Hexagon (linux-user/hexagon) Linux user emulation

Implementation of Linux user emulation for Hexagon
Some common files modified in addition to new files in linux-user/hexagon

Acked-by: Laurent Vivier <laurent@vivier.eu>
Signed-off-by: Taylor Simpson <tsimpson@quicinc.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <1612763186-18161-31-git-send-email-tsimpson@quicinc.com>
[rth: Fix termbits.h on review by Laurent]
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 276 insertions, 0 deletions

diff --git a/linux-user/hexagon/signal.c b/linux-user/hexagon/signal.c
new file mode 100644
index 0000000000..fde8dc93b7
--- /dev/null
+++ b/linux-user/hexagon/signal.c
@@ -0,0 +1,276 @@
+/*
+ *  Emulation of Linux signals
+ *
+ *  Copyright (c) 2003 Fabrice Bellard
+ *  Copyright(c) 2019-2021 Qualcomm Innovation Center, Inc. All Rights Reserved.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  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 "signal-common.h"
+#include "linux-user/trace.h"
+
+struct target_sigcontext {
+    target_ulong r0,  r1,  r2,  r3;
+    target_ulong r4,  r5,  r6,  r7;
+    target_ulong r8,  r9, r10, r11;
+    target_ulong r12, r13, r14, r15;
+    target_ulong r16, r17, r18, r19;
+    target_ulong r20, r21, r22, r23;
+    target_ulong r24, r25, r26, r27;
+    target_ulong r28, r29, r30, r31;
+    target_ulong sa0;
+    target_ulong lc0;
+    target_ulong sa1;
+    target_ulong lc1;
+    target_ulong m0;
+    target_ulong m1;
+    target_ulong usr;
+    target_ulong p3_0;
+    target_ulong gp;
+    target_ulong ugp;
+    target_ulong pc;
+    target_ulong cause;
+    target_ulong badva;
+    target_ulong pad1;
+    target_ulong pad2;
+    target_ulong pad3;
+};
+
+struct target_ucontext {
+    unsigned long uc_flags;
+    target_ulong uc_link; /* target pointer */
+    target_stack_t uc_stack;
+    struct target_sigcontext uc_mcontext;
+    target_sigset_t uc_sigmask;
+};
+
+struct target_rt_sigframe {
+    uint32_t tramp[2];
+    struct target_siginfo info;
+    struct target_ucontext uc;
+};
+
+static abi_ulong get_sigframe(struct target_sigaction *ka,
+                              CPUHexagonState *regs, size_t framesize)
+{
+    abi_ulong sp = get_sp_from_cpustate(regs);
+
+    /* This is the X/Open sanctioned signal stack switching.  */
+    sp = target_sigsp(sp, ka) - framesize;
+
+    sp = QEMU_ALIGN_DOWN(sp, 8);
+
+    return sp;
+}
+
+static void setup_sigcontext(struct target_sigcontext *sc, CPUHexagonState *env)
+{
+    __put_user(env->gpr[HEX_REG_R00], &sc->r0);
+    __put_user(env->gpr[HEX_REG_R01], &sc->r1);
+    __put_user(env->gpr[HEX_REG_R02], &sc->r2);
+    __put_user(env->gpr[HEX_REG_R03], &sc->r3);
+    __put_user(env->gpr[HEX_REG_R04], &sc->r4);
+    __put_user(env->gpr[HEX_REG_R05], &sc->r5);
+    __put_user(env->gpr[HEX_REG_R06], &sc->r6);
+    __put_user(env->gpr[HEX_REG_R07], &sc->r7);
+    __put_user(env->gpr[HEX_REG_R08], &sc->r8);
+    __put_user(env->gpr[HEX_REG_R09], &sc->r9);
+    __put_user(env->gpr[HEX_REG_R10], &sc->r10);
+    __put_user(env->gpr[HEX_REG_R11], &sc->r11);
+    __put_user(env->gpr[HEX_REG_R12], &sc->r12);
+    __put_user(env->gpr[HEX_REG_R13], &sc->r13);
