linux-user: move arm signal.c parts to arm directory

No code change, only move code from signal.c to
arm/signal.c, except adding includes and
exporting setup_frame() and setup_rt_frame().

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20180424192635.6027-4-laurent@vivier.eu>

2 files changed, 759 insertions, 1 deletions

diff --git a/linux-user/arm/signal.c b/linux-user/arm/signal.c
index 02ca338b6c..0c1ec53025 100644
--- a/linux-user/arm/signal.c
+++ b/linux-user/arm/signal.c
@@ -16,3 +16,757 @@
  *  You should have received a copy of the GNU General Public License
  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
+#include "qemu/osdep.h"
+#include "qemu.h"
+#include "target_signal.h"
+#include "signal-common.h"
+#include "linux-user/trace.h"
+
+struct target_sigcontext {
+    abi_ulong trap_no;
+    abi_ulong error_code;
+    abi_ulong oldmask;
+    abi_ulong arm_r0;
+    abi_ulong arm_r1;
+    abi_ulong arm_r2;
+    abi_ulong arm_r3;
+    abi_ulong arm_r4;
+    abi_ulong arm_r5;
+    abi_ulong arm_r6;
+    abi_ulong arm_r7;
+    abi_ulong arm_r8;
+    abi_ulong arm_r9;
+    abi_ulong arm_r10;
+    abi_ulong arm_fp;
+    abi_ulong arm_ip;
+    abi_ulong arm_sp;
+    abi_ulong arm_lr;
+    abi_ulong arm_pc;
+    abi_ulong arm_cpsr;
+    abi_ulong fault_address;
+};
+
+struct target_ucontext_v1 {
+    abi_ulong tuc_flags;
+    abi_ulong tuc_link;
+    target_stack_t tuc_stack;
+    struct target_sigcontext tuc_mcontext;
+    target_sigset_t  tuc_sigmask;       /* mask last for extensibility */
+};
+
+struct target_ucontext_v2 {
+    abi_ulong tuc_flags;
+    abi_ulong tuc_link;
+    target_stack_t tuc_stack;
+    struct target_sigcontext tuc_mcontext;
+    target_sigset_t  tuc_sigmask;       /* mask last for extensibility */
+    char __unused[128 - sizeof(target_sigset_t)];
+    abi_ulong tuc_regspace[128] __attribute__((__aligned__(8)));
+};
+
+struct target_user_vfp {
+    uint64_t fpregs[32];
+    abi_ulong fpscr;
+};
+
+struct target_user_vfp_exc {
+    abi_ulong fpexc;
+    abi_ulong fpinst;
+    abi_ulong fpinst2;
+};
+
+struct target_vfp_sigframe {
+    abi_ulong magic;
+    abi_ulong size;
+    struct target_user_vfp ufp;
+    struct target_user_vfp_exc ufp_exc;
+} __attribute__((__aligned__(8)));
+
+struct target_iwmmxt_sigframe {
+    abi_ulong magic;
+    abi_ulong size;
+    uint64_t regs[16];
+    /* Note that not all the coprocessor control registers are stored here */
+    uint32_t wcssf;
+    uint32_t wcasf;
+    uint32_t wcgr0;
+    uint32_t wcgr1;
+    uint32_t wcgr2;
+    uint32_t wcgr3;
+} __attribute__((__aligned__(8)));
+
+#define TARGET_VFP_MAGIC 0x56465001
+#define TARGET_IWMMXT_MAGIC 0x12ef842a
+
+struct sigframe_v1
+{
+    struct target_sigcontext sc;
+    abi_ulong extramask[TARGET_NSIG_WORDS-1];
+    abi_ulong retcode;
+};
+
+struct sigframe_v2
+{
+    struct target_ucontext_v2 uc;
+    abi_ulong retcode;
+};
+
+struct rt_sigframe_v1
+{
+    abi_ulong pinfo;
+    abi_ulong puc;
+    struct target_siginfo info;
+    struct target_ucontext_v1 uc;
+    abi_ulong retcode;
+};
+
+struct rt_sigframe_v2
+{
+    struct target_siginfo info;
+    struct target_ucontext_v2 uc;
+    abi_ulong retcode;
+};
+
+#define TARGET_CONFIG_CPU_32 1
+
+/*
+ * For ARM syscalls, we encode the syscall number into the instruction.
