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

No code change, only move code from signal.c to
cris/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: <20180424192635.6027-7-laurent@vivier.eu>

2 files changed, 176 insertions, 1 deletions

diff --git a/linux-user/cris/signal.c b/linux-user/cris/signal.c
index 02ca338b6c..322d9db1a7 100644
--- a/linux-user/cris/signal.c
+++ b/linux-user/cris/signal.c
@@ -16,3 +16,174 @@
  *  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 {
+    struct target_pt_regs regs;  /* needs to be first */
+    uint32_t oldmask;
+    uint32_t usp;    /* usp before stacking this gunk on it */
+};
+
+/* Signal frames. */
+struct target_signal_frame {
+    struct target_sigcontext sc;
+    uint32_t extramask[TARGET_NSIG_WORDS - 1];
+    uint16_t retcode[4];      /* Trampoline code. */
+};
+
+struct rt_signal_frame {
+    siginfo_t *pinfo;
+    void *puc;
+    siginfo_t info;
+    ucontext_t uc;
+    uint16_t retcode[4];      /* Trampoline code. */
+};
+
+static void setup_sigcontext(struct target_sigcontext *sc, CPUCRISState *env)
+{
+    __put_user(env->regs[0], &sc->regs.r0);
+    __put_user(env->regs[1], &sc->regs.r1);
+    __put_user(env->regs[2], &sc->regs.r2);
+    __put_user(env->regs[3], &sc->regs.r3);
+    __put_user(env->regs[4], &sc->regs.r4);
+    __put_user(env->regs[5], &sc->regs.r5);
+    __put_user(env->regs[6], &sc->regs.r6);
+    __put_user(env->regs[7], &sc->regs.r7);
+    __put_user(env->regs[8], &sc->regs.r8);
+    __put_user(env->regs[9], &sc->regs.r9);
+    __put_user(env->regs[10], &sc->regs.r10);
+    __put_user(env->regs[11], &sc->regs.r11);
+    __put_user(env->regs[12], &sc->regs.r12);
+    __put_user(env->regs[13], &sc->regs.r13);
+    __put_user(env->regs[14], &sc->usp);
+    __put_user(env->regs[15], &sc->regs.acr);
+    __put_user(env->pregs[PR_MOF], &sc->regs.mof);
+    __put_user(env->pregs[PR_SRP], &sc->regs.srp);
+    __put_user(env->pc, &sc->regs.erp);
+}
+
+static void restore_sigcontext(struct target_sigcontext *sc, CPUCRISState *env)
+{
+    __get_user(env->regs[0], &sc->regs.r0);
+    __get_user(env->regs[1], &sc->regs.r1);
+    __get_user(env->regs[2], &sc->regs.r2);
+    __get_user(env->regs[3], &sc->regs.r3);
+    __get_user(env->regs[4], &sc->regs.r4);
+    __get_user(env->regs[5], &sc->regs.r5);
+    __get_user(env->regs[6], &sc->regs.r6);
+    __get_user(env->regs[7], &sc->regs.r7);
+    __get_user(env->regs[8], &sc->regs.r8);
+    __get_user(env->regs[9], &sc->regs.r9);
+    __get_user(env->regs[10], &sc->regs.r10);
+    __get_user(env->regs[11], &sc->regs.r11);
+    __get_user(env->regs[12], &sc->regs.r12);
+    __get_user(env->regs[13], &sc->regs.r13);
+    __get_user(env->regs[14], &sc->usp);
+    __get_user(env->regs[15], &sc->regs.acr);
+    __get_user(env->pregs[PR_MOF], &sc->regs.mof);
+    __get_user(env->pregs[PR_SRP], &sc->regs.srp);
+    __get_user(env->pc, &sc->regs.erp);
+}
+
+static abi_ulong get_sigframe(CPUCRISState *env, int framesize)
+{
+    abi_ulong sp;
+    /* Align the stack downwards to 4.  */
+    sp = (env->regs[R_SP] & ~3);
+    return sp - framesize;
+}
+
+void setup_frame(int sig, struct target_sigaction *ka,
+                 target_sigset_t *set, CPUCRISState *env)
+{
+    struct target_signal_frame *frame;
