Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc

Pull sparc fix from David Miller: "Build regression fix" * git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc: sparc: Fix VDSO build with older binutils.

Linus Torvalds committed 8 years ago

Commit e5f6d9a2 parents c300af2 caf539c7 files · +335 −62Browse files

Unified · Split

7 files

arch/sparc/include/asm/vdso.h +0 −2
arch/sparc/vdso/vclock_gettime.c +129 −20
arch/sparc/vdso/vdso-layout.lds.S +0 −3
arch/sparc/vdso/vdso.lds.S +2 −0
arch/sparc/vdso/vdso2c.h +1 −16
arch/sparc/vdso/vdso32/vdso32.lds.S +2 −0
arch/sparc/vdso/vma.c +201 −21

arch/sparc/include/asm/vdso.h+0−2

@@ -9,8 +9,6 @@ struct vdso_image { · 8 unmodified lines
9	9	void *data;
10	10	unsigned long size; /* Always a multiple of PAGE_SIZE */
11	11
12		− unsigned long tick_patch, tick_patch_len;
13		−
14	12	long sym_vvar_start; /* Negative offset to the vvar area */
15	13	};
16	14

arch/sparc/vdso/vclock_gettime.c+129−20

@@ -90,16 +90,15 @@ notrace static __always_inline u64 vread_tick(void) · 89 unmodified lines
90	90	{
91	91	u64 ret;
92	92
93		− __asm__ __volatile__("1:\n\t"
94		− "rd %%tick, %0\n\t"
95		− ".pushsection .tick_patch, \"a\"\n\t"
96		− ".word 1b - ., 1f - .\n\t"
97		− ".popsection\n\t"
98		− ".pushsection .tick_patch_replacement, \"ax\"\n\t"
99		− "1:\n\t"
100		− "rd %%asr24, %0\n\t"
101		− ".popsection\n"
102		− : "=r" (ret));
	93	+ __asm__ __volatile__("rd %%tick, %0" : "=r" (ret));
	94	+ return ret;
	95	+}
	96	+
	97	+notrace static __always_inline u64 vread_tick_stick(void)
	98	+{
	99	+ u64 ret;
	100	+
	101	+ __asm__ __volatile__("rd %%asr24, %0" : "=r" (ret));
103	102	return ret;
104	103	}
105	104	#else
@@ -107,16 +106,18 @@ notrace static __always_inline u64 vread_tick(void) · 1 unmodified line
107	106	{
108	107	register unsigned long long ret asm("o4");
109	108
110		− __asm__ __volatile__("1:\n\t"
111		− "rd %%tick, %L0\n\t"
112		− "srlx %L0, 32, %H0\n\t"
113		− ".pushsection .tick_patch, \"a\"\n\t"
114		− ".word 1b - ., 1f - .\n\t"
115		− ".popsection\n\t"
116		− ".pushsection .tick_patch_replacement, \"ax\"\n\t"
117		− "1:\n\t"
118		− "rd %%asr24, %L0\n\t"
119		− ".popsection\n"
	109	+ __asm__ __volatile__("rd %%tick, %L0\n\t"
	110	+ "srlx %L0, 32, %H0"
	111	+ : "=r" (ret));
	112	+ return ret;
	113	+}
	114	+
	115	+notrace static __always_inline u64 vread_tick_stick(void)
	116	+{
	117	+ register unsigned long long ret asm("o4");
	118	+
	119	+ __asm__ __volatile__("rd %%asr24, %L0\n\t"
	120	+ "srlx %L0, 32, %H0"
120	121	: "=r" (ret));
121	122	return ret;
122	123	}
@@ -132,6 +133,16 @@ notrace static __always_inline u64 vgetsns(struct vvar_data *vvar) · 9 unmodified lines
132	133	return v * vvar->clock.mult;
133	134	}
134	135
	136	+notrace static __always_inline u64 vgetsns_stick(struct vvar_data *vvar)
	137	+{
	138	+ u64 v;
	139	+ u64 cycles;
	140	+
	141	+ cycles = vread_tick_stick();
	142	+ v = (cycles - vvar->clock.cycle_last) & vvar->clock.mask;
	143	+ return v * vvar->clock.mult;
	144	+}
	145	+
135	146	notrace static __always_inline int do_realtime(struct vvar_data *vvar,
136	147	struct timespec *ts)
137	148	{
@@ -152,6 +163,26 @@ notrace static __always_inline int do_realtime(struct vvar_data *vvar, · 14 unmodified lines
152	163	return 0;
153	164	}
154	165
	166	+notrace static __always_inline int do_realtime_stick(struct vvar_data *vvar,
	167	+ struct timespec *ts)
	168	+{
	169	+ unsigned long seq;
	170	+ u64 ns;
	171	+
	172	+ do {
	173	+ seq = vvar_read_begin(vvar);
	174	+ ts->tv_sec = vvar->wall_time_sec;
	175	+ ns = vvar->wall_time_snsec;
