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sparc: Fix VDSO build with older binutils.
Older versions of bintutils do not allow symbol math across different
segments on sparc:
====================
Assembler messages:
99: Error: operation combines symbols in different segments
====================
This is controlled by whether or not DIFF_EXPR_OK is defined in
gas/config/tc-*.h and for sparc this was not the case until mid-2017.
So we have to patch between %stick and %tick another way.
Do what powerpc does and emit two versions of the relevant functions,
one using %tick and one using %stick, and patch the symbols in the
dynamic symbol table.
Fixes: 2f6c9bf31a ("sparc: Improve VDSO instruction patching.")
Reported-by: Meelis Roos <mroos@linux.ee>
Tested-by: Meelis Roos <mroos@linux.ee>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
parent
44adbac8f7
commit
caf539cd10
@ -9,8 +9,6 @@ struct vdso_image {
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void *data;
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unsigned long size; /* Always a multiple of PAGE_SIZE */
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unsigned long tick_patch, tick_patch_len;
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long sym_vvar_start; /* Negative offset to the vvar area */
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};
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@ -90,16 +90,15 @@ notrace static __always_inline u64 vread_tick(void)
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{
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u64 ret;
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__asm__ __volatile__("1:\n\t"
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"rd %%tick, %0\n\t"
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".pushsection .tick_patch, \"a\"\n\t"
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".word 1b - ., 1f - .\n\t"
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".popsection\n\t"
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".pushsection .tick_patch_replacement, \"ax\"\n\t"
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"1:\n\t"
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"rd %%asr24, %0\n\t"
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".popsection\n"
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: "=r" (ret));
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__asm__ __volatile__("rd %%tick, %0" : "=r" (ret));
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return ret;
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}
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notrace static __always_inline u64 vread_tick_stick(void)
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{
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u64 ret;
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__asm__ __volatile__("rd %%asr24, %0" : "=r" (ret));
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return ret;
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}
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#else
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@ -107,16 +106,18 @@ notrace static __always_inline u64 vread_tick(void)
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{
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register unsigned long long ret asm("o4");
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__asm__ __volatile__("1:\n\t"
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"rd %%tick, %L0\n\t"
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"srlx %L0, 32, %H0\n\t"
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".pushsection .tick_patch, \"a\"\n\t"
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".word 1b - ., 1f - .\n\t"
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".popsection\n\t"
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".pushsection .tick_patch_replacement, \"ax\"\n\t"
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"1:\n\t"
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"rd %%asr24, %L0\n\t"
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".popsection\n"
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__asm__ __volatile__("rd %%tick, %L0\n\t"
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"srlx %L0, 32, %H0"
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: "=r" (ret));
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return ret;
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}
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notrace static __always_inline u64 vread_tick_stick(void)
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{
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register unsigned long long ret asm("o4");
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__asm__ __volatile__("rd %%asr24, %L0\n\t"
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"srlx %L0, 32, %H0"
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: "=r" (ret));
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return ret;
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}
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@ -132,6 +133,16 @@ notrace static __always_inline u64 vgetsns(struct vvar_data *vvar)
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return v * vvar->clock.mult;
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}
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notrace static __always_inline u64 vgetsns_stick(struct vvar_data *vvar)
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{
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u64 v;
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u64 cycles;
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cycles = vread_tick_stick();
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v = (cycles - vvar->clock.cycle_last) & vvar->clock.mask;
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return v * vvar->clock.mult;
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}
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notrace static __always_inline int do_realtime(struct vvar_data *vvar,
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struct timespec *ts)
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{
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@ -152,6 +163,26 @@ notrace static __always_inline int do_realtime(struct vvar_data *vvar,
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return 0;
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}
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notrace static __always_inline int do_realtime_stick(struct vvar_data *vvar,
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struct timespec *ts)
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{
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unsigned long seq;
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u64 ns;
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do {
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seq = vvar_read_begin(vvar);
