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/*-
* Copyright (c) 2012 Juli Mallett <jmallett@FreeBSD.org>
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
*
* $FreeBSD$
*/
/*
* Based on nwhitehorn's COMPAT_FREEBSD32 support code for PowerPC64.
*/
#include "opt_compat.h"
#define __ELF_WORD_SIZE 32
#include <sys/types.h>
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/sysent.h>
#include <sys/exec.h>
#include <sys/imgact.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <sys/namei.h>
#include <sys/fcntl.h>
#include <sys/sysent.h>
#include <sys/imgact_elf.h>
#include <sys/syscall.h>
#include <sys/syscallsubr.h>
#include <sys/sysproto.h>
#include <sys/signalvar.h>
#include <sys/vnode.h>
#include <sys/linker.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <machine/md_var.h>
#include <machine/reg.h>
#include <machine/sigframe.h>
#include <machine/sysarch.h>
#include <compat/freebsd32/freebsd32_signal.h>
#include <compat/freebsd32/freebsd32_util.h>
#include <compat/freebsd32/freebsd32_proto.h>
static void freebsd32_exec_setregs(struct thread *, struct image_params *, u_long);
static int get_mcontext32(struct thread *, mcontext32_t *, int);
static int set_mcontext32(struct thread *, mcontext32_t *);
static void freebsd32_sendsig(sig_t, ksiginfo_t *, sigset_t *);
extern const char *freebsd32_syscallnames[];
struct sysentvec elf32_freebsd_sysvec = {
.sv_size = SYS_MAXSYSCALL,
.sv_table = freebsd32_sysent,
.sv_mask = 0,
.sv_sigsize = 0,
.sv_sigtbl = NULL,
.sv_errsize = 0,
.sv_errtbl = NULL,
.sv_transtrap = NULL,
.sv_fixup = __elfN(freebsd_fixup),
.sv_sendsig = freebsd32_sendsig,
.sv_sigcode = sigcode32,
.sv_szsigcode = &szsigcode32,
.sv_prepsyscall = NULL,
.sv_name = "FreeBSD ELF32",
.sv_coredump = __elfN(coredump),
.sv_imgact_try = NULL,
.sv_minsigstksz = MINSIGSTKSZ,
.sv_pagesize = PAGE_SIZE,
.sv_minuser = VM_MIN_ADDRESS,
.sv_maxuser = ((vm_offset_t)0x80000000),
.sv_usrstack = FREEBSD32_USRSTACK,
.sv_psstrings = FREEBSD32_PS_STRINGS,
.sv_stackprot = VM_PROT_ALL,
.sv_copyout_strings = freebsd32_copyout_strings,
.sv_setregs = freebsd32_exec_setregs,
.sv_fixlimit = NULL,
.sv_maxssiz = NULL,
.sv_flags = SV_ABI_FREEBSD | SV_ILP32,
.sv_set_syscall_retval = cpu_set_syscall_retval,
.sv_fetch_syscall_args = cpu_fetch_syscall_args,
.sv_syscallnames = freebsd32_syscallnames,
.sv_schedtail = NULL,
};
INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec);
static Elf32_Brandinfo freebsd_brand_info = {
.brand = ELFOSABI_FREEBSD,
.machine = EM_MIPS,
.compat_3_brand = "FreeBSD",
.emul_path = NULL,
.interp_path = "/libexec/ld-elf.so.1",
.sysvec = &elf32_freebsd_sysvec,
.interp_newpath = "/libexec/ld-elf32.so.1",
.flags = 0
};
SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
(sysinit_cfunc_t) elf32_insert_brand_entry,
&freebsd_brand_info);
static void
freebsd32_exec_setregs(struct thread *td, struct image_params *imgp, u_long stack)
{
exec_setregs(td, imgp, stack);
/*
* See comment in exec_setregs about running 32-bit binaries with 64-bit
* registers.
*/
td->td_frame->sp -= 65536;
/*
* Clear extended address space bit for userland.