	176	+ ns += vgetsns_stick(vvar);
	177	+ ns >>= vvar->clock.shift;
	178	+ } while (unlikely(vvar_read_retry(vvar, seq)));
	179	+
	180	+ ts->tv_sec += __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns);
	181	+ ts->tv_nsec = ns;
	182	+
	183	+ return 0;
	184	+}
	185	+
155	186	notrace static __always_inline int do_monotonic(struct vvar_data *vvar,
156	187	struct timespec *ts)
157	188	{
@@ -172,6 +203,26 @@ notrace static __always_inline int do_monotonic(struct vvar_data *vvar, · 14 unmodified lines
172	203	return 0;
173	204	}
174	205
	206	+notrace static __always_inline int do_monotonic_stick(struct vvar_data *vvar,
	207	+ struct timespec *ts)
	208	+{
	209	+ unsigned long seq;
	210	+ u64 ns;
	211	+
	212	+ do {
	213	+ seq = vvar_read_begin(vvar);
	214	+ ts->tv_sec = vvar->monotonic_time_sec;
	215	+ ns = vvar->monotonic_time_snsec;
	216	+ ns += vgetsns_stick(vvar);
	217	+ ns >>= vvar->clock.shift;
	218	+ } while (unlikely(vvar_read_retry(vvar, seq)));
	219	+
	220	+ ts->tv_sec += __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns);
	221	+ ts->tv_nsec = ns;
	222	+
	223	+ return 0;
	224	+}
	225	+
175	226	notrace static int do_realtime_coarse(struct vvar_data *vvar,
176	227	struct timespec *ts)
177	228	{
@@ -227,6 +278,31 @@ int · 49 unmodified lines
227	278	clock_gettime(clockid_t, struct timespec *)
228	279	__attribute__((weak, alias("__vdso_clock_gettime")));
229	280
	281	+notrace int
	282	+__vdso_clock_gettime_stick(clockid_t clock, struct timespec *ts)
	283	+{
	284	+ struct vvar_data *vvd = get_vvar_data();
	285	+
	286	+ switch (clock) {
	287	+ case CLOCK_REALTIME:
	288	+ if (unlikely(vvd->vclock_mode == VCLOCK_NONE))
	289	+ break;
	290	+ return do_realtime_stick(vvd, ts);
	291	+ case CLOCK_MONOTONIC:
	292	+ if (unlikely(vvd->vclock_mode == VCLOCK_NONE))
	293	+ break;
	294	+ return do_monotonic_stick(vvd, ts);
	295	+ case CLOCK_REALTIME_COARSE:
	296	+ return do_realtime_coarse(vvd, ts);
	297	+ case CLOCK_MONOTONIC_COARSE:
	298	+ return do_monotonic_coarse(vvd, ts);
	299	+ }
	300	+ /*
	301	+ * Unknown clock ID ? Fall back to the syscall.
	302	+ */
	303	+ return vdso_fallback_gettime(clock, ts);
	304	+}
	305	+
230	306	notrace int
231	307	__vdso_gettimeofday(struct timeval tv, struct timezone tz)
232	308	{
@@ -262,3 +338,36 @@ __vdso_gettimeofday(struct timeval tv, struct timezone tz) · 29 unmodified lines
262	338	int
263	339	gettimeofday(struct timeval , struct timezone )
264	340	__attribute__((weak, alias("__vdso_gettimeofday")));
	341	+
	342	+notrace int
	343	+__vdso_gettimeofday_stick(struct timeval tv, struct timezone tz)
	344	+{
	345	+ struct vvar_data *vvd = get_vvar_data();
	346	+
	347	+ if (likely(vvd->vclock_mode != VCLOCK_NONE)) {
	348	+ if (likely(tv != NULL)) {
	349	+ union tstv_t {
	350	+ struct timespec ts;
	351	+ struct timeval tv;
	352	+ } tstv = (union tstv_t ) tv;
	353	+ do_realtime_stick(vvd, &tstv->ts);
	354	+ /*
	355	+ * Assign before dividing to ensure that the division is
	356	+ * done in the type of tv_usec, not tv_nsec.
	357	+ *
	358	+ * There cannot be > 1 billion usec in a second:
	359	+ * do_realtime() has already distributed such overflow
	360	+ * into tv_sec. So we can assign it to an int safely.
	361	+ */
	362	+ tstv->tv.tv_usec = tstv->ts.tv_nsec;
	363	+ tstv->tv.tv_usec /= 1000;
	364	+ }
	365	+ if (unlikely(tz != NULL)) {
	366	+ /* Avoid memcpy. Some old compilers fail to inline it */
	367	+ tz->tz_minuteswest = vvd->tz_minuteswest;
	368	+ tz->tz_dsttime = vvd->tz_dsttime;
	369	+ }
	370	+ return 0;
	371	+ }
	372	+ return vdso_fallback_gettimeofday(tv, tz);
	373	+}

