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-rw-r--r--src/internal/dynlink.h57
-rw-r--r--src/ldso/aarch64/start.s18
-rw-r--r--src/ldso/arm/start.s18
-rw-r--r--src/ldso/dlstart.c107
-rw-r--r--src/ldso/dynlink.c347
-rw-r--r--src/ldso/i386/start.s22
-rw-r--r--src/ldso/microblaze/start.s28
-rw-r--r--src/ldso/mips/start.s46
-rw-r--r--src/ldso/or1k/start.s34
-rw-r--r--src/ldso/powerpc/start.s29
-rw-r--r--src/ldso/sh/start.s26
-rw-r--r--src/ldso/start.c8
-rw-r--r--src/ldso/x32/start.s24
-rw-r--r--src/ldso/x86_64/start.s16
14 files changed, 338 insertions, 442 deletions
diff --git a/src/internal/dynlink.h b/src/internal/dynlink.h
new file mode 100644
index 00000000..53661d62
--- /dev/null
+++ b/src/internal/dynlink.h
@@ -0,0 +1,57 @@
+#ifndef _INTERNAL_RELOC_H
+#define _INTERNAL_RELOC_H
+
+#include <features.h>
+#include <elf.h>
+#include <stdint.h>
+
+#if UINTPTR_MAX == 0xffffffff
+typedef Elf32_Ehdr Ehdr;
+typedef Elf32_Phdr Phdr;
+typedef Elf32_Sym Sym;
+#define R_TYPE(x) ((x)&255)
+#define R_SYM(x) ((x)>>8)
+#else
+typedef Elf64_Ehdr Ehdr;
+typedef Elf64_Phdr Phdr;
+typedef Elf64_Sym Sym;
+#define R_TYPE(x) ((x)&0x7fffffff)
+#define R_SYM(x) ((x)>>32)
+#endif
+
+/* These enum constants provide unmatchable default values for
+ * any relocation type the arch does not use. */
+enum {
+ REL_NONE = 0,
+ REL_SYMBOLIC = -100,
+ REL_GOT,
+ REL_PLT,
+ REL_RELATIVE,
+ REL_OFFSET,
+ REL_OFFSET32,
+ REL_COPY,
+ REL_SYM_OR_REL,
+ REL_DTPMOD,
+ REL_DTPOFF,
+ REL_TPOFF,
+ REL_TPOFF_NEG,
+ REL_TLSDESC,
+};
+
+#include "reloc.h"
+
+#define IS_RELATIVE(x) ( \
+ (R_TYPE(x) == REL_RELATIVE) || \
+ (R_TYPE(x) == REL_SYM_OR_REL && !R_SYM(x)) )
+
+#ifndef NEED_MIPS_GOT_RELOCS
+#define NEED_MIPS_GOT_RELOCS 0
+#endif
+
+#define AUX_CNT 32
+#define DYN_CNT 32
+
+typedef void (*stage2_func)(unsigned char *);
+typedef _Noreturn void (*stage3_func)(size_t *);
+
+#endif
diff --git a/src/ldso/aarch64/start.s b/src/ldso/aarch64/start.s
deleted file mode 100644
index 41d1d1e2..00000000
--- a/src/ldso/aarch64/start.s
+++ /dev/null
@@ -1,18 +0,0 @@
-.global _dlstart
-_dlstart:
- ldr x0,[sp]
- add x1,sp,#8
- bl __dynlink
- mov x1,sp
- ldr x2,[x1],#8
-1: sub x2,x2,1
- ldr x3,[x1],#8
- cmn x3,#1
- b.eq 1b
- add x2,x2,1
- str x3,[x1,#-8]!
- str x2,[x1,#-8]!