+    __put_user(env->gpr[HEX_REG_R14], &sc->r14);
+    __put_user(env->gpr[HEX_REG_R15], &sc->r15);
+    __put_user(env->gpr[HEX_REG_R16], &sc->r16);
+    __put_user(env->gpr[HEX_REG_R17], &sc->r17);
+    __put_user(env->gpr[HEX_REG_R18], &sc->r18);
+    __put_user(env->gpr[HEX_REG_R19], &sc->r19);
+    __put_user(env->gpr[HEX_REG_R20], &sc->r20);
+    __put_user(env->gpr[HEX_REG_R21], &sc->r21);
+    __put_user(env->gpr[HEX_REG_R22], &sc->r22);
+    __put_user(env->gpr[HEX_REG_R23], &sc->r23);
+    __put_user(env->gpr[HEX_REG_R24], &sc->r24);
+    __put_user(env->gpr[HEX_REG_R25], &sc->r25);
+    __put_user(env->gpr[HEX_REG_R26], &sc->r26);
+    __put_user(env->gpr[HEX_REG_R27], &sc->r27);
+    __put_user(env->gpr[HEX_REG_R28], &sc->r28);
+    __put_user(env->gpr[HEX_REG_R29], &sc->r29);
+    __put_user(env->gpr[HEX_REG_R30], &sc->r30);
+    __put_user(env->gpr[HEX_REG_R31], &sc->r31);
+    __put_user(env->gpr[HEX_REG_SA0], &sc->sa0);
+    __put_user(env->gpr[HEX_REG_LC0], &sc->lc0);
+    __put_user(env->gpr[HEX_REG_SA1], &sc->sa1);
+    __put_user(env->gpr[HEX_REG_LC1], &sc->lc1);
+    __put_user(env->gpr[HEX_REG_M0], &sc->m0);
+    __put_user(env->gpr[HEX_REG_M1], &sc->m1);
+    __put_user(env->gpr[HEX_REG_USR], &sc->usr);
+    __put_user(env->gpr[HEX_REG_P3_0], &sc->p3_0);
+    __put_user(env->gpr[HEX_REG_GP], &sc->gp);
+    __put_user(env->gpr[HEX_REG_UGP], &sc->ugp);
+    __put_user(env->gpr[HEX_REG_PC], &sc->pc);
+}
+
+static void setup_ucontext(struct target_ucontext *uc,
+                           CPUHexagonState *env, target_sigset_t *set)
+{
+    __put_user(0,    &(uc->uc_flags));
+    __put_user(0,    &(uc->uc_link));
+
+    target_save_altstack(&uc->uc_stack, env);
+
+    int i;
+    for (i = 0; i < TARGET_NSIG_WORDS; i++) {
+        __put_user(set->sig[i], &(uc->uc_sigmask.sig[i]));
+    }
+
+    setup_sigcontext(&uc->uc_mcontext, env);
+}
+
+static inline void install_sigtramp(uint32_t *tramp)
+{
+    __put_user(0x7800d166, tramp + 0); /*  { r6=#__NR_rt_sigreturn } */
+    __put_user(0x5400c004, tramp + 1); /*  { trap0(#1) } */
+}
+
+void setup_rt_frame(int sig, struct target_sigaction *ka,
+                    target_siginfo_t *info,
+                    target_sigset_t *set, CPUHexagonState *env)
+{
+    abi_ulong frame_addr;
+    struct target_rt_sigframe *frame;
+
+    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 badframe;
+    }
+
+    setup_ucontext(&frame->uc, env, set);
+    tswap_siginfo(&frame->info, info);
+    install_sigtramp(frame->tramp);
+
+    env->gpr[HEX_REG_PC] = ka->_sa_handler;
+    env->gpr[HEX_REG_SP] = frame_addr;
+    env->gpr[HEX_REG_R00] = sig;
+    env->gpr[HEX_REG_R01] =
+        frame_addr + offsetof(struct target_rt_sigframe, info);
+    env->gpr[HEX_REG_R02] =
+        frame_addr + offsetof(struct target_rt_sigframe, uc);
+    env->gpr[HEX_REG_LR] =
+        frame_addr + offsetof(struct target_rt_sigframe, tramp);
+
+    return;
+
+badframe:
+    unlock_user_struct(frame, frame_addr, 1);
+    if (sig == TARGET_SIGSEGV) {
+        ka->_sa_handler = TARGET_SIG_DFL;
+    }
+    force_sig(TARGET_SIGSEGV);
+}
+
+static void restore_sigcontext(CPUHexagonState *env,