+ */
+#define SWI_SYS_SIGRETURN       (0xef000000|(TARGET_NR_sigreturn + ARM_SYSCALL_BASE))
+#define SWI_SYS_RT_SIGRETURN    (0xef000000|(TARGET_NR_rt_sigreturn + ARM_SYSCALL_BASE))
+
+/*
+ * For Thumb syscalls, we pass the syscall number via r7.  We therefore
+ * need two 16-bit instructions.
+ */
+#define SWI_THUMB_SIGRETURN     (0xdf00 << 16 | 0x2700 | (TARGET_NR_sigreturn))
+#define SWI_THUMB_RT_SIGRETURN  (0xdf00 << 16 | 0x2700 | (TARGET_NR_rt_sigreturn))
+
+static const abi_ulong retcodes[4] = {
+        SWI_SYS_SIGRETURN,      SWI_THUMB_SIGRETURN,
+        SWI_SYS_RT_SIGRETURN,   SWI_THUMB_RT_SIGRETURN
+};
+
+
+static inline int valid_user_regs(CPUARMState *regs)
+{
+    return 1;
+}
+
+static void
+setup_sigcontext(struct target_sigcontext *sc, /*struct _fpstate *fpstate,*/
+                 CPUARMState *env, abi_ulong mask)
+{
+    __put_user(env->regs[0], &sc->arm_r0);
+    __put_user(env->regs[1], &sc->arm_r1);
+    __put_user(env->regs[2], &sc->arm_r2);
+    __put_user(env->regs[3], &sc->arm_r3);
+    __put_user(env->regs[4], &sc->arm_r4);
+    __put_user(env->regs[5], &sc->arm_r5);
+    __put_user(env->regs[6], &sc->arm_r6);
+    __put_user(env->regs[7], &sc->arm_r7);
+    __put_user(env->regs[8], &sc->arm_r8);
+    __put_user(env->regs[9], &sc->arm_r9);
+    __put_user(env->regs[10], &sc->arm_r10);
+    __put_user(env->regs[11], &sc->arm_fp);
+    __put_user(env->regs[12], &sc->arm_ip);
+    __put_user(env->regs[13], &sc->arm_sp);
+    __put_user(env->regs[14], &sc->arm_lr);
+    __put_user(env->regs[15], &sc->arm_pc);
+#ifdef TARGET_CONFIG_CPU_32
+    __put_user(cpsr_read(env), &sc->arm_cpsr);
+#endif
+
+    __put_user(/* current->thread.trap_no */ 0, &sc->trap_no);
+    __put_user(/* current->thread.error_code */ 0, &sc->error_code);
+    __put_user(/* current->thread.address */ 0, &sc->fault_address);
+    __put_user(mask, &sc->oldmask);
+}
+
+static inline abi_ulong
+get_sigframe(struct target_sigaction *ka, CPUARMState *regs, int framesize)
+{
+    unsigned long sp = regs->regs[13];
+
+    /*
+     * This is the X/Open sanctioned signal stack switching.