- mov sp,x1
- mov x1,x0
- mov x0,#0
- blr x1
diff --git a/src/ldso/arm/start.s b/src/ldso/arm/start.s
deleted file mode 100644
index 5dd93b55..00000000
--- a/src/ldso/arm/start.s
+++ /dev/null
@@ -1,18 +0,0 @@
-.text
-.global _dlstart
-_dlstart:
- ldr r0,[sp]
- add r1,sp,#4
- bl __dynlink
- pop {r1}
-1: sub r1,r1,#1
- pop {r2}
- cmp r2,#-1
- beq 1b
- add r1,r1,#1
- push {r1,r2}
- mov r1,r0
- mov r0,#0
- tst r1,#1
- moveq pc,r1
- bx r1
diff --git a/src/ldso/dlstart.c b/src/ldso/dlstart.c
new file mode 100644
index 00000000..5bd2a080
--- /dev/null
+++ b/src/ldso/dlstart.c
@@ -0,0 +1,107 @@
+#include <stddef.h>
+#include "dynlink.h"
+
+#ifdef SHARED
+
+#ifndef START
+#define START "_dlstart"
+#endif
+
+#include "crt_arch.h"
+
+void _dlstart_c(size_t *sp, size_t *dynv)
+{
+ size_t i, aux[AUX_CNT], dyn[DYN_CNT];
+
+ int argc = *sp;
+ char **argv = (void *)(sp+1);
+
+ for (i=argc+1; argv[i]; i++);
+ size_t *auxv = (void *)(argv+i+1);
+
+ for (i=0; i<AUX_CNT; i++) aux[i] = 0;
+ for (i=0; auxv[i]; i+=2) if (auxv[i]<AUX_CNT)
+ aux[auxv[i]] = auxv[i+1];
+
+ for (i=0; i<DYN_CNT; i++) dyn[i] = 0;
+ for (i=0; dynv[i]; i+=2) if (dynv[i]<DYN_CNT)
+ dyn[dynv[i]] = dynv[i+1];
+
+ /* If the dynamic linker is invoked as a command, its load
+ * address is not available in the aux vector. Instead, compute
+ * the load address as the difference between &_DYNAMIC and the
+ * virtual address in the PT_DYNAMIC program header. */
+ unsigned char *base = (void *)aux[AT_BASE];
+ if (!base) {
+ size_t phnum = aux[AT_PHNUM];
+ size_t phentsize = aux[AT_PHENT];
+ Phdr *ph = (void *)aux[AT_PHDR];
+ for (i=phnum; i--; ph = (void *)((char *)ph + phentsize)) {
+ if (ph->p_type == PT_DYNAMIC) {
+ base = (void *)((size_t)dynv - ph->p_vaddr);
+ break;
+ }
+ }
+ }
+
+ /* MIPS uses an ugly packed form for GOT relocations. Since we
+ * can't make function calls yet and the code is tiny anyway,
+ * it's simply inlined here. */
+ if (NEED_MIPS_GOT_RELOCS) {
+ size_t local_cnt = 0;
+ size_t *got = (void *)(base + dyn[DT_PLTGOT]);
+ for (i=0; dynv[i]; i+=2) if (dynv[i]==DT_MIPS_LOCAL_GOTNO)
+ local_cnt = dynv[i+1];
+ for (i=0; i<local_cnt; i++) got[i] += (size_t)base;
+ }
+
+ /* The use of the reloc_info structure and nested loops is a trick
+ * to work around the fact that we can't necessarily make function
+ * calls yet. Each struct in the array serves like the arguments
+ * to a function call. */
+ struct {
+ void *rel;
+ size_t size;
+ size_t stride;
+ } reloc_info[] = {
+ { base+dyn[DT_JMPREL], dyn[DT_PLTRELSZ], 2+(dyn[DT_PLTREL]==DT_RELA) },
+ { base+dyn[DT_REL], dyn[DT_RELSZ], 2 },
+ { base+dyn[DT_RELA], dyn[DT_RELASZ], 3 },
+ { 0, 0, 0 }
+ };
+
+ for (i=0; reloc_info[i].stride; i++) {
+ size_t *rel = reloc_info[i].rel;
+ size_t rel_size = reloc_info[i].size;
+ size_t stride = reloc_info[i].stride;
+ for (; rel_size; rel+=stride, rel_size-=stride*sizeof(size_t)) {
+ if (!IS_RELATIVE(rel[1])) continue;
+ size_t *rel_addr = (void *)(base + rel[0]);
+ size_t addend = stride==3 ? rel[2] : *rel_addr;
+ *rel_addr = (size_t)base + addend;
+ }
+ }
+
+ const char *strings = (void *)(base + dyn[DT_STRTAB]);
+ const Sym *syms = (void *)(base + dyn[DT_SYMTAB]);
+
+ /* Call dynamic linker stage-2, __dls2 */
+ for (i=0; ;i++) {
+ const char *s = strings + syms[i].st_name;
+ if (s[0]=='_' && s[1]=='_' && s[2]=='d'
+ && s[3]=='l' && s[4]=='s' && s[5]=='2' && !s[6])
+ break;
+ }
+ ((stage2_func)(base + syms[i].st_value))(base);
+
+ /* Call dynamic linker stage-3, __dls3 */
+ for (i=0; ;i++) {
+ const char *s = strings + syms[i].st_name;
+ if (s[0]=='_' && s[1]=='_' && s[2]=='d'
+ && s[3]=='l' && s[4]=='s' && s[5]=='3' && !s[6])
+ break;
+ }
+ ((stage3_func)(base + syms[i].st_value))(sp);
+}
+
+#endif
