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    Subject[patch] thread-aware coredumps part 1, tcore-2.5.41-A6

    Linus,

    the attached patch is the initial (and most important) step to get
    quality, thread-aware coredumps. The patch is a cleaned up and simplified
    version of Vamsi Krishna's and Mark Gross' 2.4 tcore patch, ported to
    2.5.41.

    The patch does the following two things:

    - it writes out per-thread thread status notes, which debuggers then can
    use to figure out the per-thread state at the point of crash.

    - extends the ELF coredumping with extended FPU registers, and fills out
    the NT_PRXFPREG note with SSE state on x86.

    the patch also cleans up many aspects of ELF coredumping. The xfpu stuff
    (#ifdefs) is not particularly pretty, but is there a better way to do it?

    the next and final patch will be to 'freeze in' thread state upon
    coredumping - that patch obviously relies on this patch, but the current
    patch makes sense even without the 'state freezing' logic, so i believe we
    should consider it independently.

    Ingo

    --- linux/arch/i386/kernel/i387.c.orig 2002-09-20 17:20:37.000000000 +0200
    +++ linux/arch/i386/kernel/i387.c 2002-10-08 13:25:14.000000000 +0200
    @@ -528,3 +528,40 @@

    return fpvalid;
    }
    +
    +int dump_task_fpu(struct task_struct *tsk, struct user_i387_struct *fpu)
    +{
    + int fpvalid = tsk->used_math;
    +
    + if (fpvalid) {
    + if (tsk == current)
    + unlazy_fpu(tsk);
    + if (cpu_has_fxsr)
    + copy_fpu_fxsave(tsk, fpu);
    + else
    + copy_fpu_fsave(tsk, fpu);
    + }
    + return fpvalid;
    +}
    +
    +int dump_task_extended_fpu(struct task_struct *tsk, struct user_fxsr_struct *fpu)
    +{
    + int fpvalid = tsk->used_math && cpu_has_fxsr;
    +
    + if (fpvalid) {
    + if (tsk == current)
    + unlazy_fpu(tsk);
    + memcpy(fpu, &tsk->thread.i387.fxsave, sizeof(*fpu));
    + }
    + return fpvalid;
    +}
    +
    +
    +#ifdef CONFIG_SMP
    +void dump_smp_unlazy_fpu(void)
    +{
    + unlazy_fpu(current);
    + return;
    +}
    +#endif
    +
    --- linux/arch/i386/kernel/process.c.orig 2002-10-08 10:18:45.000000000 +0200
    +++ linux/arch/i386/kernel/process.c 2002-10-08 13:27:49.000000000 +0200
    @@ -19,6 +19,7 @@
    #include <linux/fs.h>
    #include <linux/kernel.h>
    #include <linux/mm.h>
    +#include <linux/elfcore.h>
    #include <linux/smp.h>
    #include <linux/smp_lock.h>
    #include <linux/stddef.h>
    @@ -373,6 +374,25 @@
    dump->u_fpvalid = dump_fpu (regs, &dump->i387);
    }

    +/*
    + * Capture the user space registers if the task is not running (in user space)
    + */
    +int dump_task_regs(struct task_struct *tsk, elf_gregset_t *regs)
    +{
    + struct pt_regs ptregs;
    +
    + ptregs = *(struct pt_regs *)
    + ((unsigned long)tsk + THREAD_SIZE - sizeof(ptregs));
    + ptregs.xcs &= 0xffff;
    + ptregs.xds &= 0xffff;
    + ptregs.xes &= 0xffff;
    + ptregs.xss &= 0xffff;
    +
    + elf_core_copy_regs(regs, &ptregs);
    +
    + return 1;
    +}
    +
    /*
    * This special macro can be used to load a debugging register
    */
    --- linux/fs/binfmt_elf.c.orig 2002-09-20 17:20:25.000000000 +0200
    +++ linux/fs/binfmt_elf.c 2002-10-08 13:35:18.000000000 +0200
    @@ -30,6 +30,7 @@
    #include <linux/elfcore.h>
    #include <linux/init.h>
    #include <linux/highuid.h>
    +#include <linux/smp.h>
    #include <linux/smp_lock.h>
    #include <linux/compiler.h>
    #include <linux/highmem.h>
    @@ -970,7 +971,7 @@
    /* #define DEBUG */