+     */
+    if ((ka->sa_flags & TARGET_SA_ONSTACK) && !sas_ss_flags(sp)) {
+        sp = target_sigaltstack_used.ss_sp + target_sigaltstack_used.ss_size;
+    }
+    /*
+     * ATPCS B01 mandates 8-byte alignment
+     */
+    return (sp - framesize) & ~7;
+}
+
+static void
+setup_return(CPUARMState *env, struct target_sigaction *ka,
+             abi_ulong *rc, abi_ulong frame_addr, int usig, abi_ulong rc_addr)
+{
+    abi_ulong handler = ka->_sa_handler;
+    abi_ulong retcode;
+    int thumb = handler & 1;
+    uint32_t cpsr = cpsr_read(env);
+
+    cpsr &= ~CPSR_IT;
+    if (thumb) {
+        cpsr |= CPSR_T;
+    } else {
+        cpsr &= ~CPSR_T;
+    }
+
+    if (ka->sa_flags & TARGET_SA_RESTORER) {
+        retcode = ka->sa_restorer;
+    } else {
+        unsigned int idx = thumb;
+
+        if (ka->sa_flags & TARGET_SA_SIGINFO) {
+            idx += 2;
+        }
+
+        __put_user(retcodes[idx], rc);
+
+        retcode = rc_addr + thumb;
+    }
+
+    env->regs[0] = usig;
+    env->regs[13] = frame_addr;
+    env->regs[14] = retcode;
+    env->regs[15] = handler & (thumb ? ~1 : ~3);
+    cpsr_write(env, cpsr, CPSR_IT | CPSR_T, CPSRWriteByInstr);
+}
+
+static abi_ulong *setup_sigframe_v2_vfp(abi_ulong *regspace, CPUARMState *env)
+{
+    int i;
+    struct target_vfp_sigframe *vfpframe;
+    vfpframe = (struct target_vfp_sigframe *)regspace;
+    __put_user(TARGET_VFP_MAGIC, &vfpframe->magic);
+    __put_user(sizeof(*vfpframe), &vfpframe->size);
+    for (i = 0; i < 32; i++) {
+        __put_user(*aa32_vfp_dreg(env, i), &vfpframe->ufp.fpregs[i]);
+    }
+    __put_user(vfp_get_fpscr(env), &vfpframe->ufp.fpscr);
+    __put_user(env->vfp.xregs[ARM_VFP_FPEXC], &vfpframe->ufp_exc.fpexc);
+    __put_user(env->vfp.xregs[ARM_VFP_FPINST], &vfpframe->ufp_exc.fpinst);
+    __put_user(env->vfp.xregs[ARM_VFP_FPINST2], &vfpframe->ufp_exc.fpinst2);
+    return (abi_ulong*)(vfpframe+1);
+}
+
+static abi_ulong *setup_sigframe_v2_iwmmxt(abi_ulong *regspace,
+                                           CPUARMState *env)
+{
+    int i;
+    struct target_iwmmxt_sigframe *iwmmxtframe;
+    iwmmxtframe = (struct target_iwmmxt_sigframe *)regspace;
+    __put_user(TARGET_IWMMXT_MAGIC, &iwmmxtframe->magic);
+    __put_user(sizeof(*iwmmxtframe), &iwmmxtframe->size);
+    for (i = 0; i < 16; i++) {
+        __put_user(env->iwmmxt.regs[i], &iwmmxtframe->regs[i]);
+    }
+    __put_user(env->vfp.xregs[ARM_IWMMXT_wCSSF], &iwmmxtframe->wcssf);
+    __put_user(env->vfp.xregs[ARM_IWMMXT_wCASF], &iwmmxtframe->wcssf);
+    __put_user(env->vfp.xregs[ARM_IWMMXT_wCGR0], &iwmmxtframe->wcgr0);
+    __put_user(env->vfp.xregs[ARM_IWMMXT_wCGR1], &iwmmxtframe->wcgr1);
+    __put_user(env->vfp.xregs[ARM_IWMMXT_wCGR2], &iwmmxtframe->wcgr2);
+    __put_user(env->vfp.xregs[ARM_IWMMXT_wCGR3], &iwmmxtframe->wcgr3);
+    return (abi_ulong*)(iwmmxtframe+1);
+}
+
+static void setup_sigframe_v2(struct target_ucontext_v2 *uc,
+                              target_sigset_t *set, CPUARMState *env)
+{
+    struct target_sigaltstack stack;
+    int i;
+    abi_ulong *regspace;
+
+    /* Clear all the bits of the ucontext we don't use.  */
+    memset(uc, 0, offsetof(struct target_ucontext_v2, tuc_mcontext));
+
+    memset(&stack, 0, sizeof(stack));
+    __put_user(target_sigaltstack_used.ss_sp, &stack.ss_sp);
+    __put_user(target_sigaltstack_used.ss_size, &stack.ss_size);
+    __put_user(sas_ss_flags(get_sp_from_cpustate(env)), &stack.ss_flags);