diff --git a/src/ldso/dynlink.c b/src/ldso/dynlink.c
index f6ed8011..1008e3ea 100644
--- a/src/ldso/dynlink.c
+++ b/src/ldso/dynlink.c
@@ -19,26 +19,13 @@
#include <dlfcn.h>
#include "pthread_impl.h"
#include "libc.h"
+#include "dynlink.h"
static int errflag;
static char errbuf[128];
#ifdef SHARED
-#if ULONG_MAX == 0xffffffff
-typedef Elf32_Ehdr Ehdr;
-typedef Elf32_Phdr Phdr;
-typedef Elf32_Sym Sym;
-#define R_TYPE(x) ((x)&255)
-#define R_SYM(x) ((x)>>8)
-#else
-typedef Elf64_Ehdr Ehdr;
-typedef Elf64_Phdr Phdr;
-typedef Elf64_Sym Sym;
-#define R_TYPE(x) ((x)&0xffffffff)
-#define R_SYM(x) ((x)>>32)
-#endif
-
#define MAXP2(a,b) (-(-(a)&-(b)))
#define ALIGN(x,y) ((x)+(y)-1 & -(y))
@@ -88,6 +75,7 @@ struct dso {
volatile int new_dtv_idx, new_tls_idx;
struct td_index *td_index;
struct dso *fini_next;
+ int rel_early_relative, rel_update_got;
char *shortname;
char buf[];
};
@@ -97,26 +85,6 @@ struct symdef {
struct dso *dso;
};
-enum {
- REL_ERR,
- REL_SYMBOLIC,
- REL_GOT,
- REL_PLT,
- REL_RELATIVE,
- REL_OFFSET,
- REL_OFFSET32,
- REL_COPY,
- REL_SYM_OR_REL,
- REL_TLS, /* everything past here is TLS */
- REL_DTPMOD,
- REL_DTPOFF,
- REL_TPOFF,
- REL_TPOFF_NEG,
- REL_TLSDESC,
-};
-
-#include "reloc.h"
-
int __init_tp(void *);
void __init_libc(char **, char *);
@@ -129,7 +97,8 @@ static struct builtin_tls {
} builtin_tls[1];
#define MIN_TLS_ALIGN offsetof(struct builtin_tls, pt)
-static struct dso *head, *tail, *ldso, *fini_head;
+static struct dso ldso;
+static struct dso *head, *tail, *fini_head;
static char *env_path, *sys_path;
static unsigned long long gencnt;
static int runtime;
@@ -145,14 +114,19 @@ static pthread_mutex_t init_fini_lock = { ._m_type = PTHREAD_MUTEX_RECURSIVE };
struct debug *_dl_debug_addr = &debug;
-#define AUX_CNT 38
-#define DYN_CNT 34
+static int dl_strcmp(const char *l, const char *r)
+{
+ for (; *l==*r && *l; l++, r++);
+ return *(unsigned char *)l - *(unsigned char *)r;
+}
+#define strcmp(l,r) dl_strcmp(l,r)
static void decode_vec(size_t *v, size_t *a, size_t cnt)
{
- memset(a, 0, cnt*sizeof(size_t));
- for (; v[0]; v+=2) if (v[0]<cnt) {
- a[0] |= 1ULL<<v[0];
+ size_t i;
+ for (i=0; i<cnt; i++) a[i] = 0;
+ for (; v[0]; v+=2) if (v[0]-1<cnt-1) {
+ a[0] |= 1UL<<v[0];
a[v[0]] = v[1];
}
}
@@ -276,8 +250,6 @@ static struct symdef find_sym(struct dso *dso, const char *s, int need_def)
return def;
}
-#define NO_INLINE_ADDEND (1<<REL_COPY | 1<<REL_GOT | 1<<REL_PLT)
-
ptrdiff_t __tlsdesc_static(), __tlsdesc_dynamic();
static void do_relocs(struct dso *dso, size_t *rel, size_t rel_size, size_t stride)
@@ -288,7 +260,7 @@ static void do_relocs(struct dso *dso, size_t *rel, size_t rel_size, size_t stri
Sym *sym;
const char *name;
void *ctx;
- int astype, type;
+ int type;
int sym_index;
struct symdef def;
size_t *reloc_addr;
@@ -297,14 +269,8 @@ static void do_relocs(struct dso *dso, size_t *rel, size_t rel_size, size_t stri
size_t addend;
for (; rel_size; rel+=stride, rel_size-=stride*sizeof(size_t)) {
- astype = R_TYPE(rel[1]);
- if (!astype) continue;
- type = remap_rel(astype);
- if (!type) {
- error("Error relocating %s: unsupported relocation type %d",
- dso->name, astype);
- continue;
- }
+ if (dso->rel_early_relative && IS_RELATIVE(rel[1])) continue;
+ type = R_TYPE(rel[1]);
sym_index = R_SYM(rel[1]);
reloc_addr = (void *)(base + rel[0]);
if (sym_index) {
@@ -324,14 +290,19 @@ static void do_relocs(struct dso *dso, size_t *rel, size_t rel_size, size_t stri
def.dso = dso;
}
+ int gotplt = (type == REL_GOT || type == REL_PLT);
+ if (dso->rel_update_got && !gotplt) continue;
+
addend = stride>2 ? rel[2]
- : (1<<type & NO_INLINE_ADDEND) ? 0
+ : gotplt || type==REL_COPY ? 0
: *reloc_addr;
sym_val = def.sym ? (size_t)def.dso->base+def.sym->st_value : 0;
