sf));
sf.sf_uc.uc_sigmask = *mask;
sf.sf_uc.uc_stack.ss_sp = (uintptr_t)td->td_sigstk.ss_sp;
sf.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size;
sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
sf.sf_uc.uc_mcontext.mc_edi = regs->tf_rdi;
sf.sf_uc.uc_mcontext.mc_esi = regs->tf_rsi;
sf.sf_uc.uc_mcontext.mc_ebp = regs->tf_rbp;
sf.sf_uc.uc_mcontext.mc_isp = regs->tf_rsp; /* XXX */
sf.sf_uc.uc_mcontext.mc_ebx = regs->tf_rbx;
sf.sf_uc.uc_mcontext.mc_edx = regs->tf_rdx;
sf.sf_uc.uc_mcontext.mc_ecx = regs->tf_rcx;
sf.sf_uc.uc_mcontext.mc_eax = regs->tf_rax;
sf.sf_uc.uc_mcontext.mc_trapno = regs->tf_trapno;
sf.sf_uc.uc_mcontext.mc_err = regs->tf_err;
sf.sf_uc.uc_mcontext.mc_eip = regs->tf_rip;
sf.sf_uc.uc_mcontext.mc_cs = regs->tf_cs;
sf.sf_uc.uc_mcontext.mc_eflags = regs->tf_rflags;
sf.sf_uc.uc_mcontext.mc_esp = regs->tf_rsp;
sf.sf_uc.uc_mcontext.mc_ss = regs->tf_ss;
sf.sf_uc.uc_mcontext.mc_ds = regs->tf_ds;
sf.sf_uc.uc_mcontext.mc_es = regs->tf_es;
sf.sf_uc.uc_mcontext.mc_fs = regs->tf_fs;
sf.sf_uc.uc_mcontext.mc_gs = regs->tf_gs;
sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext); /* magic */
ia32_get_fpcontext(td, &sf.sf_uc.uc_mcontext, xfpusave, xfpusave_len);
fpstate_drop(td);
sf.sf_uc.uc_mcontext.mc_fsbase = td->td_pcb->pcb_fsbase;
sf.sf_uc.uc_mcontext.mc_gsbase = td->td_pcb->pcb_gsbase;
bzero(sf.sf_uc.__spare__, sizeof(sf.sf_uc.__spare__));
/* Allocate space for the signal handler context. */
if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
SIGISMEMBER(psp->ps_sigonstack, sig))
sp = td->td_sigstk.ss_sp + td->td_sigstk.ss_size;
else
sp = (char *)regs->tf_rsp;
if (xfpusave != NULL) {
sp -= xfpusave_len;
sp = (char *)((unsigned long)sp & ~0x3Ful);
sf.sf_uc.uc_mcontext.mc_xfpustate = (register_t)sp;
}
sp -= sizeof(sf);
/* Align to 16 bytes. */
sfp = (struct ia32_sigframe *)((uintptr_t)sp & ~0xF);
PROC_UNLOCK(p);
/* Translate the signal if appropriate. */
if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize)
sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
/* Build the argument list for the signal handler. */
sf.sf_signum = sig;
sf.sf_ucontext = (register_t)&sfp->sf_uc;
bzero(&sf.sf_si, sizeof(sf.sf_si));
if (SIGISMEMBER(psp->ps_siginfo, sig)) {
/* Signal handler installed with SA_SIGINFO. */
sf.sf_siginfo = (u_int32_t)(uintptr_t)&sfp->sf_si;
sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
/* Fill in POSIX parts */
sf.sf_si = siginfo;
sf.sf_si.si_signo = sig;
} else {
/* Old FreeBSD-style arguments. */
sf.sf_siginfo = siginfo.si_code;
sf.sf_addr = (u_int32_t)siginfo.si_addr;
sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
}
mtx_unlock(&psp->ps_mtx);
/*
* Copy the sigframe out to the user's stack.