    #ifdef DEBUG
    -static void dump_regs(const char *str, elf_greg_t *r)
    +static void dump_regs(const char *str, elf_gregset_t *r)
    {
    int i;
    static const char *regs[] = { "ebx", "ecx", "edx", "esi", "edi", "ebp",
    @@ -1018,6 +1019,149 @@
    #define DUMP_SEEK(off) \
    if (!dump_seek(file, (off))) \
    goto end_coredump;
    +
    +static inline void fill_elf_header(struct elfhdr *elf, int segs)
    +{
    + memcpy(elf->e_ident, ELFMAG, SELFMAG);
    + elf->e_ident[EI_CLASS] = ELF_CLASS;
    + elf->e_ident[EI_DATA] = ELF_DATA;
    + elf->e_ident[EI_VERSION] = EV_CURRENT;
    + memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD);
    +
    + elf->e_type = ET_CORE;
    + elf->e_machine = ELF_ARCH;
    + elf->e_version = EV_CURRENT;
    + elf->e_entry = 0;
    + elf->e_phoff = sizeof(struct elfhdr);
    + elf->e_shoff = 0;
    + elf->e_flags = 0;
    + elf->e_ehsize = sizeof(struct elfhdr);
    + elf->e_phentsize = sizeof(struct elf_phdr);
    + elf->e_phnum = segs;
    + elf->e_shentsize = 0;
    + elf->e_shnum = 0;
    + elf->e_shstrndx = 0;
    + return;
    +}
    +
    +static inline void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, off_t offset)
    +{
    + phdr->p_type = PT_NOTE;
    + phdr->p_offset = offset;
    + phdr->p_vaddr = 0;
    + phdr->p_paddr = 0;
    + phdr->p_filesz = sz;
    + phdr->p_memsz = 0;
    + phdr->p_flags = 0;
    + phdr->p_align = 0;
    + return;
    +}
    +
    +static inline void fill_note(struct memelfnote *note, const char *name, int type,
    + unsigned int sz, void *data)
    +{
    + note->name = name;
    + note->type = type;
    + note->datasz = sz;
    + note->data = data;
    + return;
    +}
    +
    +/*
    + * fill up all the fields in prstatus from the given task struct, except registers
    + * which need to be filled up seperately.
    + */
    +static inline void fill_prstatus(struct elf_prstatus *prstatus, struct task_struct *p, long signr)
    +{
    + prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;
    + prstatus->pr_sigpend = p->pending.signal.sig[0];
    + prstatus->pr_sighold = p->blocked.sig[0];
    + prstatus->pr_pid = p->pid;
    + prstatus->pr_ppid = p->parent->pid;
    + prstatus->pr_pgrp = p->pgrp;
    + prstatus->pr_sid = p->session;
    + jiffies_to_timeval(p->utime, &prstatus->pr_utime);
    + jiffies_to_timeval(p->stime, &prstatus->pr_stime);
    + jiffies_to_timeval(p->cutime, &prstatus->pr_cutime);
    + jiffies_to_timeval(p->cstime, &prstatus->pr_cstime);
    +}
    +
    +static inline void fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p)
    +{
    + int i;
    +
    + psinfo->pr_pid = p->pid;
    + psinfo->pr_ppid = p->parent->pid;
    + psinfo->pr_pgrp = p->pgrp;
    + psinfo->pr_sid = p->session;
    +
    + i = p->state ? ffz(~p->state) + 1 : 0;
    + psinfo->pr_state = i;
    + psinfo->pr_sname = (i < 0 || i > 5) ? '.' : "RSDZTD"[i];
    + psinfo->pr_zomb = psinfo->pr_sname == 'Z';
    + psinfo->pr_nice = task_nice(p);
    + psinfo->pr_flag = p->flags;
    + psinfo->pr_uid = NEW_TO_OLD_UID(p->uid);
    + psinfo->pr_gid = NEW_TO_OLD_GID(p->gid);
    + strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname));
    + return;
    +}
    +
    +/* Here is the structure in which status of each thread is captured. */
    +struct elf_thread_status
    +{
    + struct list_head list;
    + struct elf_prstatus prstatus; /* NT_PRSTATUS */
    + elf_fpregset_t fpu; /* NT_PRFPREG */
    +#ifdef ELF_CORE_COPY_XFPREGS
    + elf_fpxregset_t xfpu; /* NT_PRXFPREG */
    +#endif
    + struct memelfnote notes[3];
    + int num_notes;
    +};
    +
    +/*
    + * In order to add the specific thread information for the elf file format,
    + * we need to keep a linked list of every threads pr_status and then
    + * create a single section for them in the final core file.
    + */
    +static int elf_dump_thread_status(long signr, struct task_struct * p, struct list_head * thread_list)
    +{
    +
    + struct elf_thread_status *t;
    + int sz = 0;
    +
    + t = kmalloc(sizeof(*t), GFP_ATOMIC);
    + if (!t)
    + return 0;
    +
    + INIT_LIST_HEAD(&t->list);
    + t->num_notes = 0;
    +
    + fill_prstatus(&t->prstatus, p, signr);
    + elf_core_copy_task_regs(p, &t->prstatus.pr_reg);
    +
    + fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus), &(t->prstatus));
    + t->num_notes++;
    + sz += notesize(&t->notes[0]);
    +
    + if ((t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, &t->fpu))) {
    + fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu), &(t->fpu));
    + t->num_notes++;
    + sz += notesize(&t->notes[1]);
    + }
    +
    +#ifdef ELF_CORE_COPY_XFPREGS
    + if (elf_core_copy_task_xfpregs(p, &t->xfpu)) {
    + fill_note(&t->notes[2], "LINUX", NT_PRXFPREG, sizeof(t->xfpu), &t->xfpu);
    + t->num_notes++;
    + sz += notesize(&t->notes[2]);
    + }
    +#endif
    + list_add(&t->list, thread_list);
    + return sz;
    +}
    +
    /*
    * Actual dumper
    *
    @@ -1036,12 +1180,19 @@
    struct elfhdr elf;
    off_t offset = 0, dataoff;
    unsigned long limit = current->rlim[RLIMIT_CORE].rlim_cur;
    - int numnote = 4;
    - struct memelfnote notes[4];
    + int numnote = 5;
    + struct memelfnote notes[5];
    struct elf_prstatus prstatus; /* NT_PRSTATUS */
    - elf_fpregset_t fpu; /* NT_PRFPREG */
    struct elf_prpsinfo psinfo; /* NT_PRPSINFO */
    -
    + struct task_struct *g, *p;
    + LIST_HEAD(thread_list);
    + struct list_head *t;
    + elf_fpregset_t fpu;
    +#ifdef ELF_CORE_COPY_XFPREGS
    + elf_fpxregset_t xfpu;
    +#endif
    + int thread_status_size = 0;
    +
    /* first copy the parameters from user space */
    memset(&psinfo, 0, sizeof(psinfo));
    {
    @@ -1076,34 +1227,49 @@
    *(struct pt_regs *)&prstatus.pr_reg = *regs;
    #endif