tls_val = def.sym ? def.sym->st_value : 0;
switch(type) {
+ case REL_NONE:
+ break;
case REL_OFFSET:
addend -= (size_t)reloc_addr;
case REL_SYMBOLIC:
@@ -395,6 +366,10 @@ static void do_relocs(struct dso *dso, size_t *rel, size_t rel_size, size_t stri
#endif
}
break;
+ default:
+ error("Error relocating %s: unsupported relocation type %d",
+ dso->name, type);
+ continue;
}
}
}
@@ -711,22 +686,22 @@ static struct dso *load_library(const char *name, struct dso *needed_by)
if (!(reported & mask)) {
reported |= mask;
dprintf(1, "\t%s => %s (%p)\n",
- name, ldso->name,
- ldso->base);
+ name, ldso.name,
+ ldso.base);
}
}
is_self = 1;
}
}
}
- if (!strcmp(name, ldso->name)) is_self = 1;
+ if (!strcmp(name, ldso.name)) is_self = 1;
if (is_self) {
- if (!ldso->prev) {
- tail->next = ldso;
- ldso->prev = tail;
- tail = ldso->next ? ldso->next : ldso;
+ if (!ldso.prev) {
+ tail->next = &ldso;
+ ldso.prev = tail;
+ tail = ldso.next ? ldso.next : &ldso;
}
- return ldso;
+ return &ldso;
}
if (strchr(name, '/')) {
pathname = name;
@@ -752,13 +727,13 @@ static struct dso *load_library(const char *name, struct dso *needed_by)
if (!sys_path) {
char *prefix = 0;
size_t prefix_len;
- if (ldso->name[0]=='/') {
+ if (ldso.name[0]=='/') {
char *s, *t, *z;
- for (s=t=z=ldso->name; *s; s++)
+ for (s=t=z=ldso.name; *s; s++)
if (*s=='/') z=t, t=s;
- prefix_len = z-ldso->name;
+ prefix_len = z-ldso.name;
if (prefix_len < PATH_MAX)
- prefix = ldso->name;
+ prefix = ldso.name;
}
if (!prefix) {
prefix = "";
@@ -910,21 +885,40 @@ static void make_global(struct dso *p)
for (; p; p=p->next) p->global = 1;
}
+static void do_mips_relocs(struct dso *p, size_t *got)
+{
+ size_t i, j, rel[2];
+ unsigned char *base = p->base;
+ i=0; search_vec(p->dynv, &i, DT_MIPS_LOCAL_GOTNO);
+ if (p->rel_early_relative) {
+ got += i;
+ } else {
+ while (i--) *got++ += (size_t)base;
+ }
+ j=0; search_vec(p->dynv, &j, DT_MIPS_GOTSYM);
+ i=0; search_vec(p->dynv, &i, DT_MIPS_SYMTABNO);
+ Sym *sym = p->syms + j;
+ rel[0] = (unsigned char *)got - base;
+ for (i-=j; i; i--, sym++, rel[0]+=sizeof(size_t)) {
+ rel[1] = sym-p->syms << 8 | R_MIPS_JUMP_SLOT;
+ do_relocs(p, rel, sizeof rel, 2);
+ }
+}
+
static void reloc_all(struct dso *p)
{
size_t dyn[DYN_CNT] = {0};
for (; p; p=p->next) {
if (p->relocated) continue;
decode_vec(p->dynv, dyn, DYN_CNT);
-#ifdef NEED_ARCH_RELOCS
- do_arch_relocs(p, head);
-#endif
+ if (NEED_MIPS_GOT_RELOCS)
+ do_mips_relocs(p, (void *)(p->base+dyn[DT_PLTGOT]));
do_relocs(p, (void *)(p->base+dyn[DT_JMPREL]), dyn[DT_PLTRELSZ],
2+(dyn[DT_PLTREL]==DT_RELA));
do_relocs(p, (void *)(p->base+dyn[DT_REL]), dyn[DT_RELSZ], 2);
do_relocs(p, (void *)(p->base+dyn[DT_RELA]), dyn[DT_RELASZ], 3);
- if (p->relro_start != p->relro_end &&
+ if (head != &ldso && p->relro_start != p->relro_end &&
mprotect(p->base+p->relro_start, p->relro_end-p->relro_start, PROT_READ) < 0) {
error("Error relocating %s: RELRO protection failed: %m",
p->name);
@@ -1121,19 +1115,52 @@ static void update_tls_size()
tls_align);
}
-void *__dynlink(int argc, char **argv)
+/* Stage 1 of the dynamic linker is defined in dlstart.c. It calls the
+ * following stage 2 and stage 3 functions via primitive symbolic lookup
+ * since it does not have access to their addresses to begin with. */
+
+/* Stage 2 of the dynamic linker is called after relative relocations
+ * have been processed. It can make function calls to static functions
+ * and access string literals and static data, but cannot use extern
+ * symbols. Its job is to perform symbolic relocations on the dynamic
+ * linker itself, but some of the relocations performed may need to be
+ * replaced later due to copy relocations in the main program. */