+    memcpy(&uc->tuc_stack, &stack, sizeof(stack));
+
+    setup_sigcontext(&uc->tuc_mcontext, env, set->sig[0]);
+    /* Save coprocessor signal frame.  */
+    regspace = uc->tuc_regspace;
+    if (arm_feature(env, ARM_FEATURE_VFP)) {
+        regspace = setup_sigframe_v2_vfp(regspace, env);
+    }
+    if (arm_feature(env, ARM_FEATURE_IWMMXT)) {
+        regspace = setup_sigframe_v2_iwmmxt(regspace, env);
+    }
+
+    /* Write terminating magic word */
+    __put_user(0, regspace);
+
+    for(i = 0; i < TARGET_NSIG_WORDS; i++) {
+        __put_user(set->sig[i], &uc->tuc_sigmask.sig[i]);
+    }
+}
+
+/* compare linux/arch/arm/kernel/signal.c:setup_frame() */
+static void setup_frame_v1(int usig, struct target_sigaction *ka,
+                           target_sigset_t *set, CPUARMState *regs)
+{
+    struct sigframe_v1 *frame;
+    abi_ulong frame_addr = get_sigframe(ka, regs, sizeof(*frame));
+    int i;
+
+    trace_user_setup_frame(regs, frame_addr);
+    if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
+        goto sigsegv;
+    }
+
+    setup_sigcontext(&frame->sc, regs, set->sig[0]);
+
+    for(i = 1; i < TARGET_NSIG_WORDS; i++) {
+        __put_user(set->sig[i], &frame->extramask[i - 1]);
+    }
+
+    setup_return(regs, ka, &frame->retcode, frame_addr, usig,
+                 frame_addr + offsetof(struct sigframe_v1, retcode));
+
+    unlock_user_struct(frame, frame_addr, 1);
+    return;
+sigsegv:
+    force_sigsegv(usig);
+}
+
+static void setup_frame_v2(int usig, struct target_sigaction *ka,
+                           target_sigset_t *set, CPUARMState *regs)
+{
+    struct sigframe_v2 *frame;
+    abi_ulong frame_addr = get_sigframe(ka, regs, sizeof(*frame));
+
+    trace_user_setup_frame(regs, frame_addr);
+    if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
+        goto sigsegv;
+    }
+
+    setup_sigframe_v2(&frame->uc, set, regs);
+
+    setup_return(regs, ka, &frame->retcode, frame_addr, usig,
+                 frame_addr + offsetof(struct sigframe_v2, retcode));
+
+    unlock_user_struct(frame, frame_addr, 1);
+    return;
+sigsegv:
+    force_sigsegv(usig);
+}
+
+void setup_frame(int usig, struct target_sigaction *ka,
+                 target_sigset_t *set, CPUARMState *regs)
+{
+    if (get_osversion() >= 0x020612) {
+        setup_frame_v2(usig, ka, set, regs);
+    } else {
+        setup_frame_v1(usig, ka, set, regs);
+    }
+}
+
+/* compare linux/arch/arm/kernel/signal.c:setup_rt_frame() */
+static void setup_rt_frame_v1(int usig, struct target_sigaction *ka,
+                              target_siginfo_t *info,
+                              target_sigset_t *set, CPUARMState *env)
+{
+    struct rt_sigframe_v1 *frame;
+    abi_ulong frame_addr = get_sigframe(ka, env, sizeof(*frame));
+    struct target_sigaltstack stack;
+    int i;
+    abi_ulong info_addr, uc_addr;
+
+    trace_user_setup_rt_frame(env, frame_addr);
+    if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
+        goto sigsegv;
+    }
+
+    info_addr = frame_addr + offsetof(struct rt_sigframe_v1, info);
+    __put_user(info_addr, &frame->pinfo);
+    uc_addr = frame_addr + offsetof(struct rt_sigframe_v1, uc);
+    __put_user(uc_addr, &frame->puc);
+    tswap_siginfo(&frame->info, info);
+
+    /* Clear all the bits of the ucontext we don't use.  */
+    memset(&frame->uc, 0, offsetof(struct target_ucontext_v1, tuc_mcontext));
+
+    memset(&stack, 0, sizeof(stack));