arch/sparc/vdso/vdso-layout.lds.S+0−3

@@ -73,9 +73,6 @@ SECTIONS · 72 unmodified lines
73	73
74	74	.text : { (.text) } :text =0x90909090,
75	75
76		− .tick_patch : { *(.tick_patch) } :text
77		− .tick_patch_insns : { *(.tick_patch_insns) } :text
78		−
79	76	/DISCARD/ : {
80	77	*(.discard)
81	78	(.discard.)

arch/sparc/vdso/vdso.lds.S+2−0

@@ -18,8 +18,10 @@ VERSION { · 17 unmodified lines
18	18	global:
19	19	clock_gettime;
20	20	__vdso_clock_gettime;
	21	+ __vdso_clock_gettime_stick;
21	22	gettimeofday;
22	23	__vdso_gettimeofday;
	24	+ __vdso_gettimeofday_stick;
23	25	local: *;
24	26	};
25	27	}

arch/sparc/vdso/vdso2c.h+1−16

@@ -17,11 +17,9 @@ static void BITSFUNC(go)(void *raw_addr, size_t raw_len, · 16 unmodified lines
17	17	unsigned long mapping_size;
18	18	int i;
19	19	unsigned long j;
20		− ELF(Shdr) symtab_hdr = NULL, strtab_hdr, *secstrings_hdr,
21		− *patch_sec = NULL;
	20	+ ELF(Shdr) symtab_hdr = NULL, strtab_hdr;
22	21	ELF(Ehdr) hdr = (ELF(Ehdr) )raw_addr;
23	22	ELF(Dyn) dyn = 0, dyn_end = 0;
24		− const char *secstrings;
25	23	INT_BITS syms[NSYMS] = {};
26	24
27	25	ELF(Phdr) pt = (ELF(Phdr) )(raw_addr + GET_BE(&hdr->e_phoff));
@@ -64,18 +62,11 @@ static void BITSFUNC(go)(void *raw_addr, size_t raw_len, · 36 unmodified lines
64	62	}
65	63
66	64	/* Walk the section table */
67		− secstrings_hdr = raw_addr + GET_BE(&hdr->e_shoff) +
68		− GET_BE(&hdr->e_shentsize)*GET_BE(&hdr->e_shstrndx);
69		− secstrings = raw_addr + GET_BE(&secstrings_hdr->sh_offset);
70	65	for (i = 0; i < GET_BE(&hdr->e_shnum); i++) {
71	66	ELF(Shdr) *sh = raw_addr + GET_BE(&hdr->e_shoff) +
72	67	GET_BE(&hdr->e_shentsize) * i;
73	68	if (GET_BE(&sh->sh_type) == SHT_SYMTAB)
74	69	symtab_hdr = sh;
75		−
76		− if (!strcmp(secstrings + GET_BE(&sh->sh_name),
77		− ".tick_patch"))
78		− patch_sec = sh;
79	70	}
80	71
81	72	if (!symtab_hdr)
@@ -142,12 +133,6 @@ static void BITSFUNC(go)(void *raw_addr, size_t raw_len, · 60 unmodified lines
142	133	fprintf(outfile, "const struct vdso_image %s_builtin = {\n", name);
143	134	fprintf(outfile, "\t.data = raw_data,\n");
144	135	fprintf(outfile, "\t.size = %lu,\n", mapping_size);
145		− if (patch_sec) {
146		− fprintf(outfile, "\t.tick_patch = %lu,\n",
147		− (unsigned long)GET_BE(&patch_sec->sh_offset));
148		− fprintf(outfile, "\t.tick_patch_len = %lu,\n",
149		− (unsigned long)GET_BE(&patch_sec->sh_size));
150		− }
151	136	for (i = 0; i < NSYMS; i++) {
152	137	if (required_syms[i].export && syms[i])
153	138	fprintf(outfile, "\t.sym_%s = %" PRIi64 ",\n",