*/
td->td_frame->sr &= ~MIPS_SR_UX;
}
int
set_regs32(struct thread *td, struct reg32 *regs)
{
struct reg r;
unsigned i;
for (i = 0; i < NUMSAVEREGS; i++)
r.r_regs[i] = regs->r_regs[i];
return (set_regs(td, &r));
}
int
fill_regs32(struct thread *td, struct reg32 *regs)
{
struct reg r;
unsigned i;
int error;
error = fill_regs(td, &r);
if (error != 0)
return (error);
for (i = 0; i < NUMSAVEREGS; i++)
regs->r_regs[i] = r.r_regs[i];
return (0);
}
int
set_fpregs32(struct thread *td, struct fpreg32 *fpregs)
{
struct fpreg fp;
unsigned i;
for (i = 0; i < NUMFPREGS; i++)
fp.r_regs[i] = fpregs->r_regs[i];
return (set_fpregs(td, &fp));
}
int
fill_fpregs32(struct thread *td, struct fpreg32 *fpregs)
{
struct fpreg fp;
unsigned i;
int error;
error = fill_fpregs(td, &fp);
if (error != 0)
return (error);
for (i = 0; i < NUMFPREGS; i++)
fpregs->r_regs[i] = fp.r_regs[i];
return (0);
}
static int
get_mcontext32(struct thread *td, mcontext32_t *mcp, int flags)
{
mcontext_t mcp64;
unsigned i;
int error;
error = get_mcontext(td, &mcp64, flags);
if (error != 0)
return (error);
mcp->mc_onstack = mcp64.mc_onstack;
mcp->mc_pc = mcp64.mc_pc;
for (i = 0; i < 32; i++)
mcp->mc_regs[i] = mcp64.mc_regs[i];
mcp->sr = mcp64.sr;
mcp->mullo = mcp64.mullo;
mcp->mulhi = mcp64.mulhi;
mcp->mc_fpused = mcp64.mc_fpused;
for (i = 0; i < 33; i++)
mcp->mc_fpregs[i] = mcp64.mc_fpregs[i];
mcp->mc_fpc_eir = mcp64.mc_fpc_eir;
mcp->mc_tls = (int32_t)(intptr_t)mcp64.mc_tls;
return (0);
}
static int
set_mcontext32(struct thread *td, mcontext32_t *mcp)
{
mcontext_t mcp64;
unsigned i;
mcp64.mc_onstack = mcp->mc_onstack;
mcp64.mc_pc = mcp->mc_pc;
for (i = 0; i < 32; i++)
mcp64.mc_regs[i] = mcp->mc_regs[i];
mcp64.sr = mcp->sr;
mcp64.mullo = mcp->mullo;
mcp64.mulhi = mcp->mulhi;
mcp64.mc_fpused = mcp->mc_fpused;
for (i = 0; i < 33; i++)
mcp64.mc_fpregs[i] = mcp->mc_fpregs[i];
mcp64.mc_fpc_eir = mcp->mc_fpc_eir;
mcp64.mc_tls = (void *)(intptr_t)mcp->mc_tls;
return (set_mcontext(td, &mcp64));
}
int
freebsd32_sigreturn(struct thread *td, struct freebsd32_sigreturn_args *uap)
{
ucontext32_t uc;
int error;
CTR2(KTR_SIG, "sigreturn: td=%p ucp=%p", td, uap->sigcntxp);
if (copyin(uap->sigcntxp, &uc, sizeof(uc)) != 0) {
CTR1(KTR_SIG, "sigreturn: efault td=%p", td);
return (EFAULT);
}
error = set_mcontext32(td, &uc.uc_mcontext);
if (error != 0)
return (error);
kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask, NULL, 0);
#if 0
CTR3(KTR_SIG, "sigreturn: return td=%p pc=%#x sp=%#x",
td, uc.uc_mcontext.mc_srr0, uc.uc_mcontext.mc_gpr[1]);
#endif
return (EJUSTRETURN);
}
/*
* The first two fields of a ucontext_t are the signal mask and the machine
* context. The next field is uc_link; we want to avoid destroying the link
* when copying out contexts.
*/
#define UC32_COPY_SIZE offsetof(ucontext32_t, uc_link)
int
freebsd32_getcontext(struct thread *td, struct freebsd32_getcontext_args *uap)
{
ucontext32_t uc;
int ret;
if (uap->ucp == NULL)
ret = EINVAL;
else {
get_mcontext32(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
PROC_LOCK(td->td_proc);
uc.uc_sigmask = td->td_sigmask;
PROC_UNLOCK(td->td_proc);
ret = copyout(&uc, uap->ucp, UC32_COPY_SIZE);
}
return (ret);
}
int
freebsd32_setcontext(struct thread *td, struct freebsd32_setcontext_args *uap)
{
ucontext32_t uc;
int ret;
if (uap->ucp == NULL)
ret = EINVAL;
else {
ret = copyin(uap->ucp, &uc, UC32_COPY_SIZE);
if (ret == 0) {
ret = set_mcontext32(td, &uc.uc_mcontext);
if (ret == 0) {
kern_sigprocmask(td, SIG_SETMASK,
&uc.uc_sigmask, NULL, 0);
}
}
}
return (ret == 0 ? EJUSTRETURN : ret);
}
int
freebsd32_swapcontext(struct thread *td, struct freebsd32_swapcontext_args *uap)
{
ucontext32_t uc;
int ret;
if (uap->oucp == NULL || uap->ucp == NULL)
ret = EINVAL;
else {
get_mcontext32(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
PROC_LOCK(td->td_proc);
uc.uc_sigmask = td->td_sigmask;
PROC_UNLOCK(td->td_proc);
ret = copyout(&uc, uap->oucp, UC32_COPY_SIZE);
if (ret == 0) {
ret = copyin(uap->ucp, &uc, UC32_COPY_SIZE);
if (ret == 0) {
ret = set_mcontext32(td, &uc.uc_mcontext);
if (ret == 0) {
kern_sigprocmask(td, SIG_SETMASK,
&uc.uc_sigmask, NULL, 0);
}
}
}
}
return (ret == 0 ? EJUSTRETURN : ret);
}
#define UCONTEXT_MAGIC 0xACEDBADE
/*
* Send an interrupt to process.