+    __put_user(target_sigaltstack_used.ss_sp, &stack.ss_sp);
+    __put_user(target_sigaltstack_used.ss_size, &stack.ss_size);
+    __put_user(sas_ss_flags(get_sp_from_cpustate(env)), &stack.ss_flags);
+    memcpy(&frame->uc.tuc_stack, &stack, sizeof(stack));
+
+    setup_sigcontext(&frame->uc.tuc_mcontext, env, set->sig[0]);
+    for(i = 0; i < TARGET_NSIG_WORDS; i++) {
+        __put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i]);
+    }
+
+    setup_return(env, ka, &frame->retcode, frame_addr, usig,
+                 frame_addr + offsetof(struct rt_sigframe_v1, retcode));
+
+    env->regs[1] = info_addr;
+    env->regs[2] = uc_addr;
+
+    unlock_user_struct(frame, frame_addr, 1);
+    return;
+sigsegv:
+    force_sigsegv(usig);
+}
+
+static void setup_rt_frame_v2(int usig, struct target_sigaction *ka,
+                              target_siginfo_t *info,
+                              target_sigset_t *set, CPUARMState *env)
+{
+    struct rt_sigframe_v2 *frame;
+    abi_ulong frame_addr = get_sigframe(ka, env, sizeof(*frame));
+    abi_ulong info_addr, uc_addr;
+
+    trace_user_setup_rt_frame(env, frame_addr);
+    if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
+        goto sigsegv;
+    }
+
+    info_addr = frame_addr + offsetof(struct rt_sigframe_v2, info);
+    uc_addr = frame_addr + offsetof(struct rt_sigframe_v2, uc);
+    tswap_siginfo(&frame->info, info);
+
+    setup_sigframe_v2(&frame->uc, set, env);
+
+    setup_return(env, ka, &frame->retcode, frame_addr, usig,
+                 frame_addr + offsetof(struct rt_sigframe_v2, retcode));
+
+    env->regs[1] = info_addr;
+    env->regs[2] = uc_addr;
+
+    unlock_user_struct(frame, frame_addr, 1);
+    return;
+sigsegv:
+    force_sigsegv(usig);
+}
+
+void setup_rt_frame(int usig, struct target_sigaction *ka,
+                    target_siginfo_t *info,
+                    target_sigset_t *set, CPUARMState *env)
+{
+    if (get_osversion() >= 0x020612) {
+        setup_rt_frame_v2(usig, ka, info, set, env);
+    } else {
+        setup_rt_frame_v1(usig, ka, info, set, env);
+    }
+}
+
+static int
+restore_sigcontext(CPUARMState *env, struct target_sigcontext *sc)
+{
+    int err = 0;
+    uint32_t cpsr;
+
+    __get_user(env->regs[0], &sc->arm_r0);
+    __get_user(env->regs[1], &sc->arm_r1);
+    __get_user(env->regs[2], &sc->arm_r2);
+    __get_user(env->regs[3], &sc->arm_r3);
+    __get_user(env->regs[4], &sc->arm_r4);
+    __get_user(env->regs[5], &sc->arm_r5);
+    __get_user(env->regs[6], &sc->arm_r6);
+    __get_user(env->regs[7], &sc->arm_r7);
+    __get_user(env->regs[8], &sc->arm_r8);
+    __get_user(env->regs[9], &sc->arm_r9);
+    __get_user(env->regs[10], &sc->arm_r10);
+    __get_user(env->regs[11], &sc->arm_fp);
+    __get_user(env->regs[12], &sc->arm_ip);
+    __get_user(env->regs[13], &sc->arm_sp);
+    __get_user(env->regs[14], &sc->arm_lr);
+    __get_user(env->regs[15], &sc->arm_pc);
+#ifdef TARGET_CONFIG_CPU_32
+    __get_user(cpsr, &sc->arm_cpsr);
+    cpsr_write(env, cpsr, CPSR_USER | CPSR_EXEC, CPSRWriteByInstr);
+#endif
+
+    err |= !valid_user_regs(env);
+
+    return err;
+}
+
+static long do_sigreturn_v1(CPUARMState *env)
+{
+    abi_ulong frame_addr;
+    struct sigframe_v1 *frame = NULL;
+    target_sigset_t set;
+    sigset_t host_set;
+    int i;
+
+    /*
+     * Since we stacked the signal on a 64-bit boundary,
+     * then 'sp' should be word aligned here.  If it's
+     * not, then the user is trying to mess with us.
