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

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

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20180424192635.6027-12-laurent@vivier.eu>

2 files changed, 267 insertions, 0 deletions

diff --git a/linux-user/alpha/signal.c b/linux-user/alpha/signal.c
index 02ca338b6c..a8c718f2c6 100644
--- a/linux-user/alpha/signal.c
+++ b/linux-user/alpha/signal.c
@@ -16,3 +16,265 @@
  *  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_long sc_onstack;
+    abi_long sc_mask;
+    abi_long sc_pc;
+    abi_long sc_ps;
+    abi_long sc_regs[32];
+    abi_long sc_ownedfp;
+    abi_long sc_fpregs[32];
+    abi_ulong sc_fpcr;
+    abi_ulong sc_fp_control;
+    abi_ulong sc_reserved1;
+    abi_ulong sc_reserved2;
+    abi_ulong sc_ssize;
+    abi_ulong sc_sbase;
+    abi_ulong sc_traparg_a0;
+    abi_ulong sc_traparg_a1;
+    abi_ulong sc_traparg_a2;
+    abi_ulong sc_fp_trap_pc;
+    abi_ulong sc_fp_trigger_sum;
+    abi_ulong sc_fp_trigger_inst;
+};
+
+struct target_ucontext {
+    abi_ulong tuc_flags;
+    abi_ulong tuc_link;
+    abi_ulong tuc_osf_sigmask;
+    target_stack_t tuc_stack;
+    struct target_sigcontext tuc_mcontext;
+    target_sigset_t tuc_sigmask;
+};
+
+struct target_sigframe {
+    struct target_sigcontext sc;
+    unsigned int retcode[3];
+};
+
+struct target_rt_sigframe {
+    target_siginfo_t info;
+    struct target_ucontext uc;
+    unsigned int retcode[3];
+};
+
+#define INSN_MOV_R30_R16        0x47fe0410
+#define INSN_LDI_R0             0x201f0000
+#define INSN_CALLSYS            0x00000083
+
+static void setup_sigcontext(struct target_sigcontext *sc, CPUAlphaState *env,
+                             abi_ulong frame_addr, target_sigset_t *set)
+{
+    int i;
+
+    __put_user(on_sig_stack(frame_addr), &sc->sc_onstack);
+    __put_user(set->sig[0], &sc->sc_mask);
+    __put_user(env->pc, &sc->sc_pc);
+    __put_user(8, &sc->sc_ps);
+
+    for (i = 0; i < 31; ++i) {
+        __put_user(env->ir[i], &sc->sc_regs[i]);
+    }
+    __put_user(0, &sc->sc_regs[31]);
+
+    for (i = 0; i < 31; ++i) {
+        __put_user(env->fir[i], &sc->sc_fpregs[i]);
+    }
+    __put_user(0, &sc->sc_fpregs[31]);
+    __put_user(cpu_alpha_load_fpcr(env), &sc->sc_fpcr);
+
+    __put_user(0, &sc->sc_traparg_a0); /* FIXME */
+    __put_user(0, &sc->sc_traparg_a1); /* FIXME */
+    __put_user(0, &sc->sc_traparg_a2); /* FIXME */
+}
+
+static void restore_sigcontext(CPUAlphaState *env,
+                               struct target_sigcontext *sc)
+{
+    uint64_t fpcr;
+    int i;
+
+    __get_user(env->pc, &sc->sc_pc);
+
+    for (i = 0; i < 31; ++i) {
+        __get_user(env->ir[i], &sc->sc_regs[i]);
+    }
+    for (i = 0; i < 31; ++i) {
+        __get_user(env->fir[i], &sc->sc_fpregs[i]);
+    }
+
+    __get_user(fpcr, &sc->sc_fpcr);
+    cpu_alpha_store_fpcr(env, fpcr);
+}
+
+static inline abi_ulong get_sigframe(struct target_sigaction *sa,
+                                     CPUAlphaState *env,
+                                     unsigned long framesize)
+{
+    abi_ulong sp = env->ir[IR_SP];
+
+    /* This is the X/Open sanctioned signal stack switching.  */
+    if ((sa->sa_flags & TARGET_SA_ONSTACK) != 0 && !sas_ss_flags(sp)) {
+        sp = target_sigaltstack_used.ss_sp + target_sigaltstack_used.ss_size;
+    }
+    return (sp - framesize) & -32;
+}
+
+void setup_frame(int sig, struct target_sigaction *ka,
+                 target_sigset_t *set, CPUAlphaState *env)
+{
+    abi_ulong frame_addr, r26;
+    struct target_sigframe *frame;
+    int err = 0;
+
+    frame_addr = get_sigframe(ka, env, sizeof(*frame));
+    trace_user_setup_frame(env, frame_addr);
+    if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
+        goto give_sigsegv;
+    }
+
+    setup_sigcontext(&frame->sc, env, frame_addr, set);
+
+    if (ka->sa_restorer) {
+        r26 = ka->sa_restorer;
+    } else {
+        __put_user(INSN_MOV_R30_R16, &frame->retcode[0]);
+        __put_user(INSN_LDI_R0 + TARGET_NR_sigreturn,
+                   &frame->retcode[1]);
+        __put_user(INSN_CALLSYS, &frame->retcode[2]);
+        /* imb() */
+        r26 = frame_addr + offsetof(struct target_sigframe, retcode);
+    }
+