+
+void __dls2(unsigned char *base)
{
- size_t aux[AUX_CNT] = {0};
+ Ehdr *ehdr = (void *)base;
+ ldso.base = base;
+ ldso.name = ldso.shortname = "libc.so";
+ ldso.global = 1;
+ ldso.phnum = ehdr->e_phnum;
+ ldso.phdr = (void *)(base + ehdr->e_phoff);
+ ldso.phentsize = ehdr->e_phentsize;
+ ldso.rel_early_relative = 1;
+ kernel_mapped_dso(&ldso);
+ decode_dyn(&ldso);
+
+ head = &ldso;
+ reloc_all(&ldso);
+
+ ldso.relocated = 0;
+ ldso.rel_update_got = 1;
+}
+
+/* Stage 3 of the dynamic linker is called with the dynamic linker/libc
+ * fully functional. Its job is to load (if not already loaded) and
+ * process dependencies and relocations for the main application and
+ * transfer control to its entry point. */
+
+_Noreturn void __dls3(size_t *sp)
+{
+ static struct dso app, vdso;
+ size_t aux[AUX_CNT] = {0}, *auxv;
size_t i;
- Phdr *phdr;
- Ehdr *ehdr;
- static struct dso builtin_dsos[3];
- struct dso *const app = builtin_dsos+0;
- struct dso *const lib = builtin_dsos+1;
- struct dso *const vdso = builtin_dsos+2;
char *env_preload=0;
size_t vdso_base;
- size_t *auxv;
+ int argc = *sp;
+ char **argv = (void *)(sp+1);
+ char **argv_orig = argv;
char **envp = argv+argc+1;
void *initial_tls;
@@ -1157,60 +1184,42 @@ void *__dynlink(int argc, char **argv)
libc.page_size = aux[AT_PAGESZ];
libc.auxv = auxv;
- /* If the dynamic linker was invoked as a program itself, AT_BASE
- * will not be set. In that case, we assume the base address is
- * the start of the page containing the PHDRs; I don't know any
- * better approach... */
- if (!aux[AT_BASE]) {
- aux[AT_BASE] = aux[AT_PHDR] & -PAGE_SIZE;
- aux[AT_PHDR] = aux[AT_PHENT] = aux[AT_PHNUM] = 0;
- }
-
- /* The dynamic linker load address is passed by the kernel
- * in the AUX vector, so this is easy. */
- lib->base = (void *)aux[AT_BASE];
- lib->name = lib->shortname = "libc.so";
- lib->global = 1;
- ehdr = (void *)lib->base;
- lib->phnum = ehdr->e_phnum;
- lib->phdr = (void *)(aux[AT_BASE]+ehdr->e_phoff);
- lib->phentsize = ehdr->e_phentsize;
- kernel_mapped_dso(lib);
- decode_dyn(lib);
-
- if (aux[AT_PHDR]) {
+ /* If the main program was already loaded by the kernel,
+ * AT_PHDR will point to some location other than the dynamic
+ * linker's program headers. */
+ if (aux[AT_PHDR] != (size_t)ldso.phdr) {
size_t interp_off = 0;
size_t tls_image = 0;
/* Find load address of the main program, via AT_PHDR vs PT_PHDR. */
- app->phdr = phdr = (void *)aux[AT_PHDR];
- app->phnum = aux[AT_PHNUM];
- app->phentsize = aux[AT_PHENT];
+ Phdr *phdr = app.phdr = (void *)aux[AT_PHDR];
+ app.phnum = aux[AT_PHNUM];
+ app.phentsize = aux[AT_PHENT];
for (i=aux[AT_PHNUM]; i; i--, phdr=(void *)((char *)phdr + aux[AT_PHENT])) {
if (phdr->p_type == PT_PHDR)
- app->base = (void *)(aux[AT_PHDR] - phdr->p_vaddr);
+ app.base = (void *)(aux[AT_PHDR] - phdr->p_vaddr);
else if (phdr->p_type == PT_INTERP)
interp_off = (size_t)phdr->p_vaddr;
else if (phdr->p_type == PT_TLS) {
tls_image = phdr->p_vaddr;
- app->tls_len = phdr->p_filesz;
- app->tls_size = phdr->p_memsz;
- app->tls_align = phdr->p_align;
+ app.tls_len = phdr->p_filesz;
+ app.tls_size = phdr->p_memsz;
+ app.tls_align = phdr->p_align;
}
}
- if (app->tls_size) app->tls_image = (char *)app->base + tls_image;
- if (interp_off) lib->name = (char *)app->base + interp_off;
+ if (app.tls_size) app.tls_image = (char *)app.base + tls_image;
+ if (interp_off) ldso.name = (char *)app.base + interp_off;
if ((aux[0] & (1UL<<AT_EXECFN))
&& strncmp((char *)aux[AT_EXECFN], "/proc/", 6))
- app->name = (char *)aux[AT_EXECFN];
+ app.name = (char *)aux[AT_EXECFN];
else
- app->name = argv[0];
- kernel_mapped_dso(app);
+ app.name = argv[0];
+ kernel_mapped_dso(&app);
} else {
int fd;