+     */
+    frame_addr = env->regs[13];
+    trace_user_do_sigreturn(env, frame_addr);
+    if (frame_addr & 7) {
+        goto badframe;
+    }
+
+    if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
+        goto badframe;
+    }
+
+    __get_user(set.sig[0], &frame->sc.oldmask);
+    for(i = 1; i < TARGET_NSIG_WORDS; i++) {
+        __get_user(set.sig[i], &frame->extramask[i - 1]);
+    }
+
+    target_to_host_sigset_internal(&host_set, &set);
+    set_sigmask(&host_set);
+
+    if (restore_sigcontext(env, &frame->sc)) {
+        goto badframe;
+    }
+
+#if 0
+    /* Send SIGTRAP if we're single-stepping */
+    if (ptrace_cancel_bpt(current))
+        send_sig(SIGTRAP, current, 1);
+#endif
+    unlock_user_struct(frame, frame_addr, 0);
+    return -TARGET_QEMU_ESIGRETURN;
+
+badframe:
+    force_sig(TARGET_SIGSEGV);
+    return -TARGET_QEMU_ESIGRETURN;
+}
+
+static abi_ulong *restore_sigframe_v2_vfp(CPUARMState *env, abi_ulong *regspace)
+{
+    int i;
+    abi_ulong magic, sz;
+    uint32_t fpscr, fpexc;
+    struct target_vfp_sigframe *vfpframe;
+    vfpframe = (struct target_vfp_sigframe *)regspace;
+
+    __get_user(magic, &vfpframe->magic);
+    __get_user(sz, &vfpframe->size);
+    if (magic != TARGET_VFP_MAGIC || sz != sizeof(*vfpframe)) {
+        return 0;
+    }
+    for (i = 0; i < 32; i++) {
+        __get_user(*aa32_vfp_dreg(env, i), &vfpframe->ufp.fpregs[i]);
+    }
+    __get_user(fpscr, &vfpframe->ufp.fpscr);
+    vfp_set_fpscr(env, fpscr);
+    __get_user(fpexc, &vfpframe->ufp_exc.fpexc);
+    /* Sanitise FPEXC: ensure VFP is enabled, FPINST2 is invalid
+     * and the exception flag is cleared
+     */
+    fpexc |= (1 << 30);
+    fpexc &= ~((1 << 31) | (1 << 28));
+    env->vfp.xregs[ARM_VFP_FPEXC] = fpexc;
+    __get_user(env->vfp.xregs[ARM_VFP_FPINST], &vfpframe->ufp_exc.fpinst);
+    __get_user(env->vfp.xregs[ARM_VFP_FPINST2], &vfpframe->ufp_exc.fpinst2);
+    return (abi_ulong*)(vfpframe + 1);
+}
+
+static abi_ulong *restore_sigframe_v2_iwmmxt(CPUARMState *env,
+                                             abi_ulong *regspace)
+{
+    int i;
+    abi_ulong magic, sz;
+    struct target_iwmmxt_sigframe *iwmmxtframe;
+    iwmmxtframe = (struct target_iwmmxt_sigframe *)regspace;
+
+    __get_user(magic, &iwmmxtframe->magic);
+    __get_user(sz, &iwmmxtframe->size);
+    if (magic != TARGET_IWMMXT_MAGIC || sz != sizeof(*iwmmxtframe)) {
+        return 0;
+    }
+    for (i = 0; i < 16; i++) {
+        __get_user(env->iwmmxt.regs[i], &iwmmxtframe->regs[i]);
+    }
+    __get_user(env->vfp.xregs[ARM_IWMMXT_wCSSF], &iwmmxtframe->wcssf);
+    __get_user(env->vfp.xregs[ARM_IWMMXT_wCASF], &iwmmxtframe->wcssf);
+    __get_user(env->vfp.xregs[ARM_IWMMXT_wCGR0], &iwmmxtframe->wcgr0);
+    __get_user(env->vfp.xregs[ARM_IWMMXT_wCGR1], &iwmmxtframe->wcgr1);