+    unlock_user_struct(frame, frame_addr, 1);
+
+    if (err) {
+give_sigsegv:
+        force_sigsegv(sig);
+        return;
+    }
+
+    env->ir[IR_RA] = r26;
+    env->ir[IR_PV] = env->pc = ka->_sa_handler;
+    env->ir[IR_A0] = sig;
+    env->ir[IR_A1] = 0;
+    env->ir[IR_A2] = frame_addr + offsetof(struct target_sigframe, sc);
+    env->ir[IR_SP] = frame_addr;
+}
+
+void setup_rt_frame(int sig, struct target_sigaction *ka,
+                    target_siginfo_t *info,
+                    target_sigset_t *set, CPUAlphaState *env)
+{
+    abi_ulong frame_addr, r26;
+    struct target_rt_sigframe *frame;
+    int i, err = 0;
+
+    frame_addr = get_sigframe(ka, env, sizeof(*frame));
+    trace_user_setup_rt_frame(env, frame_addr);
+    if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
+        goto give_sigsegv;
+    }
+
+    tswap_siginfo(&frame->info, info);
+
+    __put_user(0, &frame->uc.tuc_flags);
+    __put_user(0, &frame->uc.tuc_link);
+    __put_user(set->sig[0], &frame->uc.tuc_osf_sigmask);
+    __put_user(target_sigaltstack_used.ss_sp,
+               &frame->uc.tuc_stack.ss_sp);
+    __put_user(sas_ss_flags(env->ir[IR_SP]),
+               &frame->uc.tuc_stack.ss_flags);
+    __put_user(target_sigaltstack_used.ss_size,
+               &frame->uc.tuc_stack.ss_size);
+    setup_sigcontext(&frame->uc.tuc_mcontext, env, frame_addr, set);
+    for (i = 0; i < TARGET_NSIG_WORDS; ++i) {
+        __put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i]);
+    }
+
+    if (ka->sa_restorer) {
+        r26 = ka->sa_restorer;
+    } else {
+        __put_user(INSN_MOV_R30_R16, &frame->retcode[0]);
+        __put_user(INSN_LDI_R0 + TARGET_NR_rt_sigreturn,
+                   &frame->retcode[1]);
+        __put_user(INSN_CALLSYS, &frame->retcode[2]);
+        /* imb(); */
+        r26 = frame_addr + offsetof(struct target_sigframe, retcode);
+    }
+
+    if (err) {
+give_sigsegv:
+        force_sigsegv(sig);
+        return;
+    }
+
+    env->ir[IR_RA] = r26;
+    env->ir[IR_PV] = env->pc = ka->_sa_handler;
+    env->ir[IR_A0] = sig;
+    env->ir[IR_A1] = frame_addr + offsetof(struct target_rt_sigframe, info);
+    env->ir[IR_A2] = frame_addr + offsetof(struct target_rt_sigframe, uc);
+    env->ir[IR_SP] = frame_addr;
+}
+
+long do_sigreturn(CPUAlphaState *env)
+{
+    struct target_sigcontext *sc;
+    abi_ulong sc_addr = env->ir[IR_A0];
+    target_sigset_t target_set;
+    sigset_t set;
+
+    if (!lock_user_struct(VERIFY_READ, sc, sc_addr, 1)) {
+        goto badframe;
+    }
+
+    target_sigemptyset(&target_set);
+    __get_user(target_set.sig[0], &sc->sc_mask);
+
+    target_to_host_sigset_internal(&set, &target_set);
+    set_sigmask(&set);
+
+    restore_sigcontext(env, sc);
+    unlock_user_struct(sc, sc_addr, 0);
+    return -TARGET_QEMU_ESIGRETURN;
+
+badframe:
+    force_sig(TARGET_SIGSEGV);
+    return -TARGET_QEMU_ESIGRETURN;
+}
+
+long do_rt_sigreturn(CPUAlphaState *env)
+{
+    abi_ulong frame_addr = env->ir[IR_A0];
+    struct target_rt_sigframe *frame;
+    sigset_t set;
+
+    trace_user_do_rt_sigreturn(env, frame_addr);
+    if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
+        goto badframe;
+    }
+    target_to_host_sigset(&set, &frame->uc.tuc_sigmask);
+    set_sigmask(&set);
+
+    restore_sigcontext(env, &frame->uc.tuc_mcontext);
+    if (do_sigaltstack(frame_addr + offsetof(struct target_rt_sigframe,
+                                             uc.tuc_stack),
+                       0, env->ir[IR_SP]) == -EFAULT) {
+        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;
+}
diff --git a/linux-user/alpha/target_signal.h b/linux-user/alpha/target_signal.h
index f1ed00d50e..42343a1ae6 100644
--- a/linux-user/alpha/target_signal.h
+++ b/linux-user/alpha/target_signal.h
@@ -55,4 +55,9 @@ static inline abi_ulong get_sp_from_cpustate(CPUAlphaState *state)
 #define TARGET_GEN_SUBRNG6     -24
 #define TARGET_GEN_SUBRNG7     -25
 
+void setup_frame(int sig, struct target_sigaction *ka,
+                 target_sigset_t *set, CPUAlphaState *env);
+void setup_rt_frame(int sig, struct target_sigaction *ka,
+                    target_siginfo_t *info,
+                    target_sigset_t *set, CPUAlphaState *env);
 #endif /* ALPHA_TARGET_SIGNAL_H */