linux-user: move aarch64 signal.c parts to aarch64 directory

No code change, only move code from signal.c to
aarch64/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: <20180424192635.6027-3-laurent@vivier.eu>

1 files changed, 1 insertions, 566 deletions

diff --git a/linux-user/signal.c b/linux-user/signal.c
index 0f95674..fcfa023 100644
--- a/linux-user/signal.c
+++ b/linux-user/signal.c
@@ -1383,572 +1383,7 @@ badframe:
     return -TARGET_QEMU_ESIGRETURN;
 }
 
-#elif defined(TARGET_AARCH64)
-
-struct target_sigcontext {
-    uint64_t fault_address;
-    /* AArch64 registers */
-    uint64_t regs[31];
-    uint64_t sp;
-    uint64_t pc;
-    uint64_t pstate;
-    /* 4K reserved for FP/SIMD state and future expansion */
-    char __reserved[4096] __attribute__((__aligned__(16)));
-};
-
-struct target_ucontext {
-    abi_ulong tuc_flags;
-    abi_ulong tuc_link;
-    target_stack_t tuc_stack;
-    target_sigset_t tuc_sigmask;
-    /* glibc uses a 1024-bit sigset_t */
-    char __unused[1024 / 8 - sizeof(target_sigset_t)];
-    /* last for future expansion */
-    struct target_sigcontext tuc_mcontext;
-};
-
-/*
- * Header to be used at the beginning of structures extending the user
- * context. Such structures must be placed after the rt_sigframe on the stack
- * and be 16-byte aligned. The last structure must be a dummy one with the
- * magic and size set to 0.
- */
-struct target_aarch64_ctx {
-    uint32_t magic;
-    uint32_t size;
-};
-
-#define TARGET_FPSIMD_MAGIC 0x46508001
-
-struct target_fpsimd_context {
-    struct target_aarch64_ctx head;
-    uint32_t fpsr;
-    uint32_t fpcr;
-    uint64_t vregs[32 * 2]; /* really uint128_t vregs[32] */
-};
-
-#define TARGET_EXTRA_MAGIC  0x45585401
-
-struct target_extra_context {
-    struct target_aarch64_ctx head;
-    uint64_t datap; /* 16-byte aligned pointer to extra space cast to __u64 */
-    uint32_t size; /* size in bytes of the extra space */
-    uint32_t reserved[3];
-};
-
-#define TARGET_SVE_MAGIC    0x53564501
-
-struct target_sve_context {
-    struct target_aarch64_ctx head;
-    uint16_t vl;
-    uint16_t reserved[3];
-    /* The actual SVE data immediately follows.  It is layed out
-     * according to TARGET_SVE_SIG_{Z,P}REG_OFFSET, based off of
-     * the original struct pointer.
-     */
-};
-
-#define TARGET_SVE_VQ_BYTES  16
-
-#define TARGET_SVE_SIG_ZREG_SIZE(VQ)  ((VQ) * TARGET_SVE_VQ_BYTES)
-#define TARGET_SVE_SIG_PREG_SIZE(VQ)  ((VQ) * (TARGET_SVE_VQ_BYTES / 8))
-
-#define TARGET_SVE_SIG_REGS_OFFSET \
-    QEMU_ALIGN_UP(sizeof(struct target_sve_context), TARGET_SVE_VQ_BYTES)
-#define TARGET_SVE_SIG_ZREG_OFFSET(VQ, N) \
-    (TARGET_SVE_SIG_REGS_OFFSET + TARGET_SVE_SIG_ZREG_SIZE(VQ) * (N))
-#define TARGET_SVE_SIG_PREG_OFFSET(VQ, N) \
-    (TARGET_SVE_SIG_ZREG_OFFSET(VQ, 32) + TARGET_SVE_SIG_PREG_SIZE(VQ) * (N))
-#define TARGET_SVE_SIG_FFR_OFFSET(VQ) \
-    (TARGET_SVE_SIG_PREG_OFFSET(VQ, 16))
-#define TARGET_SVE_SIG_CONTEXT_SIZE(VQ) \