+    __get_user(env->vfp.xregs[ARM_IWMMXT_wCGR2], &iwmmxtframe->wcgr2);
+    __get_user(env->vfp.xregs[ARM_IWMMXT_wCGR3], &iwmmxtframe->wcgr3);
+    return (abi_ulong*)(iwmmxtframe + 1);
+}
+
+static int do_sigframe_return_v2(CPUARMState *env,
+                                 target_ulong context_addr,
+                                 struct target_ucontext_v2 *uc)
+{
+    sigset_t host_set;
+    abi_ulong *regspace;
+
+    target_to_host_sigset(&host_set, &uc->tuc_sigmask);
+    set_sigmask(&host_set);
+
+    if (restore_sigcontext(env, &uc->tuc_mcontext))
+        return 1;
+
+    /* Restore coprocessor signal frame */
+    regspace = uc->tuc_regspace;
+    if (arm_feature(env, ARM_FEATURE_VFP)) {
+        regspace = restore_sigframe_v2_vfp(env, regspace);
+        if (!regspace) {
+            return 1;
+        }
+    }
+    if (arm_feature(env, ARM_FEATURE_IWMMXT)) {
+        regspace = restore_sigframe_v2_iwmmxt(env, regspace);
+        if (!regspace) {
+            return 1;
+        }
+    }
+
+    if (do_sigaltstack(context_addr
+                       + offsetof(struct target_ucontext_v2, tuc_stack),
+                       0, get_sp_from_cpustate(env)) == -EFAULT) {
+        return 1;
+    }
+
+#if 0
+    /* Send SIGTRAP if we're single-stepping */
+    if (ptrace_cancel_bpt(current))
+        send_sig(SIGTRAP, current, 1);
+#endif
+
+    return 0;
+}
+
+static long do_sigreturn_v2(CPUARMState *env)
+{
+    abi_ulong frame_addr;
+    struct sigframe_v2 *frame = NULL;
+
+    /*
+     * Since we stacked the signal on a 64-bit boundary,
+     * then 'sp' should be word aligned here.  If it's
+     * not, then the user is trying to mess with us.
+     */
+    frame_addr = env->regs[13];
+    trace_user_do_sigreturn(env, frame_addr);
+    if (frame_addr & 7) {
+        goto badframe;
+    }
+
+    if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
+        goto badframe;
+    }
+
+    if (do_sigframe_return_v2(env,
+                              frame_addr
+                              + offsetof(struct sigframe_v2, uc),
+                              &frame->uc)) {
+        goto badframe;
+    }
+
+    unlock_user_struct(frame, frame_addr, 0);
+    return -TARGET_QEMU_ESIGRETURN;
+
+badframe:
+    unlock_user_struct(frame, frame_addr, 0);
+    force_sig(TARGET_SIGSEGV);
+    return -TARGET_QEMU_ESIGRETURN;
+}
+
+long do_sigreturn(CPUARMState *env)
+{
+    if (get_osversion() >= 0x020612) {
+        return do_sigreturn_v2(env);
+    } else {
+        return do_sigreturn_v1(env);
+    }
+}
+
+static long do_rt_sigreturn_v1(CPUARMState *env)
+{
+    abi_ulong frame_addr;
+    struct rt_sigframe_v1 *frame = NULL;
+    sigset_t host_set;
+
+    /*
+     * Since we stacked the signal on a 64-bit boundary,
+     * then 'sp' should be word aligned here.  If it's
+     * not, then the user is trying to mess with us.