arch/sparc/vdso/vdso32/vdso32.lds.S+2−0

@@ -17,8 +17,10 @@ VERSION { · 16 unmodified lines
17	17	global:
18	18	clock_gettime;
19	19	__vdso_clock_gettime;
	20	+ __vdso_clock_gettime_stick;
20	21	gettimeofday;
21	22	__vdso_gettimeofday;
	23	+ __vdso_gettimeofday_stick;
22	24	local: *;
23	25	};
24	26	}

arch/sparc/vdso/vma.c+201−21

@@ -42,24 +42,201 @@ static struct vm_special_mapping vdso_mapping32 = { · 41 unmodified lines
42	42
43	43	struct vvar_data *vvar_data;
44	44
45		−struct tick_patch_entry {
46		− s32 orig, repl;
	45	+struct vdso_elfinfo32 {
	46	+ Elf32_Ehdr *hdr;
	47	+ Elf32_Sym *dynsym;
	48	+ unsigned long dynsymsize;
	49	+ const char *dynstr;
	50	+ unsigned long text;
47	51	};
48	52
49		−static void stick_patch(const struct vdso_image *image)
	53	+struct vdso_elfinfo64 {
	54	+ Elf64_Ehdr *hdr;
	55	+ Elf64_Sym *dynsym;
	56	+ unsigned long dynsymsize;
	57	+ const char *dynstr;
	58	+ unsigned long text;
	59	+};
	60	+
	61	+struct vdso_elfinfo {
	62	+ union {
	63	+ struct vdso_elfinfo32 elf32;
	64	+ struct vdso_elfinfo64 elf64;
	65	+ } u;
	66	+};
	67	+
	68	+static void one_section64(struct vdso_elfinfo64 e, const char *name,
	69	+ unsigned long *size)
	70	+{
	71	+ const char *snames;
	72	+ Elf64_Shdr *shdrs;
	73	+ unsigned int i;
	74	+
	75	+ shdrs = (void *)e->hdr + e->hdr->e_shoff;
	76	+ snames = (void *)e->hdr + shdrs[e->hdr->e_shstrndx].sh_offset;
	77	+ for (i = 1; i < e->hdr->e_shnum; i++) {
	78	+ if (!strcmp(snames+shdrs[i].sh_name, name)) {
	79	+ if (size)
	80	+ *size = shdrs[i].sh_size;
	81	+ return (void *)e->hdr + shdrs[i].sh_offset;
	82	+ }
	83	+ }
	84	+ return NULL;
	85	+}
	86	+
	87	+static int find_sections64(const struct vdso_image image, struct vdso_elfinfo _e)
	88	+{
	89	+ struct vdso_elfinfo64 *e = &_e->u.elf64;
	90	+
	91	+ e->hdr = image->data;
	92	+ e->dynsym = one_section64(e, ".dynsym", &e->dynsymsize);
	93	+ e->dynstr = one_section64(e, ".dynstr", NULL);
	94	+
	95	+ if (!e->dynsym \|\| !e->dynstr) {
	96	+ pr_err("VDSO64: Missing symbol sections.\n");
	97	+ return -ENODEV;
	98	+ }
	99	+ return 0;
	100	+}
	101	+
	102	+static Elf64_Sym find_sym64(const struct vdso_elfinfo64 e, const char *name)
	103	+{
	104	+ unsigned int i;
	105	+
	106	+ for (i = 0; i < (e->dynsymsize / sizeof(Elf64_Sym)); i++) {
	107	+ Elf64_Sym *s = &e->dynsym[i];
	108	+ if (s->st_name == 0)
	109	+ continue;
	110	+ if (!strcmp(e->dynstr + s->st_name, name))
	111	+ return s;
	112	+ }
	113	+ return NULL;
	114	+}
	115	+
	116	+static int patchsym64(struct vdso_elfinfo _e, const char orig,
	117	+ const char *new)
	118	+{
	119	+ struct vdso_elfinfo64 *e = &_e->u.elf64;
	120	+ Elf64_Sym *osym = find_sym64(e, orig);
	121	+ Elf64_Sym *nsym = find_sym64(e, new);