-    (TARGET_SVE_SIG_PREG_OFFSET(VQ, 17))
-
-struct target_rt_sigframe {
-    struct target_siginfo info;
-    struct target_ucontext uc;
-};
-
-struct target_rt_frame_record {
-    uint64_t fp;
-    uint64_t lr;
-    uint32_t tramp[2];
-};
-
-static void target_setup_general_frame(struct target_rt_sigframe *sf,
-                                       CPUARMState *env, target_sigset_t *set)
-{
-    int i;
-
-    __put_user(0, &sf->uc.tuc_flags);
-    __put_user(0, &sf->uc.tuc_link);
-
-    __put_user(target_sigaltstack_used.ss_sp, &sf->uc.tuc_stack.ss_sp);
-    __put_user(sas_ss_flags(env->xregs[31]), &sf->uc.tuc_stack.ss_flags);
-    __put_user(target_sigaltstack_used.ss_size, &sf->uc.tuc_stack.ss_size);
-
-    for (i = 0; i < 31; i++) {
-        __put_user(env->xregs[i], &sf->uc.tuc_mcontext.regs[i]);
-    }
-    __put_user(env->xregs[31], &sf->uc.tuc_mcontext.sp);
-    __put_user(env->pc, &sf->uc.tuc_mcontext.pc);
-    __put_user(pstate_read(env), &sf->uc.tuc_mcontext.pstate);
-
-    __put_user(env->exception.vaddress, &sf->uc.tuc_mcontext.fault_address);
-
-    for (i = 0; i < TARGET_NSIG_WORDS; i++) {
-        __put_user(set->sig[i], &sf->uc.tuc_sigmask.sig[i]);
-    }
-}
-
-static void target_setup_fpsimd_record(struct target_fpsimd_context *fpsimd,
-                                       CPUARMState *env)
-{
-    int i;
-
-    __put_user(TARGET_FPSIMD_MAGIC, &fpsimd->head.magic);
-    __put_user(sizeof(struct target_fpsimd_context), &fpsimd->head.size);
-    __put_user(vfp_get_fpsr(env), &fpsimd->fpsr);
-    __put_user(vfp_get_fpcr(env), &fpsimd->fpcr);
-
-    for (i = 0; i < 32; i++) {
-        uint64_t *q = aa64_vfp_qreg(env, i);
-#ifdef TARGET_WORDS_BIGENDIAN
-        __put_user(q[0], &fpsimd->vregs[i * 2 + 1]);
-        __put_user(q[1], &fpsimd->vregs[i * 2]);
-#else
-        __put_user(q[0], &fpsimd->vregs[i * 2]);
-        __put_user(q[1], &fpsimd->vregs[i * 2 + 1]);
-#endif
-    }
-}
-
-static void target_setup_extra_record(struct target_extra_context *extra,
-                                      uint64_t datap, uint32_t extra_size)
-{
-    __put_user(TARGET_EXTRA_MAGIC, &extra->head.magic);
-    __put_user(sizeof(struct target_extra_context), &extra->head.size);
-    __put_user(datap, &extra->datap);
-    __put_user(extra_size, &extra->size);
-}
-
-static void target_setup_end_record(struct target_aarch64_ctx *end)
-{
-    __put_user(0, &end->magic);
-    __put_user(0, &end->size);
-}
-
-static void target_setup_sve_record(struct target_sve_context *sve,
-                                    CPUARMState *env, int vq, int size)
-{
-    int i, j;
-
-    __put_user(TARGET_SVE_MAGIC, &sve->head.magic);
-    __put_user(size, &sve->head.size);
-    __put_user(vq * TARGET_SVE_VQ_BYTES, &sve->vl);
-
-    /* Note that SVE regs are stored as a byte stream, with each byte element
-     * at a subsequent address.  This corresponds to a little-endian store
-     * of our 64-bit hunks.