+     */
+    frame_addr = env->regs[13];
+    trace_user_do_rt_sigreturn(env, frame_addr);
+    if (frame_addr & 7) {
+        goto badframe;
+    }
+
+    if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
+        goto badframe;
+    }
+
+    target_to_host_sigset(&host_set, &frame->uc.tuc_sigmask);
+    set_sigmask(&host_set);
+
+    if (restore_sigcontext(env, &frame->uc.tuc_mcontext)) {
+        goto badframe;
+    }
+
+    if (do_sigaltstack(frame_addr + offsetof(struct rt_sigframe_v1, uc.tuc_stack), 0, get_sp_from_cpustate(env)) == -EFAULT)
+        goto badframe;
+
+#if 0
+    /* Send SIGTRAP if we're single-stepping */
+    if (ptrace_cancel_bpt(current))
+        send_sig(SIGTRAP, current, 1);
+#endif
+    unlock_user_struct(frame, frame_addr, 0);
+    return -TARGET_QEMU_ESIGRETURN;
+
+badframe:
+    unlock_user_struct(frame, frame_addr, 0);
+    force_sig(TARGET_SIGSEGV);
+    return -TARGET_QEMU_ESIGRETURN;
+}
+
+static long do_rt_sigreturn_v2(CPUARMState *env)
+{
+    abi_ulong frame_addr;
+    struct rt_sigframe_v2 *frame = NULL;
+
+    /*
+     * Since we stacked the signal on a 64-bit boundary,
+     * then 'sp' should be word aligned here.  If it's
+     * not, then the user is trying to mess with us.
+     */
+    frame_addr = env->regs[13];
+    trace_user_do_rt_sigreturn(env, frame_addr);
+    if (frame_addr & 7) {
+        goto badframe;
+    }
+
+    if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
+        goto badframe;
+    }
+
+    if (do_sigframe_return_v2(env,
+                              frame_addr
+                              + offsetof(struct rt_sigframe_v2, uc),
+                              &frame->uc)) {
+        goto badframe;
+    }
+
+    unlock_user_struct(frame, frame_addr, 0);
+    return -TARGET_QEMU_ESIGRETURN;
+
+badframe:
+    unlock_user_struct(frame, frame_addr, 0);
+    force_sig(TARGET_SIGSEGV);
+    return -TARGET_QEMU_ESIGRETURN;
+}
+
+long do_rt_sigreturn(CPUARMState *env)
+{
+    if (get_osversion() >= 0x020612) {
+        return do_rt_sigreturn_v2(env);
+    } else {
+        return do_rt_sigreturn_v1(env);
+    }
+}
diff --git a/linux-user/arm/target_signal.h b/linux-user/arm/target_signal.h
index cbbeb09f4d..4b542c324f 100644
--- a/linux-user/arm/target_signal.h
+++ b/linux-user/arm/target_signal.h
@@ -26,5 +26,9 @@ static inline abi_ulong get_sp_from_cpustate(CPUARMState *state)
    return state->regs[13];
 }
 
-
+void setup_frame(int usig, struct target_sigaction *ka,
+                 target_sigset_t *set, CPUARMState *regs);
+void setup_rt_frame(int usig, struct target_sigaction *ka,
+                    target_siginfo_t *info,
+                    target_sigset_t *set, CPUARMState *env);
 #endif /* ARM_TARGET_SIGNAL_H */