    - /* now stop all vm operations */
    - down_write(&current->mm->mmap_sem);
    - segs = current->mm->map_count;
    + /* capture the status of all other threads */
    + if (signr) {
    + read_lock(&tasklist_lock);
    + do_each_thread(g,p)
    + if (current->mm == p->mm && current != p) {
    + int sz = elf_dump_thread_status(signr, p, &thread_list);
    + if (!sz) {
    + read_unlock(&tasklist_lock);
    + goto cleanup;
    + } else
    + thread_status_size += sz;
    + }
    + while_each_thread(g,p);
    + read_unlock(&tasklist_lock);
    + }
    +
    + memset(&prstatus, 0, sizeof(prstatus));
    + fill_prstatus(&prstatus, current, signr);
    + elf_core_copy_regs(&prstatus.pr_reg, regs);
    +
    + /* We no longer stop all vm operations */
    +
    + /* This because those proceses that could possibly
    + * change map_count or the mmap / vma pages are now suspended.
    + *
    + * Only ptrace can touch these memory address, but it cannot change
    + * the map_count or the pages. So no possibility of crashing exists while dumping
    + * the mm->vm_next areas to the core file.
    + *
    + * Grabbing mmap_sem in this function is risky WRT the use of suspend_threads.
    + * Although no locks ups have been induced, if one of the suspended threads was
    + * in line for the current->mmap_sem and if gets it while on the Phantom runque,
    + * then we would dead lock in this function if we continue to attempt to down_write
    + * in this function.
    + */
    + segs = current->mm->map_count;