*/
if (copyout(&sf, sfp, sizeof(*sfp)) != 0 ||
(xfpusave != NULL && copyout(xfpusave,
PTRIN(sf.sf_uc.uc_mcontext.mc_xfpustate), xfpusave_len)
!= 0)) {
#ifdef DEBUG
printf("process %ld has trashed its stack\n", (long)p->p_pid);
#endif
PROC_LOCK(p);
sigexit(td, SIGILL);
}
regs->tf_rsp = (uintptr_t)sfp;
regs->tf_rip = p->p_sysent->sv_sigcode_base;
regs->tf_rflags &= ~(PSL_T | PSL_D);
regs->tf_cs = _ucode32sel;
regs->tf_ss = _udatasel;
regs->tf_ds = _udatasel;
regs->tf_es = _udatasel;
set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
/* XXXKIB leave user %fs and %gs untouched */
PROC_LOCK(p);
mtx_lock(&psp->ps_mtx);
}
static void
freebsd4_ia32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
{
struct ia32_sigframe4 sf, *sfp;
struct siginfo32 siginfo;
struct proc *p;
struct thread *td;
struct sigacts *psp;
struct trapframe *regs;
int oonstack;
int sig;
td = curthread;
p = td->td_proc;
siginfo_to_siginfo32(&ksi->ksi_info, &siginfo);
PROC_LOCK_ASSERT(p, MA_OWNED);
sig = siginfo.si_signo;
psp = p->p_sigacts;
mtx_assert(&psp->ps_mtx, MA_OWNED);
regs = td->td_frame;
oonstack = sigonstack(regs->tf_rsp);
/* Save user context. */
bzero(&sf, sizeof(sf));
sf.sf_uc.uc_sigmask = *mask;
sf.sf_uc.uc_stack.ss_sp = (uintptr_t)td->td_sigstk.ss_sp;
sf.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size;
sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
sf.sf_uc.uc_mcontext.mc_edi = regs->tf_rdi;
sf.sf_uc.uc_mcontext.mc_esi = regs->tf_rsi;
sf.sf_uc.uc_mcontext.mc_ebp = regs->tf_rbp;
sf.sf_uc.uc_mcontext.mc_isp = regs->tf_rsp; /* XXX */
sf.sf_uc.uc_mcontext.mc_ebx = regs->tf_rbx;
sf.sf_uc.uc_mcontext.mc_edx = regs->tf_rdx;
sf.sf_uc.uc_mcontext.mc_ecx = regs->tf_rcx;
sf.sf_uc.uc_mcontext.mc_eax = regs->tf_rax;
sf.sf_uc.uc_mcontext.mc_trapno = regs->tf_trapno;
sf.sf_uc.uc_mcontext.mc_err = regs->tf_err;
sf.sf_uc.uc_mcontext.mc_eip = regs->tf_rip;
sf.sf_uc.uc_mcontext.mc_cs = regs->tf_cs;
sf.sf_uc.uc_mcontext.mc_eflags = regs->tf_rflags;
sf.sf_uc.uc_mcontext.mc_esp = regs->tf_rsp;
sf.sf_uc.uc_mcontext.mc_ss = regs->tf_ss;
sf.sf_uc.uc_mcontext.mc_ds = regs->tf_ds;
sf.sf_uc.uc_mcontext.mc_es = regs->tf_es;
sf.sf_uc.uc_mcontext.mc_fs = regs->tf_fs;
sf.sf_uc.uc_mcontext.mc_gs = regs->tf_gs;
bzero(sf.sf_uc.uc_mcontext.mc_fpregs,
sizeof(sf.sf_uc.uc_mcontext.mc_fpregs));
bzero(sf.sf_uc.uc_mcontext.__spare__,
sizeof(sf.sf_uc.uc_mcontext.__spare__));
bzero(sf.sf_uc.__spare__, sizeof(sf.sf_uc.__spare__));
/* Allocate space for the signal handler context. */
if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
SIGISMEMBER(psp->ps_sigonstack, sig)) {
sfp = (struct ia32_sigframe4 *)(td->td_sigstk.ss_sp +
td->td_sigstk.ss_size - sizeof(sf));
} else
sfp = (struct ia32_sigframe4 *)regs->tf_rsp - 1;
PROC_UNLOCK(p);
/* Translate the signal if appropriate. */
if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize)
sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
/* Build the argument list for the signal handler. */
sf.sf_signum = sig;
sf.sf_ucontext = (register_t)&sfp->sf_uc;
bzero(&sf.sf_si, sizeof(sf.sf_si));
if (SIGISMEMBER(psp->ps_siginfo, sig)) {
/* Signal handler installed with SA_SIGINFO. */
sf.sf_siginfo = (u_int32_t)(uintptr_t)&sfp->sf_si;
sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
/* Fill in POSIX parts */
sf.sf_si = siginfo;
sf.sf_si.si_signo = sig;
} else {
/* Old FreeBSD-style arguments. */
sf.sf_siginfo = siginfo.si_code;
sf.sf_addr = (u_int32_t)siginfo.si_addr;
sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
}
mtx_unlock(&psp->ps_mtx);
/*
* Copy the sigframe out to the user's stack.