	122	+
	123	+ if (!nsym \|\| !osym) {
	124	+ pr_err("VDSO64: Missing symbols.\n");
	125	+ return -ENODEV;
	126	+ }
	127	+ osym->st_value = nsym->st_value;
	128	+ osym->st_size = nsym->st_size;
	129	+ osym->st_info = nsym->st_info;
	130	+ osym->st_other = nsym->st_other;
	131	+ osym->st_shndx = nsym->st_shndx;
	132	+
	133	+ return 0;
	134	+}
	135	+
	136	+static void one_section32(struct vdso_elfinfo32 e, const char *name,
	137	+ unsigned long *size)
	138	+{
	139	+ const char *snames;
	140	+ Elf32_Shdr *shdrs;
	141	+ unsigned int i;
	142	+
	143	+ shdrs = (void *)e->hdr + e->hdr->e_shoff;
	144	+ snames = (void *)e->hdr + shdrs[e->hdr->e_shstrndx].sh_offset;
	145	+ for (i = 1; i < e->hdr->e_shnum; i++) {
	146	+ if (!strcmp(snames+shdrs[i].sh_name, name)) {
	147	+ if (size)
	148	+ *size = shdrs[i].sh_size;
	149	+ return (void *)e->hdr + shdrs[i].sh_offset;
	150	+ }
	151	+ }
	152	+ return NULL;
	153	+}
	154	+
	155	+static int find_sections32(const struct vdso_image image, struct vdso_elfinfo _e)
	156	+{
	157	+ struct vdso_elfinfo32 *e = &_e->u.elf32;
	158	+
	159	+ e->hdr = image->data;
	160	+ e->dynsym = one_section32(e, ".dynsym", &e->dynsymsize);
	161	+ e->dynstr = one_section32(e, ".dynstr", NULL);
	162	+
	163	+ if (!e->dynsym \|\| !e->dynstr) {
	164	+ pr_err("VDSO32: Missing symbol sections.\n");
	165	+ return -ENODEV;
	166	+ }
	167	+ return 0;
	168	+}
	169	+
	170	+static Elf32_Sym find_sym32(const struct vdso_elfinfo32 e, const char *name)
50	171	{
51		− struct tick_patch_entry p, p_end;
	172	+ unsigned int i;
	173	+
	174	+ for (i = 0; i < (e->dynsymsize / sizeof(Elf32_Sym)); i++) {
	175	+ Elf32_Sym *s = &e->dynsym[i];
	176	+ if (s->st_name == 0)
	177	+ continue;
	178	+ if (!strcmp(e->dynstr + s->st_name, name))
	179	+ return s;
	180	+ }
	181	+ return NULL;
	182	+}
52	183
53		− p = image->data + image->tick_patch;
54		− p_end = (void *)p + image->tick_patch_len;
55		− while (p < p_end) {
56		− u32 instr = (void )&p->orig + p->orig;
57		− u32 repl = (void )&p->repl + p->repl;
	184	+static int patchsym32(struct vdso_elfinfo _e, const char orig,
	185	+ const char *new)
	186	+{
	187	+ struct vdso_elfinfo32 *e = &_e->u.elf32;
	188	+ Elf32_Sym *osym = find_sym32(e, orig);
	189	+ Elf32_Sym *nsym = find_sym32(e, new);
58	190
59		− instr = repl;
60		− flushi(instr);
61		− p++;
	191	+ if (!nsym \|\| !osym) {
	192	+ pr_err("VDSO32: Missing symbols.\n");
	193	+ return -ENODEV;
62	194	}
	195	+ osym->st_value = nsym->st_value;
	196	+ osym->st_size = nsym->st_size;
	197	+ osym->st_info = nsym->st_info;
	198	+ osym->st_other = nsym->st_other;
	199	+ osym->st_shndx = nsym->st_shndx;
	200	+
	201	+ return 0;
	202	+}
	203	+