    #ifdef DEBUG
    printk("elf_core_dump: %d segs %lu limit\n", segs, limit);
    #endif

    /* Set up header */
    - memcpy(elf.e_ident, ELFMAG, SELFMAG);
    - elf.e_ident[EI_CLASS] = ELF_CLASS;
    - elf.e_ident[EI_DATA] = ELF_DATA;
    - elf.e_ident[EI_VERSION] = EV_CURRENT;
    - memset(elf.e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD);
    -
    - elf.e_type = ET_CORE;
    - elf.e_machine = ELF_ARCH;
    - elf.e_version = EV_CURRENT;
    - elf.e_entry = 0;
    - elf.e_phoff = sizeof(elf);
    - elf.e_shoff = 0;
    - elf.e_flags = 0;
    - elf.e_ehsize = sizeof(elf);
    - elf.e_phentsize = sizeof(struct elf_phdr);
    - elf.e_phnum = segs+1; /* Include notes */
    - elf.e_shentsize = 0;
    - elf.e_shnum = 0;
    - elf.e_shstrndx = 0;
    + fill_elf_header(&elf, segs+1); /* including notes section*/

    fs = get_fs();
    set_fs(KERNEL_DS);
    @@ -1120,60 +1286,29 @@
    * with info from their /proc.
    */

    - notes[0].name = "CORE";
    - notes[0].type = NT_PRSTATUS;
    - notes[0].datasz = sizeof(prstatus);
    - notes[0].data = &prstatus;
    - prstatus.pr_info.si_signo = prstatus.pr_cursig = signr;
    - prstatus.pr_sigpend = current->pending.signal.sig[0];
    - prstatus.pr_sighold = current->blocked.sig[0];
    - psinfo.pr_pid = prstatus.pr_pid = current->pid;
    - psinfo.pr_ppid = prstatus.pr_ppid = current->parent->pid;
    - psinfo.pr_pgrp = prstatus.pr_pgrp = current->pgrp;
    - psinfo.pr_sid = prstatus.pr_sid = current->session;
    - jiffies_to_timeval(current->utime, &prstatus.pr_utime);
    - jiffies_to_timeval(current->stime, &prstatus.pr_stime);
    - jiffies_to_timeval(current->cutime, &prstatus.pr_cutime);
    - jiffies_to_timeval(current->cstime, &prstatus.pr_cstime);
    -
    -#ifdef DEBUG
    - dump_regs("Passed in regs", (elf_greg_t *)regs);
    - dump_regs("prstatus regs", (elf_greg_t *)&prstatus.pr_reg);
    -#endif
    -
    - notes[1].name = "CORE";
    - notes[1].type = NT_PRPSINFO;
    - notes[1].datasz = sizeof(psinfo);
    - notes[1].data = &psinfo;
    - i = current->state ? ffz(~current->state) + 1 : 0;
    - psinfo.pr_state = i;
    - psinfo.pr_sname = (i < 0 || i > 5) ? '.' : "RSDZTD"[i];
    - psinfo.pr_zomb = psinfo.pr_sname == 'Z';
    - psinfo.pr_nice = task_nice(current);
    - psinfo.pr_flag = current->flags;
    - psinfo.pr_uid = NEW_TO_OLD_UID(current->uid);
    - psinfo.pr_gid = NEW_TO_OLD_GID(current->gid);
    - strncpy(psinfo.pr_fname, current->comm, sizeof(psinfo.pr_fname));
    -
    - notes[2].name = "CORE";
    - notes[2].type = NT_TASKSTRUCT;
    - notes[2].datasz = sizeof(*current);
    - notes[2].data = current;
    -
    - /* Try to dump the FPU. */
    - prstatus.pr_fpvalid = dump_fpu (regs, &fpu);
    - if (!prstatus.pr_fpvalid)
    - {
    - numnote--;
    - }
    - else
    - {
    - notes[3].name = "CORE";
    - notes[3].type = NT_PRFPREG;
    - notes[3].datasz = sizeof(fpu);
    - notes[3].data = &fpu;
    - }
    + fill_note(&notes[0], "CORE", NT_PRSTATUS, sizeof(prstatus), &prstatus);