*
* Stack is set up to allow sigcode stored
* at top 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
freebsd32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
{
struct proc *p;
struct thread *td;
struct fpreg32 fpregs;
struct reg32 regs;
struct sigacts *psp;
struct sigframe32 sf, *sfp;
int sig;
int oonstack;
unsigned i;
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);
fill_regs32(td, ®s);
oonstack = sigonstack(td->td_frame->sp);
/* save user context */
bzero(&sf, sizeof sf);
sf.sf_uc.uc_sigmask = *mask;
sf.sf_uc.uc_stack.ss_sp = (int32_t)(intptr_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_sigstk.ss_flags;
sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
sf.sf_uc.uc_mcontext.mc_pc = regs.r_regs[PC];
sf.sf_uc.uc_mcontext.mullo = regs.r_regs[MULLO];
sf.sf_uc.uc_mcontext.mulhi = regs.r_regs[MULHI];
sf.sf_uc.uc_mcontext.mc_tls = (int32_t)(intptr_t)td->td_md.md_tls;
sf.sf_uc.uc_mcontext.mc_regs[0] = UCONTEXT_MAGIC; /* magic number */
for (i = 1; i < 32; i++)
sf.sf_uc.uc_mcontext.mc_regs[i] = regs.r_regs[i];
sf.sf_uc.uc_mcontext.mc_fpused = td->td_md.md_flags & MDTD_FPUSED;
if (sf.sf_uc.uc_mcontext.mc_fpused) {
/* if FPU has current state, save it first */
if (td == PCPU_GET(fpcurthread))
MipsSaveCurFPState(td);
fill_fpregs32(td, &fpregs);
for (i = 0; i < 33; i++)
sf.sf_uc.uc_mcontext.mc_fpregs[i] = fpregs.r_regs[i];
}
/* Allocate and validate space for the signal handler context. */
if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
SIGISMEMBER(psp->ps_sigonstack, sig)) {
sfp = (struct sigframe32 *)((vm_offset_t)(td->td_sigstk.ss_sp +
td->td_sigstk.ss_size - sizeof(struct sigframe32))
& ~(sizeof(__int64_t) - 1));
} else
sfp = (struct sigframe32 *)((vm_offset_t)(td->td_frame->sp -
sizeof(struct sigframe32)) & ~(sizeof(__int64_t) - 1));
/* Translate the signal if appropriate */
if (p->p_sysent->sv_sigtbl) {
if (sig <= p->p_sysent->sv_sigsize)
sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
}
/* Build the argument list for the signal handler. */
td->td_frame->a0 = sig;
td->td_frame->a2 = (register_t)(intptr_t)&sfp->sf_uc;
if (SIGISMEMBER(psp->ps_siginfo, sig)) {
/* Signal handler installed with SA_SIGINFO. */
td->td_frame->a1 = (register_t)(intptr_t)&sfp->sf_si;
/* sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher; */
/* fill siginfo structure */
sf.sf_si.si_signo = sig;
sf.sf_si.si_code = ksi->ksi_code;
sf.sf_si.si_addr = td->td_frame->badvaddr;
} else {
/* Old FreeBSD-style arguments. */
td->td_frame->a1 = ksi->ksi_code;
td->td_frame->a3 = td->td_frame->badvaddr;
/* sf.sf_ahu.sf_handler = catcher; */
}
mtx_unlock(&psp->ps_mtx);
PROC_UNLOCK(p);
/*
* Copy the sigframe out to the user's stack.
*/
if (copyout(&sf, sfp, sizeof(struct sigframe32)) != 0) {
/*
* Something is wrong with the stack pointer.
* ...Kill the process.
*/
PROC_LOCK(p);
sigexit(td, SIGILL);
}
td->td_frame->pc = (register_t)(intptr_t)catcher;
td->td_frame->t9 = (register_t)(intptr_t)catcher;
td->td_frame->sp = (register_t)(intptr_t)sfp;
/*
* Signal trampoline code is at base of user stack.
*/
td->td_frame->ra = (register_t)(intptr_t)FREEBSD32_PS_STRINGS - *(p->p_sysent->sv_szsigcode);
PROC_LOCK(p);
mtx_lock(&psp->ps_mtx);
}
int
freebsd32_sysarch(struct thread *td, struct freebsd32_sysarch_args *uap)
{
int error;
int32_t tlsbase;
switch (uap->op) {
case MIPS_SET_TLS:
td->td_md.md_tls = (void *)(intptr_t)uap->parms;
return (0);
case MIPS_GET_TLS:
tlsbase = (int32_t)(intptr_t)td->td_md.md_tls;
error = copyout(&tlsbase, uap->parms, sizeof(tlsbase));
return (error);
default:
break;
}
return (EINVAL);
}
void
elf32_dump_thread(struct thread *td __unused, void *dst __unused,
size_t *off __unused)
{
}
|