remove unused struct dso members from dynlink.c

[musl] / ldso / dynlink.c

diff --git a/ldso/dynlink.c b/ldso/dynlink.c
index 4f090ad..ad0cdba 100644 (file)
--- a/ldso/dynlink.c
+++ b/ldso/dynlink.c
@@ -1,4 +1,5 @@
 #define _GNU_SOURCE
+#define SYSCALL_NO_TLS 1
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdarg.h>
@@ -30,6 +31,7 @@ static void error(const char *, ...);
 #define ALIGN(x,y) ((x)+(y)-1 & -(y))
 
 #define container_of(p,t,m) ((t*)((char *)(p)-offsetof(t,m)))
+#define countof(a) ((sizeof (a))/(sizeof (a)[0]))
 
 struct debug {
        int ver;
@@ -84,7 +86,6 @@ struct dso {
        size_t relro_start, relro_end;
        uintptr_t *new_dtv;
        unsigned char *new_tls;
-       volatile int new_dtv_idx, new_tls_idx;
        struct td_index *td_index;
        struct dso *fini_next;
        char *shortname;
@@ -135,6 +136,7 @@ static pthread_mutex_t init_fini_lock;
 static pthread_cond_t ctor_cond;
 static struct dso *builtin_deps[2];
 static struct dso *const no_deps[1];
+static struct dso *builtin_ctor_queue[4];
 static struct dso **main_ctor_queue;
 static struct fdpic_loadmap *app_loadmap;
 static struct fdpic_dummy_loadmap app_dummy_loadmap;
@@ -918,7 +920,7 @@ static void *dl_mmap(size_t n)
 #else
        p = (void *)__syscall(SYS_mmap, 0, n, prot, flags, -1, 0);
 #endif
-       return p == MAP_FAILED ? 0 : p;
+       return (unsigned long)p > -4096UL ? 0 : p;
 }
 
 static void makefuncdescs(struct dso *p)
@@ -1405,7 +1407,10 @@ static struct dso **queue_ctors(struct dso *dso)
                        p->mark = 0;
        }
        cnt++; /* termination slot */
-       stack = queue = calloc(cnt, sizeof *queue);
+       if (dso==head && cnt <= countof(builtin_ctor_queue))
+               queue = builtin_ctor_queue;
+       else
+               queue = calloc(cnt, sizeof *queue);
 
        if (!queue) {
                error("Error allocating constructor queue: %m\n");
@@ -1416,6 +1421,7 @@ static struct dso **queue_ctors(struct dso *dso)
        /* Opposite ends of the allocated buffer serve as an output queue
         * and a working stack. Setup initial stack with just the argument
         * dso and initial queue empty... */
+       stack = queue;
        qpos = 0;
        spos = cnt;
        stack[--spos] = dso;
@@ -1455,7 +1461,6 @@ static void do_init_fini(struct dso **queue)
                        pthread_cond_wait(&ctor_cond, &init_fini_lock);
                if (p->ctor_visitor || p->constructed)
                        continue;
-               if (p->constructed) continue;
                p->ctor_visitor = self;
                
                decode_vec(p->dynv, dyn, DYN_CNT);
@@ -1487,7 +1492,8 @@ static void do_init_fini(struct dso **queue)
 void __libc_start_init(void)
 {
        do_init_fini(main_ctor_queue);
-       if (!__malloc_replaced) free(main_ctor_queue);
+       if (!__malloc_replaced && main_ctor_queue != builtin_ctor_queue)
+               free(main_ctor_queue);
        main_ctor_queue = 0;
 }
 
@@ -1679,6 +1685,8 @@ _Noreturn void __dls3(size_t *sp)
        libc.auxv = auxv = (void *)(argv+i+1);
        decode_vec(auxv, aux, AUX_CNT);
        __hwcap = aux[AT_HWCAP];
+       search_vec(auxv, &__sysinfo, AT_SYSINFO);
+       __pthread_self()->sysinfo = __sysinfo;
        libc.page_size = aux[AT_PAGESZ];
        libc.secure = ((aux[0]&0x7800)!=0x7800 || aux[AT_UID]!=aux[AT_EUID]
                || aux[AT_GID]!=aux[AT_EGID] || aux[AT_SECURE]);
@@ -1993,8 +2001,9 @@ void *dlopen(const char *file, int mode)
                        free(p->deps);
                        unmap_library(p);
                        free(p);
-                       free(ctor_queue);
                }
+               free(ctor_queue);
+               ctor_queue = 0;
                if (!orig_tls_tail) libc.tls_head = 0;
                tls_tail = orig_tls_tail;
                if (tls_tail) tls_tail->next = 0;