-     */
-    for (i = 0; i < 32; ++i) {
-        uint64_t *z = (void *)sve + TARGET_SVE_SIG_ZREG_OFFSET(vq, i);
-        for (j = 0; j < vq * 2; ++j) {
-            __put_user_e(env->vfp.zregs[i].d[j], z + j, le);
-        }
-    }
-    for (i = 0; i <= 16; ++i) {
-        uint16_t *p = (void *)sve + TARGET_SVE_SIG_PREG_OFFSET(vq, i);
-        for (j = 0; j < vq; ++j) {
-            uint64_t r = env->vfp.pregs[i].p[j >> 2];
-            __put_user_e(r >> ((j & 3) * 16), p + j, le);
-        }
-    }
-}
-
-static void target_restore_general_frame(CPUARMState *env,
-                                         struct target_rt_sigframe *sf)
-{
-    sigset_t set;
-    uint64_t pstate;
-    int i;
-
-    target_to_host_sigset(&set, &sf->uc.tuc_sigmask);
-    set_sigmask(&set);
-
-    for (i = 0; i < 31; i++) {
-        __get_user(env->xregs[i], &sf->uc.tuc_mcontext.regs[i]);
-    }
-
-    __get_user(env->xregs[31], &sf->uc.tuc_mcontext.sp);
-    __get_user(env->pc, &sf->uc.tuc_mcontext.pc);
-    __get_user(pstate, &sf->uc.tuc_mcontext.pstate);
-    pstate_write(env, pstate);
-}
-
-static void target_restore_fpsimd_record(CPUARMState *env,
-                                         struct target_fpsimd_context *fpsimd)
-{
-    uint32_t fpsr, fpcr;
-    int i;
-
-    __get_user(fpsr, &fpsimd->fpsr);
-    vfp_set_fpsr(env, fpsr);
-    __get_user(fpcr, &fpsimd->fpcr);
-    vfp_set_fpcr(env, fpcr);
-
-    for (i = 0; i < 32; i++) {
-        uint64_t *q = aa64_vfp_qreg(env, i);
-#ifdef TARGET_WORDS_BIGENDIAN
-        __get_user(q[0], &fpsimd->vregs[i * 2 + 1]);
-        __get_user(q[1], &fpsimd->vregs[i * 2]);
-#else
-        __get_user(q[0], &fpsimd->vregs[i * 2]);
-        __get_user(q[1], &fpsimd->vregs[i * 2 + 1]);
-#endif
-    }
-}
-
-static void target_restore_sve_record(CPUARMState *env,
-                                      struct target_sve_context *sve, int vq)
-{
-    int i, j;
-
-    /* Note that SVE regs are stored as a byte stream, with each byte element
-     * at a subsequent address.  This corresponds to a little-endian load
-     * of our 64-bit hunks.
-     */
-    for (i = 0; i < 32; ++i) {
-        uint64_t *z = (void *)sve + TARGET_SVE_SIG_ZREG_OFFSET(vq, i);
-        for (j = 0; j < vq * 2; ++j) {
-            __get_user_e(env->vfp.zregs[i].d[j], z + j, le);
-        }
-    }
-    for (i = 0; i <= 16; ++i) {
-        uint16_t *p = (void *)sve + TARGET_SVE_SIG_PREG_OFFSET(vq, i);
-        for (j = 0; j < vq; ++j) {
-            uint16_t r;
-            __get_user_e(r, p + j, le);
-            if (j & 3) {
-                env->vfp.pregs[i].p[j >> 2] |= (uint64_t)r << ((j & 3) * 16);
-            } else {
-                env->vfp.pregs[i].p[j >> 2] = r;
-            }
-        }
-    }
-}
-
-static int target_restore_sigframe(CPUARMState *env,
-                                   struct target_rt_sigframe *sf)
-{
-    struct target_aarch64_ctx *ctx, *extra = NULL;
-    struct target_fpsimd_context *fpsimd = NULL;
-    struct target_sve_context *sve = NULL;
-    uint64_t extra_datap = 0;
-    bool used_extra = false;
-    bool err = false;
-    int vq = 0, sve_size = 0;
-
-    target_restore_general_frame(env, sf);
-
-    ctx = (struct target_aarch64_ctx *)sf->uc.tuc_mcontext.__reserved;
-    while (ctx) {
-        uint32_t magic, size, extra_size;
-
-        __get_user(magic, &ctx->magic);
-        __get_user(size, &ctx->size);
-        switch (magic) {
-        case 0:
-            if (size != 0) {
-                err = true;
-                goto exit;
-            }
-            if (used_extra) {
-                ctx = NULL;
-            } else {
-                ctx = extra;
-                used_extra = true;
-            }
-            continue;
-
-        case TARGET_FPSIMD_MAGIC:
-            if (fpsimd || size != sizeof(struct target_fpsimd_context)) {
-                err = true;
-                goto exit;
-            }
-            fpsimd = (struct target_fpsimd_context *)ctx;
-            break;
-
-        case TARGET_SVE_MAGIC:
-            if (arm_feature(env, ARM_FEATURE_SVE)) {
-                vq = (env->vfp.zcr_el[1] & 0xf) + 1;
-                sve_size = QEMU_ALIGN_UP(TARGET_SVE_SIG_CONTEXT_SIZE(vq), 16);
-                if (!sve && size == sve_size) {
-                    sve = (struct target_sve_context *)ctx;
-                    break;
-                }
-            }
-            err = true;
-            goto exit;
-
-        case TARGET_EXTRA_MAGIC:
-            if (extra || size != sizeof(struct target_extra_context)) {
-                err = true;
-                goto exit;
-            }
-            __get_user(extra_datap,
-                       &((struct target_extra_context *)ctx)->datap);
-            __get_user(extra_size,
-                       &((struct target_extra_context *)ctx)->size);
-            extra = lock_user(VERIFY_READ, extra_datap, extra_size, 0);
-            break;
-
-        default:
-            /* Unknown record -- we certainly didn't generate it.