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ts->tv_sec = vvar->wall_time_sec;
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ns = vvar->wall_time_snsec;
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ns += vgetsns_stick(vvar);
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ns >>= vvar->clock.shift;
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} while (unlikely(vvar_read_retry(vvar, seq)));
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ts->tv_sec += __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns);
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ts->tv_nsec = ns;
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return 0;
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}
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notrace static __always_inline int do_monotonic(struct vvar_data *vvar,
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struct timespec *ts)
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{
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@ -172,6 +203,26 @@ notrace static __always_inline int do_monotonic(struct vvar_data *vvar,
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return 0;
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}
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notrace static __always_inline int do_monotonic_stick(struct vvar_data *vvar,
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struct timespec *ts)
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{
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unsigned long seq;
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u64 ns;
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do {
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seq = vvar_read_begin(vvar);
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ts->tv_sec = vvar->monotonic_time_sec;
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ns = vvar->monotonic_time_snsec;
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ns += vgetsns_stick(vvar);
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ns >>= vvar->clock.shift;
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} while (unlikely(vvar_read_retry(vvar, seq)));
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ts->tv_sec += __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns);
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ts->tv_nsec = ns;
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return 0;
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}
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notrace static int do_realtime_coarse(struct vvar_data *vvar,
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struct timespec *ts)
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{
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@ -227,6 +278,31 @@ int
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clock_gettime(clockid_t, struct timespec *)
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__attribute__((weak, alias("__vdso_clock_gettime")));
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notrace int
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__vdso_clock_gettime_stick(clockid_t clock, struct timespec *ts)
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{
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struct vvar_data *vvd = get_vvar_data();
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switch (clock) {
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case CLOCK_REALTIME:
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if (unlikely(vvd->vclock_mode == VCLOCK_NONE))
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break;
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return do_realtime_stick(vvd, ts);
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case CLOCK_MONOTONIC:
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if (unlikely(vvd->vclock_mode == VCLOCK_NONE))
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break;
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return do_monotonic_stick(vvd, ts);
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case CLOCK_REALTIME_COARSE:
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return do_realtime_coarse(vvd, ts);
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case CLOCK_MONOTONIC_COARSE:
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return do_monotonic_coarse(vvd, ts);
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}
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/*
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* Unknown clock ID ? Fall back to the syscall.
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*/
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return vdso_fallback_gettime(clock, ts);
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}
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notrace int
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__vdso_gettimeofday(struct timeval *tv, struct timezone *tz)
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{
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@ -262,3 +338,36 @@ __vdso_gettimeofday(struct timeval *tv, struct timezone *tz)
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int
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gettimeofday(struct timeval *, struct timezone *)
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__attribute__((weak, alias("__vdso_gettimeofday")));
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notrace int
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__vdso_gettimeofday_stick(struct timeval *tv, struct timezone *tz)
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{
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struct vvar_data *vvd = get_vvar_data();
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if (likely(vvd->vclock_mode != VCLOCK_NONE)) {
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if (likely(tv != NULL)) {
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union tstv_t {
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struct timespec ts;
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struct timeval tv;
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} *tstv = (union tstv_t *) tv;
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do_realtime_stick(vvd, &tstv->ts);
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/*
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* Assign before dividing to ensure that the division is
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* done in the type of tv_usec, not tv_nsec.
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*
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* There cannot be > 1 billion usec in a second:
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* do_realtime() has already distributed such overflow
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* into tv_sec. So we can assign it to an int safely.