*/
if (copyout(&sf, sfp, sizeof(*sfp)) != 0) {
#ifdef DEBUG
printf("process %ld has trashed its stack\n", (long)p->p_pid);
#endif
PROC_LOCK(p);
sigexit(td, SIGILL);
}
regs->tf_rsp = (uintptr_t)sfp;
regs->tf_rip = p->p_sysent->sv_sigcode_base + sz_ia32_sigcode -
sz_freebsd4_ia32_sigcode;
regs->tf_rflags &= ~(PSL_T | PSL_D);
regs->tf_cs = _ucode32sel;
regs->tf_ss = _udatasel;
regs->tf_ds = _udatasel;
regs->tf_es = _udatasel;
set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
/* leave user %fs and %gs untouched */
PROC_LOCK(p);
mtx_lock(&psp->ps_mtx);
}
static void
ia32_osendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
{
struct ia32_sigframe3 sf, *fp;
struct proc *p;
struct thread *td;
struct sigacts *psp;
struct trapframe *regs;
int sig;
int oonstack;
td = curthread;
p = td->td_proc;
PROC_LOCK_ASSERT(p, MA_OWNED);
sig = ksi->ksi_signo;
psp = p->p_sigacts;
mtx_assert(&psp->ps_mtx, MA_OWNED);
regs = td->td_frame;
oonstack = sigonstack(regs->tf_rsp);
/* Allocate space for the signal handler context. */
if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
SIGISMEMBER(psp->ps_sigonstack, sig)) {
fp = (struct ia32_sigframe3 *)(td->td_sigstk.ss_sp +
td->td_sigstk.ss_size - sizeof(sf));
td->td_sigstk.ss_flags |= SS_ONSTACK;
} else
fp = (struct ia32_sigframe3 *)regs->tf_rsp - 1;
/* Translate the signal if appropriate. */
if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize)
sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
/* Build the argument list for the signal handler. */
sf.sf_signum = sig;
sf.sf_scp = (register_t)&fp->sf_siginfo.si_sc;
if (SIGISMEMBER(psp->ps_siginfo, sig)) {
/* Signal handler installed with SA_SIGINFO. */
sf.sf_arg2 = (register_t)&fp->sf_siginfo;
sf.sf_siginfo.si_signo = sig;
sf.sf_siginfo.si_code = ksi->ksi_code;
sf.sf_ah = (uintptr_t)catcher;
} else {
/* Old FreeBSD-style arguments. */
sf.sf_arg2 = ksi->ksi_code;
sf.sf_addr = (register_t)ksi->ksi_addr;
sf.sf_ah = (uintptr_t)catcher;
}
mtx_unlock(&psp->ps_mtx);
PROC_UNLOCK(p);
/* Save most if not all of trap frame. */
sf.sf_siginfo.si_sc.sc_eax = regs->tf_rax;
sf.sf_siginfo.si_sc.sc_ebx = regs->tf_rbx;
sf.sf_siginfo.si_sc.sc_ecx = regs->tf_rcx;
sf.sf_siginfo.si_sc.sc_edx = regs->tf_rdx;
sf.sf_siginfo.si_sc.sc_esi = regs->tf_rsi;
sf.sf_siginfo.si_sc.sc_edi = regs->tf_rdi;
sf.sf_siginfo.si_sc.sc_cs = regs->tf_cs;
sf.sf_siginfo.si_sc.sc_ds = regs->tf_ds;
sf.sf_siginfo.si_sc.sc_ss = regs->tf_ss;
sf.sf_siginfo.si_sc.sc_es = regs->tf_es;
sf.sf_siginfo.si_sc.sc_fs = regs->tf_fs;
sf.sf_siginfo.si_sc.sc_gs = regs->tf_gs;
sf.sf_siginfo.si_sc.sc_isp = regs->tf_rsp;
/* Build the signal context to be used by osigreturn(). */
sf.sf_siginfo.si_sc.sc_onstack = (oonstack) ? 1 : 0;
SIG2OSIG(*mask, sf.sf_siginfo.si_sc.sc_mask);
sf.sf_siginfo.si_sc.sc_esp = regs->tf_rsp;
sf.sf_siginfo.si_sc.sc_ebp = regs->tf_rbp;
sf.sf_siginfo.si_sc.sc_eip = regs->tf_rip;
sf.sf_siginfo.si_sc.sc_eflags = regs->tf_rflags;
sf.sf_siginfo.si_sc.sc_trapno = regs->tf_trapno;
sf.sf_siginfo.si_sc.sc_err = regs->tf_err;
/*
* Copy the sigframe out to the user's stack.
*/
if (copyout(&sf, fp, sizeof(*fp)) != 0) {
#ifdef DEBUG
printf("process %ld has trashed its stack\n", (long)p->p_pid);
#endif
PROC_LOCK(p);
sigexit(td, SIGILL);
}
regs->tf_rsp = (uintptr_t)fp;
regs->tf_rip = p->p_sysent->sv_psstrings - sz_ia32_osigcode;
regs->tf_rflags &= ~(PSL_T | PSL_D);
regs->tf_cs = _ucode32sel;
regs->tf_ds = _udatasel;
regs->tf_es = _udatasel;
regs->tf_fs = _udatasel;
regs->tf_ss = _udatasel;
set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
PROC_LOCK(p);
mtx_lock(&psp->ps_mtx);
}