-             * Did we in fact get out of sync?
-             */
-            err = true;
-            goto exit;
-        }
-        ctx = (void *)ctx + size;
-    }
-
-    /* Require FPSIMD always.  */
-    if (fpsimd) {
-        target_restore_fpsimd_record(env, fpsimd);
-    } else {
-        err = true;
-    }
-
-    /* SVE data, if present, overwrites FPSIMD data.  */
-    if (sve) {
-        target_restore_sve_record(env, sve, vq);
-    }
-
- exit:
-    unlock_user(extra, extra_datap, 0);
-    return err;
-}
-
-static abi_ulong get_sigframe(struct target_sigaction *ka,
-                              CPUARMState *env, int size)
-{
-    abi_ulong sp;
-
-    sp = env->xregs[31];
-
-    /*
-     * 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;
-    }
-
-    sp = (sp - size) & ~15;
-
-    return sp;
-}
-
-typedef struct {
-    int total_size;
-    int extra_base;
-    int extra_size;
-    int std_end_ofs;
-    int extra_ofs;
-    int extra_end_ofs;
-} target_sigframe_layout;
-
-static int alloc_sigframe_space(int this_size, target_sigframe_layout *l)
-{
-    /* Make sure there will always be space for the end marker.  */
-    const int std_size = sizeof(struct target_rt_sigframe)
-                         - sizeof(struct target_aarch64_ctx);
-    int this_loc = l->total_size;
-
-    if (l->extra_base) {
-        /* Once we have begun an extra space, all allocations go there.  */
-        l->extra_size += this_size;
-    } else if (this_size + this_loc > std_size) {
-        /* This allocation does not fit in the standard space.  */
-        /* Allocate the extra record.  */
-        l->extra_ofs = this_loc;
-        l->total_size += sizeof(struct target_extra_context);
-
-        /* Allocate the standard end record.  */
-        l->std_end_ofs = l->total_size;
-        l->total_size += sizeof(struct target_aarch64_ctx);
-
-        /* Allocate the requested record.  */
-        l->extra_base = this_loc = l->total_size;
-        l->extra_size = this_size;
-    }
-    l->total_size += this_size;
-
-    return this_loc;
-}
-
-static void target_setup_frame(int usig, struct target_sigaction *ka,
-                               target_siginfo_t *info, target_sigset_t *set,
-                               CPUARMState *env)
-{
-    target_sigframe_layout layout = {
-        /* Begin with the size pointing to the reserved space.  */
-        .total_size = offsetof(struct target_rt_sigframe,
-                               uc.tuc_mcontext.__reserved),
-    };
-    int fpsimd_ofs, fr_ofs, sve_ofs = 0, vq = 0, sve_size = 0;
-    struct target_rt_sigframe *frame;
-    struct target_rt_frame_record *fr;
-    abi_ulong frame_addr, return_addr;
-
-    /* FPSIMD record is always in the standard space.  */
-    fpsimd_ofs = alloc_sigframe_space(sizeof(struct target_fpsimd_context),
-                                      &layout);
-
-    /* SVE state needs saving only if it exists.  */
-    if (arm_feature(env, ARM_FEATURE_SVE)) {
-        vq = (env->vfp.zcr_el[1] & 0xf) + 1;
-        sve_size = QEMU_ALIGN_UP(TARGET_SVE_SIG_CONTEXT_SIZE(vq), 16);
-        sve_ofs = alloc_sigframe_space(sve_size, &layout);
-    }
-
-    if (layout.extra_ofs) {
-        /* Reserve space for the extra end marker.  The standard end marker
-         * will have been allocated when we allocated the extra record.
-         */
-        layout.extra_end_ofs
-            = alloc_sigframe_space(sizeof(struct target_aarch64_ctx), &layout);
-    } else {
-        /* Reserve space for the standard end marker.
-         * Do not use alloc_sigframe_space because we cheat
-         * std_size therein to reserve space for this.