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*/
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tstv->tv.tv_usec = tstv->ts.tv_nsec;
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tstv->tv.tv_usec /= 1000;
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}
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if (unlikely(tz != NULL)) {
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/* Avoid memcpy. Some old compilers fail to inline it */
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tz->tz_minuteswest = vvd->tz_minuteswest;
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tz->tz_dsttime = vvd->tz_dsttime;
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}
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return 0;
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}
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return vdso_fallback_gettimeofday(tv, tz);
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}
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@ -73,9 +73,6 @@ SECTIONS
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.text : { *(.text*) } :text =0x90909090,
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.tick_patch : { *(.tick_patch) } :text
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.tick_patch_insns : { *(.tick_patch_insns) } :text
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/DISCARD/ : {
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*(.discard)
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*(.discard.*)
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@ -18,8 +18,10 @@ VERSION {
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global:
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clock_gettime;
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__vdso_clock_gettime;
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__vdso_clock_gettime_stick;
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gettimeofday;
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__vdso_gettimeofday;
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__vdso_gettimeofday_stick;
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local: *;
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};
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}
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@ -17,11 +17,9 @@ static void BITSFUNC(go)(void *raw_addr, size_t raw_len,
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unsigned long mapping_size;
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int i;
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unsigned long j;
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ELF(Shdr) *symtab_hdr = NULL, *strtab_hdr, *secstrings_hdr,
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*patch_sec = NULL;
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ELF(Shdr) *symtab_hdr = NULL, *strtab_hdr;
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ELF(Ehdr) *hdr = (ELF(Ehdr) *)raw_addr;
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ELF(Dyn) *dyn = 0, *dyn_end = 0;
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const char *secstrings;
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INT_BITS syms[NSYMS] = {};
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ELF(Phdr) *pt = (ELF(Phdr) *)(raw_addr + GET_BE(&hdr->e_phoff));
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@ -64,18 +62,11 @@ static void BITSFUNC(go)(void *raw_addr, size_t raw_len,
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}
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/* Walk the section table */
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secstrings_hdr = raw_addr + GET_BE(&hdr->e_shoff) +
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GET_BE(&hdr->e_shentsize)*GET_BE(&hdr->e_shstrndx);
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secstrings = raw_addr + GET_BE(&secstrings_hdr->sh_offset);
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for (i = 0; i < GET_BE(&hdr->e_shnum); i++) {
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ELF(Shdr) *sh = raw_addr + GET_BE(&hdr->e_shoff) +
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GET_BE(&hdr->e_shentsize) * i;
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if (GET_BE(&sh->sh_type) == SHT_SYMTAB)
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symtab_hdr = sh;
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if (!strcmp(secstrings + GET_BE(&sh->sh_name),
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".tick_patch"))
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patch_sec = sh;
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}
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if (!symtab_hdr)
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@ -142,12 +133,6 @@ static void BITSFUNC(go)(void *raw_addr, size_t raw_len,
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fprintf(outfile, "const struct vdso_image %s_builtin = {\n", name);
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fprintf(outfile, "\t.data = raw_data,\n");
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fprintf(outfile, "\t.size = %lu,\n", mapping_size);
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if (patch_sec) {
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fprintf(outfile, "\t.tick_patch = %lu,\n",
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(unsigned long)GET_BE(&patch_sec->sh_offset));
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fprintf(outfile, "\t.tick_patch_len = %lu,\n",
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(unsigned long)GET_BE(&patch_sec->sh_size));
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}
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for (i = 0; i < NSYMS; i++) {
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if (required_syms[i].export && syms[i])
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fprintf(outfile, "\t.sym_%s = %" PRIi64 ",\n",
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@ -17,8 +17,10 @@ VERSION {
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global:
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clock_gettime;
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__vdso_clock_gettime;
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__vdso_clock_gettime_stick;
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gettimeofday;
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__vdso_gettimeofday;
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__vdso_gettimeofday_stick;
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local: *;
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};
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}