    + fill_psinfo(&psinfo, current);
    + fill_note(&notes[1], "CORE", NT_PRPSINFO, sizeof(psinfo), &psinfo);
    +
    + fill_note(&notes[2], "CORE", NT_TASKSTRUCT, sizeof(*current), current);
    +
    + /* Try to dump the FPU. */
    + if ((prstatus.pr_fpvalid = elf_core_copy_task_fpregs(current, &fpu))) {
    + fill_note(&notes[3], "CORE", NT_PRFPREG, sizeof(fpu), &fpu);
    + } else {
    + --numnote;
    + }
    +#ifdef ELF_CORE_COPY_XFPREGS
    + if (elf_core_copy_task_xfpregs(current, &xfpu)) {
    + fill_note(&notes[4], "LINUX", NT_PRXFPREG, sizeof(xfpu), &xfpu);
    + } else {
    + --numnote;
    + }
    +#else
    + numnote --;
    +#endif
    +
    /* Write notes phdr entry */
    {
    struct elf_phdr phdr;
    @@ -1181,17 +1316,11 @@

    for(i = 0; i < numnote; i++)
    sz += notesize(&notes[i]);
    +
    + sz += thread_status_size;

    - phdr.p_type = PT_NOTE;
    - phdr.p_offset = offset;
    - phdr.p_vaddr = 0;
    - phdr.p_paddr = 0;
    - phdr.p_filesz = sz;
    - phdr.p_memsz = 0;
    - phdr.p_flags = 0;
    - phdr.p_align = 0;
    -
    - offset += phdr.p_filesz;
    + fill_elf_note_phdr(&phdr, sz, offset);
    + offset += sz;
    DUMP_WRITE(&phdr, sizeof(phdr));
    }

    @@ -1220,10 +1349,19 @@
    DUMP_WRITE(&phdr, sizeof(phdr));
    }

    + /* write out the notes section */
    for(i = 0; i < numnote; i++)
    if (!writenote(&notes[i], file))
    goto end_coredump;

    + /* write out the thread status notes section */
    + list_for_each(t, &thread_list) {
    + struct elf_thread_status *tmp = list_entry(t, struct elf_thread_status, list);
    + for (i = 0; i < tmp->num_notes; i++)
    + if (!writenote(&tmp->notes[i], file))
    + goto end_coredump;
    + }
    +
    DUMP_SEEK(dataoff);

    for(vma = current->mm->mmap; vma != NULL; vma = vma->vm_next) {
    @@ -1267,11 +1405,19 @@
    (off_t) file->f_pos, offset);
    }

    - end_coredump:
    +end_coredump:
    set_fs(fs);
    - up_write(&current->mm->mmap_sem);
    +
    +cleanup:
    + while(!list_empty(&thread_list)) {
    + struct list_head *tmp = thread_list.next;
    + list_del(tmp);
    + kfree(list_entry(tmp, struct elf_thread_status, list));
    + }
    +
    return has_dumped;
    }
    +
    #endif /* USE_ELF_CORE_DUMP */

    static int __init init_elf_binfmt(void)
    --- linux/include/linux/elfcore.h.orig 2002-09-20 17:20:25.000000000 +0200
    +++ linux/include/linux/elfcore.h 2002-10-08 13:31:29.000000000 +0200
    @@ -85,4 +85,45 @@
    #define PRARGSZ ELF_PRARGSZ
    #endif