char *ldname = argv[0];
size_t l = strlen(ldname);
if (l >= 3 && !strcmp(ldname+l-3, "ldd")) ldd_mode = 1;
- *argv++ = (void *)-1;
+ argv++;
while (argv[0] && argv[0][0]=='-' && argv[0][1]=='-') {
char *opt = argv[0]+2;
*argv++ = (void *)-1;
@@ -1229,8 +1238,8 @@ void *__dynlink(int argc, char **argv)
} else {
argv[0] = 0;
}
- argv[-1] = (void *)-1;
}
+ argv[-1] = (void *)(argc - (argv-argv_orig));
if (!argv[0]) {
dprintf(2, "musl libc\n"
"Version %s\n"
@@ -1246,96 +1255,88 @@ void *__dynlink(int argc, char **argv)
_exit(1);
}
runtime = 1;
- ehdr = (void *)map_library(fd, app);
+ Ehdr *ehdr = (void *)map_library(fd, &app);
if (!ehdr) {
dprintf(2, "%s: %s: Not a valid dynamic program\n", ldname, argv[0]);
_exit(1);
}
runtime = 0;
close(fd);
- lib->name = ldname;
- app->name = argv[0];
- aux[AT_ENTRY] = (size_t)app->base + ehdr->e_entry;
+ ldso.name = ldname;
+ app.name = argv[0];
+ aux[AT_ENTRY] = (size_t)app.base + ehdr->e_entry;
/* Find the name that would have been used for the dynamic
* linker had ldd not taken its place. */
if (ldd_mode) {
- for (i=0; i<app->phnum; i++) {
- if (app->phdr[i].p_type == PT_INTERP)
- lib->name = (void *)(app->base
- + app->phdr[i].p_vaddr);
+ for (i=0; i<app.phnum; i++) {
+ if (app.phdr[i].p_type == PT_INTERP)
+ ldso.name = (void *)(app.base
+ + app.phdr[i].p_vaddr);
}
- dprintf(1, "\t%s (%p)\n", lib->name, lib->base);
+ dprintf(1, "\t%s (%p)\n", ldso.name, ldso.base);
}
}
- if (app->tls_size) {
- app->tls_id = tls_cnt = 1;
+ if (app.tls_size) {
+ app.tls_id = tls_cnt = 1;
#ifdef TLS_ABOVE_TP
- app->tls_offset = 0;
- tls_offset = app->tls_size
- + ( -((uintptr_t)app->tls_image + app->tls_size)
- & (app->tls_align-1) );
+ app.tls_offset = 0;
+ tls_offset = app.tls_size
+ + ( -((uintptr_t)app.tls_image + app.tls_size)
+ & (app.tls_align-1) );
#else
- tls_offset = app->tls_offset = app->tls_size
- + ( -((uintptr_t)app->tls_image + app->tls_size)
- & (app->tls_align-1) );
+ tls_offset = app.tls_offset = app.tls_size
+ + ( -((uintptr_t)app.tls_image + app.tls_size)
+ & (app.tls_align-1) );
#endif
- tls_align = MAXP2(tls_align, app->tls_align);
+ tls_align = MAXP2(tls_align, app.tls_align);
}
- app->global = 1;
- decode_dyn(app);
+ app.global = 1;
+ decode_dyn(&app);
/* Attach to vdso, if provided by the kernel */
if (search_vec(auxv, &vdso_base, AT_SYSINFO_EHDR)) {
- ehdr = (void *)vdso_base;
- vdso->phdr = phdr = (void *)(vdso_base + ehdr->e_phoff);
- vdso->phnum = ehdr->e_phnum;
- vdso->phentsize = ehdr->e_phentsize;
+ Ehdr *ehdr = (void *)vdso_base;
+ Phdr *phdr = vdso.phdr = (void *)(vdso_base + ehdr->e_phoff);
+ vdso.phnum = ehdr->e_phnum;
+ vdso.phentsize = ehdr->e_phentsize;
for (i=ehdr->e_phnum; i; i--, phdr=(void *)((char *)phdr + ehdr->e_phentsize)) {
if (phdr->p_type == PT_DYNAMIC)
- vdso->dynv = (void *)(vdso_base + phdr->p_offset);
+ vdso.dynv = (void *)(vdso_base + phdr->p_offset);
if (phdr->p_type == PT_LOAD)
- vdso->base = (void *)(vdso_base - phdr->p_vaddr + phdr->p_offset);
+ vdso.base = (void *)(vdso_base - phdr->p_vaddr + phdr->p_offset);
}
- vdso->name = "";
- vdso->shortname = "linux-gate.so.1";
- vdso->global = 1;
- decode_dyn(vdso);
- vdso->prev = lib;
- lib->next = vdso;
+ vdso.name = "";
+ vdso.shortname = "linux-gate.so.1";
+ vdso.global = 1;
+ vdso.relocated = 1;
+ decode_dyn(&vdso);
+ vdso.prev = &ldso;
+ ldso.next = &vdso;
}
- /* Initial dso chain consists only of the app. We temporarily
- * append the dynamic linker/libc so we can relocate it, then
- * restore the initial chain in preparation for loading third
- * party libraries (preload/needed). */
- head = tail = app;
- ldso = lib;
- app->next = lib;
- reloc_all(lib);
- app->next = 0;
-
- /* PAST THIS POINT, ALL LIBC INTERFACES ARE FULLY USABLE. */