+                               struct target_sigcontext *sc)
+{
+    __get_user(env->gpr[HEX_REG_R00], &sc->r0);
+    __get_user(env->gpr[HEX_REG_R01], &sc->r1);
+    __get_user(env->gpr[HEX_REG_R02], &sc->r2);
+    __get_user(env->gpr[HEX_REG_R03], &sc->r3);
+    __get_user(env->gpr[HEX_REG_R04], &sc->r4);
+    __get_user(env->gpr[HEX_REG_R05], &sc->r5);
+    __get_user(env->gpr[HEX_REG_R06], &sc->r6);
+    __get_user(env->gpr[HEX_REG_R07], &sc->r7);
+    __get_user(env->gpr[HEX_REG_R08], &sc->r8);
+    __get_user(env->gpr[HEX_REG_R09], &sc->r9);
+    __get_user(env->gpr[HEX_REG_R10], &sc->r10);
+    __get_user(env->gpr[HEX_REG_R11], &sc->r11);
+    __get_user(env->gpr[HEX_REG_R12], &sc->r12);
+    __get_user(env->gpr[HEX_REG_R13], &sc->r13);
+    __get_user(env->gpr[HEX_REG_R14], &sc->r14);
+    __get_user(env->gpr[HEX_REG_R15], &sc->r15);
+    __get_user(env->gpr[HEX_REG_R16], &sc->r16);
+    __get_user(env->gpr[HEX_REG_R17], &sc->r17);
+    __get_user(env->gpr[HEX_REG_R18], &sc->r18);
+    __get_user(env->gpr[HEX_REG_R19], &sc->r19);
+    __get_user(env->gpr[HEX_REG_R20], &sc->r20);
+    __get_user(env->gpr[HEX_REG_R21], &sc->r21);
+    __get_user(env->gpr[HEX_REG_R22], &sc->r22);
+    __get_user(env->gpr[HEX_REG_R23], &sc->r23);
+    __get_user(env->gpr[HEX_REG_R24], &sc->r24);
+    __get_user(env->gpr[HEX_REG_R25], &sc->r25);
+    __get_user(env->gpr[HEX_REG_R26], &sc->r26);
+    __get_user(env->gpr[HEX_REG_R27], &sc->r27);
+    __get_user(env->gpr[HEX_REG_R28], &sc->r28);
+    __get_user(env->gpr[HEX_REG_R29], &sc->r29);
+    __get_user(env->gpr[HEX_REG_R30], &sc->r30);
+    __get_user(env->gpr[HEX_REG_R31], &sc->r31);
+    __get_user(env->gpr[HEX_REG_SA0], &sc->sa0);
+    __get_user(env->gpr[HEX_REG_LC0], &sc->lc0);
+    __get_user(env->gpr[HEX_REG_SA1], &sc->sa1);
+    __get_user(env->gpr[HEX_REG_LC1], &sc->lc1);
+    __get_user(env->gpr[HEX_REG_M0], &sc->m0);
+    __get_user(env->gpr[HEX_REG_M1], &sc->m1);
+    __get_user(env->gpr[HEX_REG_USR], &sc->usr);
+    __get_user(env->gpr[HEX_REG_P3_0], &sc->p3_0);
+    __get_user(env->gpr[HEX_REG_GP], &sc->gp);
+    __get_user(env->gpr[HEX_REG_UGP], &sc->ugp);
+    __get_user(env->gpr[HEX_REG_PC], &sc->pc);
+}
+
+static void restore_ucontext(CPUHexagonState *env, struct target_ucontext *uc)
+{
+    sigset_t blocked;
+    target_sigset_t target_set;
+    int i;
+
+    target_sigemptyset(&target_set);
+    for (i = 0; i < TARGET_NSIG_WORDS; i++) {
+        __get_user(target_set.sig[i], &(uc->uc_sigmask.sig[i]));
+    }
+
+    target_to_host_sigset_internal(&blocked, &target_set);
+    set_sigmask(&blocked);
+
+    restore_sigcontext(env, &uc->uc_mcontext);
+}
+
+long do_rt_sigreturn(CPUHexagonState *env)
+{
+    struct target_rt_sigframe *frame;
+    abi_ulong frame_addr;
+
+    frame_addr = env->gpr[HEX_REG_SP];
+    trace_user_do_sigreturn(env, frame_addr);
+    if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
+        goto badframe;
+    }
+
+    restore_ucontext(env, &frame->uc);
+
+    if (do_sigaltstack(frame_addr + offsetof(struct target_rt_sigframe,
+            uc.uc_stack), 0, get_sp_from_cpustate(env)) == -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 0;
+}