+    abi_ulong frame_addr;
+    int i;
+
+    frame_addr = get_sigframe(env, sizeof *frame);
+    trace_user_setup_frame(env, frame_addr);
+    if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0))
+        goto badframe;
+
+    /*
+     * The CRIS signal return trampoline. A real linux/CRIS kernel doesn't
+     * use this trampoline anymore but it sets it up for GDB.
+     * In QEMU, using the trampoline simplifies things a bit so we use it.
+     *
+     * This is movu.w __NR_sigreturn, r9; break 13;
+     */
+    __put_user(0x9c5f, frame->retcode+0);
+    __put_user(TARGET_NR_sigreturn,
+               frame->retcode + 1);
+    __put_user(0xe93d, frame->retcode + 2);
+
+    /* Save the mask.  */
+    __put_user(set->sig[0], &frame->sc.oldmask);
+
+    for(i = 1; i < TARGET_NSIG_WORDS; i++) {
+        __put_user(set->sig[i], &frame->extramask[i - 1]);
+    }
+
+    setup_sigcontext(&frame->sc, env);
+
+    /* Move the stack and setup the arguments for the handler.  */
+    env->regs[R_SP] = frame_addr;
+    env->regs[10] = sig;
+    env->pc = (unsigned long) ka->_sa_handler;
+    /* Link SRP so the guest returns through the trampoline.  */
+    env->pregs[PR_SRP] = frame_addr + offsetof(typeof(*frame), retcode);
+
+    unlock_user_struct(frame, frame_addr, 1);
+    return;
+badframe:
+    force_sigsegv(sig);
+}
+
+void setup_rt_frame(int sig, struct target_sigaction *ka,
+                    target_siginfo_t *info,
+                     target_sigset_t *set, CPUCRISState *env)
+{
+    fprintf(stderr, "CRIS setup_rt_frame: not implemented\n");
+}
+
+long do_sigreturn(CPUCRISState *env)
+{
+    struct target_signal_frame *frame;
+    abi_ulong frame_addr;
+    target_sigset_t target_set;
+    sigset_t set;
+    int i;
+
+    frame_addr = env->regs[R_SP];
+    trace_user_do_sigreturn(env, frame_addr);
+    /* Make sure the guest isn't playing games.  */
+    if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 1)) {
+        goto badframe;
+    }
+
+    /* Restore blocked signals */
+    __get_user(target_set.sig[0], &frame->sc.oldmask);
+    for(i = 1; i < TARGET_NSIG_WORDS; i++) {
+        __get_user(target_set.sig[i], &frame->extramask[i - 1]);
+    }
+    target_to_host_sigset_internal(&set, &target_set);
+    set_sigmask(&set);
+
+    restore_sigcontext(&frame->sc, env);
+    unlock_user_struct(frame, frame_addr, 0);
+    return -TARGET_QEMU_ESIGRETURN;
+badframe:
+    force_sig(TARGET_SIGSEGV);
+    return -TARGET_QEMU_ESIGRETURN;
+}
+
+long do_rt_sigreturn(CPUCRISState *env)
+{
+    trace_user_do_rt_sigreturn(env, 0);
+    fprintf(stderr, "CRIS do_rt_sigreturn: not implemented\n");
+    return -TARGET_ENOSYS;
+}
diff --git a/linux-user/cris/target_signal.h b/linux-user/cris/target_signal.h
index 664621bbcd..19c0d7b539 100644
--- a/linux-user/cris/target_signal.h
+++ b/linux-user/cris/target_signal.h
@@ -26,5 +26,9 @@ static inline abi_ulong get_sp_from_cpustate(CPUCRISState *state)
     return state->regs[14];
 }
 
-
+void setup_frame(int sig, struct target_sigaction *ka,
+                 target_sigset_t *set, CPUCRISState *env);
+void setup_rt_frame(int sig, struct target_sigaction *ka,
+                    target_siginfo_t *info,
+                     target_sigset_t *set, CPUCRISState *env);
 #endif /* CRIS_TARGET_SIGNAL_H */