+ /* Initial dso chain consists only of the app. */
+ head = tail = &app;
/* Donate unused parts of app and library mapping to malloc */
- reclaim_gaps(app);
- reclaim_gaps(lib);
+ reclaim_gaps(&app);
+ reclaim_gaps(&ldso);
/* Load preload/needed libraries, add their symbols to the global
- * namespace, and perform all remaining relocations. The main
- * program must be relocated LAST since it may contain copy
- * relocations which depend on libraries' relocations. */
+ * namespace, and perform all remaining relocations. */
if (env_preload) load_preload(env_preload);
- load_deps(app);
- make_global(app);
+ load_deps(&app);
+ make_global(&app);
#ifndef DYNAMIC_IS_RO
- for (i=0; app->dynv[i]; i+=2)
- if (app->dynv[i]==DT_DEBUG)
- app->dynv[i+1] = (size_t)&debug;
+ for (i=0; app.dynv[i]; i+=2)
+ if (app.dynv[i]==DT_DEBUG)
+ app.dynv[i+1] = (size_t)&debug;
#endif
- reloc_all(app->next);
- reloc_all(app);
+ /* The main program must be relocated LAST since it may contin
+ * copy relocations which depend on libraries' relocations. */
+ reloc_all(app.next);
+ reloc_all(&app);
update_tls_size();
if (libc.tls_size > sizeof builtin_tls) {
@@ -1359,14 +1360,13 @@ void *__dynlink(int argc, char **argv)
/* Switch to runtime mode: any further failures in the dynamic
* linker are a reportable failure rather than a fatal startup
- * error. If the dynamic loader (dlopen) will not be used, free
- * all memory used by the dynamic linker. */
+ * error. */
runtime = 1;
debug.ver = 1;
debug.bp = _dl_debug_state;
debug.head = head;
- debug.base = lib->base;
+ debug.base = ldso.base;
debug.state = 0;
_dl_debug_state();
@@ -1375,7 +1375,8 @@ void *__dynlink(int argc, char **argv)
errno = 0;
do_init_fini(tail);
- return (void *)aux[AT_ENTRY];
+ CRTJMP((void *)aux[AT_ENTRY], argv-1);
+ for(;;);
}
void *dlopen(const char *file, int mode)
diff --git a/src/ldso/i386/start.s b/src/ldso/i386/start.s
deleted file mode 100644
index c37a1faa..00000000
--- a/src/ldso/i386/start.s
+++ /dev/null
@@ -1,22 +0,0 @@
-.text
-.global _dlstart
-_dlstart:
- xor %ebp,%ebp
- pop %edi
- mov %esp,%esi
- and $-16,%esp
- push %ebp
- push %ebp
- push %esi
- push %edi
- call __dynlink
- mov %esi,%esp
-1: dec %edi
- pop %esi
- cmp $-1,%esi
- jz 1b
- inc %edi
- push %esi
- push %edi
- xor %edx,%edx
- jmp *%eax
diff --git a/src/ldso/microblaze/start.s b/src/ldso/microblaze/start.s
deleted file mode 100644
index 067e8613..00000000
--- a/src/ldso/microblaze/start.s
+++ /dev/null
@@ -1,28 +0,0 @@
-# FIXME: clearing argv entries
-.global _dlstart
-_dlstart:
- add r19, r0, r0
-
- lw r5, r0, r1
- addi r6, r1, 4
- mfs r7, rpc
- addi r7, r7, _GLOBAL_OFFSET_TABLE_+8
- addi r7, r7, _DYNAMIC@GOTOFF
- brlid r15, __reloc_self@PLT
- addik r1, r1, -16
-
- lwi r5, r1, 16
- brlid r15, __dynlink@PLT
- addi r6, r1, 20
- addik r1, r1, 16
-
- lwi r4, r1, 0
-1: lwi r5, r1, 4
- addi r5, r5, 1
- bnei r5, 1f
- addi r4, r4, -1
- addi r1, r1, 4
- bri 1b
-1: swi r4, r1, 0
- add r5, r0, r0
- bra r3
diff --git a/src/ldso/mips/start.s b/src/ldso/mips/start.s
deleted file mode 100644
index 0cadbf8a..00000000
--- a/src/ldso/mips/start.s
+++ /dev/null
@@ -1,46 +0,0 @@
-.hidden _DYNAMIC
-.hidden __reloc_self
-.set noreorder
-.set nomacro
-.global _dlstart
-.type _dlstart,@function
-_dlstart:
- move $fp, $0
-
- bgezal $0, 1f
- nop
-2: .gpword 2b
- .gpword _DYNAMIC
- .gpword __reloc_self
-1: lw $gp, 0($ra)
- subu $gp, $ra, $gp
-
- lw $4, 0($sp)
- addiu $5, $sp, 4
- lw $6, 4($ra)
- addu $6, $6, $gp
- addiu $7, $gp, -0x7ff0
- subu $sp, $sp, 16
- lw $25, 8($ra)
- add $25, $25, $gp
- jalr $25
- nop
-
- lw $25, %call16(__dynlink)($gp)
- lw $4, 16($sp)
- addiu $5, $sp, 20
- jalr $25
- nop
-
- add $sp, $sp, 16
- li $6, -1
- lw $4, ($sp)