-         */
-        layout.std_end_ofs = layout.total_size;
-        layout.total_size += sizeof(struct target_aarch64_ctx);
-    }
-
-    /* We must always provide at least the standard 4K reserved space,
-     * even if we don't use all of it (this is part of the ABI)
-     */
-    layout.total_size = MAX(layout.total_size,
-                            sizeof(struct target_rt_sigframe));
-
-    /* Reserve space for the return code.  On a real system this would
-     * be within the VDSO.  So, despite the name this is not a "real"
-     * record within the frame.
-     */
-    fr_ofs = layout.total_size;
-    layout.total_size += sizeof(struct target_rt_frame_record);
-
-    frame_addr = get_sigframe(ka, env, layout.total_size);
-    trace_user_setup_frame(env, frame_addr);
-    frame = lock_user(VERIFY_WRITE, frame_addr, layout.total_size, 0);
-    if (!frame) {
-        goto give_sigsegv;
-    }
-
-    target_setup_general_frame(frame, env, set);
-    target_setup_fpsimd_record((void *)frame + fpsimd_ofs, env);
-    target_setup_end_record((void *)frame + layout.std_end_ofs);
-    if (layout.extra_ofs) {
-        target_setup_extra_record((void *)frame + layout.extra_ofs,
-                                  frame_addr + layout.extra_base,
-                                  layout.extra_size);
-        target_setup_end_record((void *)frame + layout.extra_end_ofs);
-    }
-    if (sve_ofs) {
-        target_setup_sve_record((void *)frame + sve_ofs, env, vq, sve_size);
-    }
-
-    /* Set up the stack frame for unwinding.  */
-    fr = (void *)frame + fr_ofs;
-    __put_user(env->xregs[29], &fr->fp);
-    __put_user(env->xregs[30], &fr->lr);
-
-    if (ka->sa_flags & TARGET_SA_RESTORER) {
-        return_addr = ka->sa_restorer;
-    } else {
-        /*
-         * mov x8,#__NR_rt_sigreturn; svc #0
-         * Since these are instructions they need to be put as little-endian
-         * regardless of target default or current CPU endianness.
-         */
-        __put_user_e(0xd2801168, &fr->tramp[0], le);
-        __put_user_e(0xd4000001, &fr->tramp[1], le);
-        return_addr = frame_addr + fr_ofs
-            + offsetof(struct target_rt_frame_record, tramp);
-    }
-    env->xregs[0] = usig;
-    env->xregs[31] = frame_addr;
-    env->xregs[29] = frame_addr + fr_ofs;
-    env->pc = ka->_sa_handler;
-    env->xregs[30] = return_addr;
-    if (info) {
-        tswap_siginfo(&frame->info, info);
-        env->xregs[1] = frame_addr + offsetof(struct target_rt_sigframe, info);
-        env->xregs[2] = frame_addr + offsetof(struct target_rt_sigframe, uc);
-    }
-
-    unlock_user(frame, frame_addr, layout.total_size);
-    return;
-
- give_sigsegv:
-    unlock_user(frame, frame_addr, layout.total_size);
-    force_sigsegv(usig);
-}
-
-static void setup_rt_frame(int sig, struct target_sigaction *ka,
-                           target_siginfo_t *info, target_sigset_t *set,
-                           CPUARMState *env)
-{
-    target_setup_frame(sig, ka, info, set, env);
-}
-
-static void setup_frame(int sig, struct target_sigaction *ka,
-                        target_sigset_t *set, CPUARMState *env)
-{
-    target_setup_frame(sig, ka, 0, set, env);
-}
-
-long do_rt_sigreturn(CPUARMState *env)
-{
-    struct target_rt_sigframe *frame = NULL;
-    abi_ulong frame_addr = env->xregs[31];
-
-    trace_user_do_rt_sigreturn(env, frame_addr);
-    if (frame_addr & 15) {
-        goto badframe;
-    }
-
-    if  (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
-        goto badframe;
-    }
-
-    if (target_restore_sigframe(env, frame)) {
-        goto badframe;
-    }
-
-    if (do_sigaltstack(frame_addr +
-            offsetof(struct target_rt_sigframe, uc.tuc_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 -TARGET_QEMU_ESIGRETURN;
-}
-
-long do_sigreturn(CPUARMState *env)
-{
-    return do_rt_sigreturn(env);
-}
-
-#elif defined(TARGET_ARM)
+#elif defined(TARGET_ARM) && !defined(TARGET_AARCH64)
 
 struct target_sigcontext {
     abi_ulong trap_no;