    +#ifdef __KERNEL__
    +static inline void elf_core_copy_regs(elf_gregset_t *elfregs, struct pt_regs *regs)
    +{
    +#ifdef ELF_CORE_COPY_REGS
    + ELF_CORE_COPY_REGS((*elfregs), regs)
    +#else
    + BUG_ON(sizeof(*elfregs) != sizeof(*regs));
    + *(struct pt_regs *)elfregs = *regs;
    +#endif
    +}
    +
    +static inline int elf_core_copy_task_regs(struct task_struct *t, elf_gregset_t* elfregs)
    +{
    +#ifdef ELF_CORE_COPY_TASK_REGS
    +
    + return ELF_CORE_COPY_TASK_REGS(t, elfregs);
    +#endif
    + return 0;
    +}
    +
    +extern int dump_fpu (struct pt_regs *, elf_fpregset_t *);
    +
    +static inline int elf_core_copy_task_fpregs(struct task_struct *t, elf_fpregset_t *fpu)
    +{
    +#ifdef ELF_CORE_COPY_FPREGS
    + return ELF_CORE_COPY_FPREGS(t, fpu);
    +#else
    + return dump_fpu(NULL, fpu);
    +#endif
    +}
    +
    +#ifdef ELF_CORE_COPY_XFPREGS
    +static inline int elf_core_copy_task_xfpregs(struct task_struct *t, elf_fpxregset_t *xfpu)
    +{
    + return ELF_CORE_COPY_XFPREGS(t, xfpu);
    +}
    +#endif
    +
    +#endif /* __KERNEL__ */
    +
    +
    #endif /* _LINUX_ELFCORE_H */
    --- linux/include/linux/elf.h.orig 2002-10-08 10:18:45.000000000 +0200
    +++ linux/include/linux/elf.h 2002-10-08 13:08:47.000000000 +0200
    @@ -1,6 +1,7 @@
    #ifndef _LINUX_ELF_H
    #define _LINUX_ELF_H

    +#include <linux/sched.h>
    #include <linux/types.h>
    #include <asm/elf.h>

    @@ -575,7 +576,8 @@
    #define NT_PRFPREG 2
    #define NT_PRPSINFO 3
    #define NT_TASKSTRUCT 4
    -#define NT_PRFPXREG 20
    +#define NT_PRXFPREG 0x46e62b7f /* copied from gdb5.1/include/elf/common.h */
    +

    /* Note header in a PT_NOTE section */
    typedef struct elf32_note {
    --- linux/include/asm-i386/elf.h.orig 2002-09-20 17:20:31.000000000 +0200
    +++ linux/include/asm-i386/elf.h 2002-10-08 13:08:47.000000000 +0200
    @@ -7,6 +7,7 @@

    #include <asm/ptrace.h>
    #include <asm/user.h>
    +#include <asm/processor.h>

    #include <linux/utsname.h>

    @@ -59,6 +60,9 @@

    /* Wow, the "main" arch needs arch dependent functions too.. :) */

    +#define savesegment(seg,value) \
    + asm volatile("movl %%" #seg ",%0":"=m" (*(int *)&(value)))
    +
    /* regs is struct pt_regs, pr_reg is elf_gregset_t (which is
    now struct_user_regs, they are different) */

    @@ -72,9 +76,8 @@
    pr_reg[6] = regs->eax; \
    pr_reg[7] = regs->xds; \
    pr_reg[8] = regs->xes; \
    - /* fake once used fs and gs selectors? */ \
    - pr_reg[9] = regs->xds; /* was fs and __fs */ \
    - pr_reg[10] = regs->xds; /* was gs and __gs */ \
    + savesegment(fs,pr_reg[9]); \
    + savesegment(gs,pr_reg[10]); \
    pr_reg[11] = regs->orig_eax; \
    pr_reg[12] = regs->eip; \
    pr_reg[13] = regs->xcs; \
    @@ -99,6 +102,20 @@

    #ifdef __KERNEL__
    #define SET_PERSONALITY(ex, ibcs2) set_personality((ibcs2)?PER_SVR4:PER_LINUX)
    +
    +extern int dump_task_regs (struct task_struct *, elf_gregset_t *);
    +extern int dump_task_fpu (struct task_struct *, elf_fpregset_t *);
    +extern int dump_task_extended_fpu (struct task_struct *, struct user_fxsr_struct *);
    +
    +#define ELF_CORE_COPY_TASK_REGS(tsk, elf_regs) dump_task_regs(tsk, elf_regs)
    +#define ELF_CORE_COPY_FPREGS(tsk, elf_fpregs) dump_task_fpu(tsk, elf_fpregs)
    +#define ELF_CORE_COPY_XFPREGS(tsk, elf_xfpregs) dump_task_extended_fpu(tsk, elf_xfpregs)
    +
    +#ifdef CONFIG_SMP
    +extern void dump_smp_unlazy_fpu(void);
    +#define ELF_CORE_SYNC dump_smp_unlazy_fpu
    +#endif
    +
    #endif

    #endif
    -
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