-1: lw $5, 4($sp)
- bne $5, $6, 2f
- nop
- addu $sp, $sp, 4
- addu $4, $4, -1
- b 1b
- nop
-2: sw $4, ($sp)
- jr $2
diff --git a/src/ldso/or1k/start.s b/src/ldso/or1k/start.s
deleted file mode 100644
index 83b7c2c6..00000000
--- a/src/ldso/or1k/start.s
+++ /dev/null
@@ -1,34 +0,0 @@
-.global _dlstart
-_dlstart:
- l.jal 1f
- l.nop
-1: l.movhi r5, gotpchi(_GLOBAL_OFFSET_TABLE_+0)
- l.ori r5, r5, gotpclo(_GLOBAL_OFFSET_TABLE_+4)
- l.add r5, r5, r9
- l.movhi r3, gotoffhi(_DYNAMIC)
- l.ori r3, r3, gotofflo(_DYNAMIC)
- l.add r5, r5, r3
-
- l.lwz r3, 0(r1)
- l.addi r4, r1, 4
- l.jal plt(__reloc_self)
- l.addi r1, r1, -16
-
- l.lwz r3, 16(r1)
- l.jal plt(__dynlink)
- l.addi r4, r1, 20
- l.addi r1, r1, 16
-
- l.lwz r4, 0(r1)
-1: l.addi r4, r4, -1
- l.lwz r5, 4(r1)
- l.sfeqi r5, -1
- l.bf 1b
- l.addi r1, r1, 4
-
- l.addi r4, r4, 1
- l.addi r1, r1, -4
- l.sw 0(r1), r4
-
- l.jr r11
- l.ori r3, r0, 0
diff --git a/src/ldso/powerpc/start.s b/src/ldso/powerpc/start.s
deleted file mode 100644
index 6548d58f..00000000
--- a/src/ldso/powerpc/start.s
+++ /dev/null
@@ -1,29 +0,0 @@
- .global _dlstart
- .type _dlstart,@function
-_dlstart:
- bl 1f
-2: .long _DYNAMIC-2b
-1: mflr 5
- lwz 0, 0(5)
- add 5, 0, 5
- lwz 3, 0(1)
- addi 4, 1, 4
- addi 1, 1, -16
- bl __reloc_self
-
- lwz 3, 16(1)
- addi 4, 1, 20
- bl __dynlink
- addi 1, 1, 16
-
- lwz 4, 0(1)
-1: addi 4, 4, -1
- lwzu 5, 4(1)
- cmpwi 5, -1
- beq- 1b
- addi 4, 4, 1
- stwu 4, -4(1)
-
- mtlr 3
- li 3, 0
- blr
diff --git a/src/ldso/sh/start.s b/src/ldso/sh/start.s
deleted file mode 100644
index 0d2d9136..00000000
--- a/src/ldso/sh/start.s
+++ /dev/null
@@ -1,26 +0,0 @@
-.text
-.global _dlstart
-.type _dlstart, @function
-_dlstart:
- mov.l @r15, r4
- mov r15, r5
- mov.l L1, r0
- bsrf r0
- add #4, r5
-
-2: mov r0, r2
- mov.l @r15+, r1
-1: mov.l @r15+, r0
- cmp/eq #-1, r0
- bt/s 1b
- add #-1, r1
-
- add #1, r1
- mov.l r0, @-r15
- mov.l r1, @-r15
- mov #0, r4
- jmp @r2
- nop
-
-.align 2
-L1: .long __dynlink@PLT-(2b-.)
diff --git a/src/ldso/start.c b/src/ldso/start.c
deleted file mode 100644
index 3471f6ce..00000000
--- a/src/ldso/start.c
+++ /dev/null
@@ -1,8 +0,0 @@
-#include <stdlib.h>
-
-/* stub for archs that lack dynamic linker support */
-
-void _dlstart()
-{
- _Exit(1);
-}
diff --git a/src/ldso/x32/start.s b/src/ldso/x32/start.s
deleted file mode 100644
index 3c3800aa..00000000
--- a/src/ldso/x32/start.s
+++ /dev/null
@@ -1,24 +0,0 @@
-.text
-.global _dlstart
-_dlstart:
- mov (%rsp),%rdi /* move argc into 1st argument slot */
- lea 4(%rsp),%rsi /* move argv into 2nd argument slot */
- call __dynlink
- /* in case the dynlinker was called directly, it sets the "consumed"
- argv values to -1. so we must loop over the array as long as -1
- is in the top argv slot, decrement argc, and then set the stackpointer
- to the new argc as well as argc's new value.
- as the x32 abi has longs in the argv array, we cannot use push/pop.*/
- movl (%rsp),%edi /* copy argc into edi */
- xor %rdx,%rdx /* we use rdx as an offset to the current argv member */
-1: dec %edi
- addl $4, %edx
- movl (%rsp, %rdx), %esi
- cmp $-1,%esi
- jz 1b
- inc %edi
- subl $4, %edx
- lea (%rsp, %rdx), %rsp /* set rsp to new argv[-1] */
- movl %edi, (%rsp) /* write new argc there */
- xor %edx,%edx
- jmp *%rax
diff --git a/src/ldso/x86_64/start.s b/src/ldso/x86_64/start.s
deleted file mode 100644
index 1c5598aa..00000000
--- a/src/ldso/x86_64/start.s
+++ /dev/null
@@ -1,16 +0,0 @@
-.text
-.global _dlstart
-_dlstart:
- mov (%rsp),%rdi
- lea 8(%rsp),%rsi
- call __dynlink
- pop %rdi
-1: dec %edi
- pop %rsi
- cmp $-1,%rsi
- jz 1b
- inc %edi
- push %rsi
- push %rdi
- xor %edx,%edx
- jmp *%rax
generated by cgit v1.2.1 (git 2.18.0) at 2025-11-04 05:25:01 +0000