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@ -42,24 +42,201 @@ static struct vm_special_mapping vdso_mapping32 = {
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struct vvar_data *vvar_data;
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struct tick_patch_entry {
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s32 orig, repl;
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struct vdso_elfinfo32 {
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Elf32_Ehdr *hdr;
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Elf32_Sym *dynsym;
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unsigned long dynsymsize;
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const char *dynstr;
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unsigned long text;
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};
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static void stick_patch(const struct vdso_image *image)
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struct vdso_elfinfo64 {
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Elf64_Ehdr *hdr;
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Elf64_Sym *dynsym;
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unsigned long dynsymsize;
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const char *dynstr;
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unsigned long text;
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};
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struct vdso_elfinfo {
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union {
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struct vdso_elfinfo32 elf32;
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struct vdso_elfinfo64 elf64;
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} u;
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};
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static void *one_section64(struct vdso_elfinfo64 *e, const char *name,
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unsigned long *size)
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{
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struct tick_patch_entry *p, *p_end;
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const char *snames;
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Elf64_Shdr *shdrs;
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unsigned int i;
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p = image->data + image->tick_patch;
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p_end = (void *)p + image->tick_patch_len;
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while (p < p_end) {
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u32 *instr = (void *)&p->orig + p->orig;
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u32 *repl = (void *)&p->repl + p->repl;
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*instr = *repl;
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flushi(instr);
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p++;
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shdrs = (void *)e->hdr + e->hdr->e_shoff;
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snames = (void *)e->hdr + shdrs[e->hdr->e_shstrndx].sh_offset;
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for (i = 1; i < e->hdr->e_shnum; i++) {
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if (!strcmp(snames+shdrs[i].sh_name, name)) {
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if (size)
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*size = shdrs[i].sh_size;
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return (void *)e->hdr + shdrs[i].sh_offset;
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}
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}
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return NULL;
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}
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static int find_sections64(const struct vdso_image *image, struct vdso_elfinfo *_e)
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{
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struct vdso_elfinfo64 *e = &_e->u.elf64;
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e->hdr = image->data;
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e->dynsym = one_section64(e, ".dynsym", &e->dynsymsize);
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e->dynstr = one_section64(e, ".dynstr", NULL);
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if (!e->dynsym || !e->dynstr) {
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pr_err("VDSO64: Missing symbol sections.\n");
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return -ENODEV;
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}
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return 0;
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}
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static Elf64_Sym *find_sym64(const struct vdso_elfinfo64 *e, const char *name)
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{
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unsigned int i;
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for (i = 0; i < (e->dynsymsize / sizeof(Elf64_Sym)); i++) {
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Elf64_Sym *s = &e->dynsym[i];
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if (s->st_name == 0)
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continue;
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if (!strcmp(e->dynstr + s->st_name, name))
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return s;
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}
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return NULL;
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}
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static int patchsym64(struct vdso_elfinfo *_e, const char *orig,
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const char *new)
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{
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struct vdso_elfinfo64 *e = &_e->u.elf64;
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Elf64_Sym *osym = find_sym64(e, orig);
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Elf64_Sym *nsym = find_sym64(e, new);
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if (!nsym || !osym) {
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pr_err("VDSO64: Missing symbols.\n");
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return -ENODEV;
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}
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osym->st_value = nsym->st_value;
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osym->st_size = nsym->st_size;