	204	+static int find_sections(const struct vdso_image image, struct vdso_elfinfo e,
	205	+ bool elf64)
	206	+{
	207	+ if (elf64)
	208	+ return find_sections64(image, e);
	209	+ else
	210	+ return find_sections32(image, e);
	211	+}
	212	+
	213	+static int patch_one_symbol(struct vdso_elfinfo e, const char orig,
	214	+ const char *new_target, bool elf64)
	215	+{
	216	+ if (elf64)
	217	+ return patchsym64(e, orig, new_target);
	218	+ else
	219	+ return patchsym32(e, orig, new_target);
	220	+}
	221	+
	222	+static int stick_patch(const struct vdso_image image, struct vdso_elfinfo e, bool elf64)
	223	+{
	224	+ int err;
	225	+
	226	+ err = find_sections(image, e, elf64);
	227	+ if (err)
	228	+ return err;
	229	+
	230	+ err = patch_one_symbol(e,
	231	+ "__vdso_gettimeofday",
	232	+ "__vdso_gettimeofday_stick", elf64);
	233	+ if (err)
	234	+ return err;
	235	+
	236	+ return patch_one_symbol(e,
	237	+ "__vdso_clock_gettime",
	238	+ "__vdso_clock_gettime_stick", elf64);
	239	+ return 0;
63	240	}
64	241
65	242	/*
@@ -67,13 +244,19 @@ static void stick_patch(const struct vdso_image *image) · 1 unmodified line
67	244	* kernel image.
68	245	*/
69	246	int __init init_vdso_image(const struct vdso_image *image,
70		− struct vm_special_mapping *vdso_mapping)
	247	+ struct vm_special_mapping *vdso_mapping, bool elf64)
71	248	{
72		− int i;
	249	+ int cnpages = (image->size) / PAGE_SIZE;
73	250	struct page dp, *dpp = NULL;
74		− int dnpages = 0;
75	251	struct page cp, *cpp = NULL;
76		− int cnpages = (image->size) / PAGE_SIZE;
	252	+ struct vdso_elfinfo ei;
	253	+ int i, dnpages = 0;
	254	+
	255	+ if (tlb_type != spitfire) {
	256	+ int err = stick_patch(image, &ei, elf64);
	257	+ if (err)
	258	+ return err;
	259	+ }
77	260
78	261	/*
79	262	* 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, · 8 unmodified lines
88	271	if (!cpp)
89	272	goto oom;
90	273
91		− if (tlb_type != spitfire)
92		− stick_patch(image);
93		−
94	274	for (i = 0; i < cnpages; i++) {
95	275	cp = alloc_page(GFP_KERNEL);
96	276	if (!cp)
@@ -153,13 +333,13 @@ static int __init init_vdso(void) · 56 unmodified lines
153	333	{
154	334	int err = 0;
155	335	#ifdef CONFIG_SPARC64
156		− err = init_vdso_image(&vdso_image_64_builtin, &vdso_mapping64);
	336	+ err = init_vdso_image(&vdso_image_64_builtin, &vdso_mapping64, true);
157	337	if (err)
158	338	return err;
159	339	#endif
160	340
161	341	#ifdef CONFIG_COMPAT
162		− err = init_vdso_image(&vdso_image_32_builtin, &vdso_mapping32);
	342	+ err = init_vdso_image(&vdso_image_32_builtin, &vdso_mapping32, false);
163	343	#endif
164	344	return err;
165	345

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc

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