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osym->st_info = nsym->st_info;
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osym->st_other = nsym->st_other;
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osym->st_shndx = nsym->st_shndx;
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return 0;
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}
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static void *one_section32(struct vdso_elfinfo32 *e, const char *name,
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unsigned long *size)
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{
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const char *snames;
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Elf32_Shdr *shdrs;
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unsigned int i;
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shdrs = (void *)e->hdr + e->hdr->e_shoff;
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snames = (void *)e->hdr + shdrs[e->hdr->e_shstrndx].sh_offset;
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for (i = 1; i < e->hdr->e_shnum; i++) {
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if (!strcmp(snames+shdrs[i].sh_name, name)) {
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if (size)
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*size = shdrs[i].sh_size;
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return (void *)e->hdr + shdrs[i].sh_offset;
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}
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}
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return NULL;
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}
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static int find_sections32(const struct vdso_image *image, struct vdso_elfinfo *_e)
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{
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struct vdso_elfinfo32 *e = &_e->u.elf32;
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e->hdr = image->data;
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e->dynsym = one_section32(e, ".dynsym", &e->dynsymsize);
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e->dynstr = one_section32(e, ".dynstr", NULL);
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if (!e->dynsym || !e->dynstr) {
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pr_err("VDSO32: Missing symbol sections.\n");
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return -ENODEV;
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}
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return 0;
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}
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static Elf32_Sym *find_sym32(const struct vdso_elfinfo32 *e, const char *name)
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{
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unsigned int i;
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for (i = 0; i < (e->dynsymsize / sizeof(Elf32_Sym)); i++) {
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Elf32_Sym *s = &e->dynsym[i];
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if (s->st_name == 0)
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continue;
|
||||
if (!strcmp(e->dynstr + s->st_name, name))
|
||||
return s;
|
||||
}
|
||||
return NULL;
|
||||
}
|
||||
|
||||
static int patchsym32(struct vdso_elfinfo *_e, const char *orig,
|
||||
const char *new)
|
||||
{
|
||||
struct vdso_elfinfo32 *e = &_e->u.elf32;
|
||||
Elf32_Sym *osym = find_sym32(e, orig);
|
||||
Elf32_Sym *nsym = find_sym32(e, new);
|
||||
|
||||
if (!nsym || !osym) {
|
||||
pr_err("VDSO32: Missing symbols.\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
osym->st_value = nsym->st_value;
|
||||
osym->st_size = nsym->st_size;
|
||||
osym->st_info = nsym->st_info;
|
||||
osym->st_other = nsym->st_other;
|
||||
osym->st_shndx = nsym->st_shndx;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int find_sections(const struct vdso_image *image, struct vdso_elfinfo *e,
|
||||
bool elf64)
|
||||
{
|
||||
if (elf64)
|
||||
return find_sections64(image, e);
|
||||
else
|
||||
return find_sections32(image, e);
|
||||
}
|
||||
|
||||
static int patch_one_symbol(struct vdso_elfinfo *e, const char *orig,
|
||||
const char *new_target, bool elf64)
|
||||
{
|
||||
if (elf64)
|
||||
return patchsym64(e, orig, new_target);
|
||||
else
|
||||
return patchsym32(e, orig, new_target);
|
||||
}
|
||||
|
||||
static int stick_patch(const struct vdso_image *image, struct vdso_elfinfo *e, bool elf64)
|
||||
{
|
||||
int err;
|
||||
|
||||
err = find_sections(image, e, elf64);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
err = patch_one_symbol(e,
|
||||
"__vdso_gettimeofday",
|
||||
"__vdso_gettimeofday_stick", elf64);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
return patch_one_symbol(e,
|
||||
"__vdso_clock_gettime",
|
||||
"__vdso_clock_gettime_stick", elf64);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
@ -67,13 +244,19 @@ static void stick_patch(const struct vdso_image *image)
|
||||
* kernel image.
|
||||
*/
|
||||
int __init init_vdso_image(const struct vdso_image *image,
|
||||
struct vm_special_mapping *vdso_mapping)
|
||||
struct vm_special_mapping *vdso_mapping, bool elf64)
|
||||
{
|
||||
int i;
|
||||
struct page *dp, **dpp = NULL;
|
||||
int dnpages = 0;
|
||||
struct page *cp, **cpp = NULL;
|
||||
int cnpages = (image->size) / PAGE_SIZE;
|
||||
struct page *dp, **dpp = NULL;
|
||||
struct page *cp, **cpp = NULL;
|
||||
struct vdso_elfinfo ei;
|
||||
int i, dnpages = 0;
|
||||
|
||||
if (tlb_type != spitfire) {
|
||||
int err = stick_patch(image, &ei, elf64);
|
||||
if (err)
|
||||
return err;
|
||||
}
|
||||
|
||||
/*
|
||||
* First, the vdso text. This is initialied data, an integral number of
|
||||
@ -88,9 +271,6 @@ int __init init_vdso_image(const struct vdso_image *image,
|
||||
if (!cpp)
|
||||
goto oom;
|
||||
|
||||
if (tlb_type != spitfire)
|
||||
stick_patch(image);
|
||||
|
||||
for (i = 0; i < cnpages; i++) {
|
||||
cp = alloc_page(GFP_KERNEL);
|
||||
if (!cp)
|
||||
@ -153,13 +333,13 @@ static int __init init_vdso(void)
|
||||
{
|
||||
int err = 0;
|
||||
#ifdef CONFIG_SPARC64
|
||||
err = init_vdso_image(&vdso_image_64_builtin, &vdso_mapping64);
|
||||
err = init_vdso_image(&vdso_image_64_builtin, &vdso_mapping64, true);
|
||||
if (err)
|
||||
return err;
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_COMPAT
|
||||
err = init_vdso_image(&vdso_image_32_builtin, &vdso_mapping32);
|
||||
err = init_vdso_image(&vdso_image_32_builtin, &vdso_mapping32, false);
|
||||
#endif
|
||||
return err;
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user