Reduce the statically linked startup code [BZ #23323]

It turns out the startup code in csu/elf-init.c has a perfect pair of
ROP gadgets (see Marco-Gisbert and Ripoll-Ripoll, "return-to-csu: A
New Method to Bypass 64-bit Linux ASLR").  These functions are not
needed in dynamically-linked binaries because DT_INIT/DT_INIT_ARRAY
are already processed by the dynamic linker.  However, the dynamic
linker skipped the main program for some reason.  For maximum
backwards compatibility, this is not changed, and instead, the main
map is consulted from __libc_start_main if the init function argument
is a NULL pointer.

For statically linked binaries, the old approach based on linker
symbols is still used because there is nothing else available.

A new symbol version __libc_start_main@@GLIBC_2.34 is introduced because
new binaries running on an old libc would not run their ELF
constructors, leading to difficult-to-debug issues.

58 files changed, 115 insertions, 182 deletions

diff --git a/sysdeps/aarch64/start.S b/sysdeps/aarch64/start.S
index 3761cbd..417da88 100644
--- a/sysdeps/aarch64/start.S
+++ b/sysdeps/aarch64/start.S
@@ -63,26 +63,16 @@ ENTRY(_start)
 # ifdef SHARED
         adrp    x0, :got:main
 	ldr     PTR_REG (0), [x0, #:got_lo12:main]
-
-        adrp    x3, :got:__libc_csu_init
-	ldr     PTR_REG (3), [x3, #:got_lo12:__libc_csu_init]
-
-        adrp    x4, :got:__libc_csu_fini
-	ldr     PTR_REG (4), [x4, #:got_lo12:__libc_csu_fini]
 # else
 	adrp	x0, __wrap_main
 	add	x0, x0, :lo12:__wrap_main
-	adrp	x3, __libc_csu_init
-	add	x3, x3, :lo12:__libc_csu_init
-	adrp	x4, __libc_csu_fini
-	add	x4, x4, :lo12:__libc_csu_fini
 # endif
 #else
 	/* Set up the other arguments in registers */
 	MOVL (0, main)
-	MOVL (3, __libc_csu_init)
-	MOVL (4, __libc_csu_fini)
 #endif
+	mov	x3, #0		/* Used to be init.  */
+	mov	x4, #0		/* Used to be fini.  */
 
 	/* __libc_start_main (main, argc, argv, init, fini, rtld_fini,
 			      stack_end) */
diff --git a/sysdeps/alpha/start.S b/sysdeps/alpha/start.S
index f3eb202..65dcd4d 100644
--- a/sysdeps/alpha/start.S
+++ b/sysdeps/alpha/start.S
@@ -55,9 +55,8 @@ _start:
 	ldl	a1, 16(sp)	/* get argc */
 	lda	a2, 24(sp)	/* get argv */
 
-  /* Load address of our own entry points to .fini and .init.  */
-	lda	a3, __libc_csu_init
-	lda	a4, __libc_csu_fini
+	mov	$r31, a3 	/* Used to be init.  */
+	mov	$r31, a4 	/* Used to be fini.  */
 
   /* Store address of the shared library termination function.  */
 	mov	v0, a5
diff --git a/sysdeps/arc/start.S b/sysdeps/arc/start.S
index dbec87e..5302a57 100644
--- a/sysdeps/arc/start.S
+++ b/sysdeps/arc/start.S
@@ -49,15 +49,14 @@ ENTRY (ENTRY_POINT)
 
 	/* __libc_start_main (main, argc, argv, init, fini, rtld_fini, stack_end).  */
 
+	mov_s	r3, 0 		/* Used to be init.  */
+	mov	r4, 0		/* Used to be fini.  */
+
 #ifdef SHARED
 	ld	r0, [pcl, @main@gotpc]
-	ld	r3, [pcl, @__libc_csu_init@gotpc]
-	ld	r4, [pcl, @__libc_csu_fini@gotpc]
 	bl	__libc_start_main@plt
 #else
 	mov_s	r0, main
-	mov_s	r3, __libc_csu_init
-	mov	r4, __libc_csu_fini
 	bl	__libc_start_main
 #endif
 
diff --git a/sysdeps/arm/start.S b/sysdeps/arm/start.S
index 30f69e1..9b56bc0 100644
--- a/sysdeps/arm/start.S
+++ b/sysdeps/arm/start.S
@@ -94,30 +94,20 @@ _start:
 	adr a4, .L_GOT
 	add sl, sl, a4
 
-	ldr ip, .L_GOT+4	/* __libc_csu_fini */
-	ldr ip, [sl, ip]
+	mov a4, #0		/* Used to be init.  */
+	push { a4 }		/* Used to be fini.  */
 
-	push { ip }		/* Push __libc_csu_fini */
-
-	ldr a4, .L_GOT+8	/* __libc_csu_init */
-	ldr a4, [sl, a4]
-
-	ldr a1, .L_GOT+12	/* main */
+	ldr a1, .L_GOT+4	/* main */
 	ldr a1, [sl, a1]
 
 	/* __libc_start_main (main, argc, argv, init, fini, rtld_fini, stack_end) */
 	/* Let the libc call main and exit with its return code.  */
 	bl __libc_start_main(PLT)
 #else
-	/* Fetch address of __libc_csu_fini */
-	ldr ip, =__libc_csu_fini
-
-	/* Push __libc_csu_fini */
-	push { ip }
 
-	/* Set up the other arguments in registers */
+	mov a4, #0		/* Used to init.  */
+	push { a4 }		/* Used to fini.  */
 	ldr a1, =main
-	ldr a4, =__libc_csu_init
 
 	/* __libc_start_main (main, argc, argv, init, fini, rtld_fini, stack_end) */
 	/* Let the libc call main and exit with its return code.  */
@@ -131,8 +121,6 @@ _start:
 	.align 2
 .L_GOT:
 	.word _GLOBAL_OFFSET_TABLE_ - .L_GOT
-	.word __libc_csu_fini(GOT)
-	.word __libc_csu_init(GOT)
 	.word main(GOT)
 #endif
 
diff --git a/sysdeps/csky/abiv2/start.S b/sysdeps/csky/abiv2/start.S
index d65e37e..a565cfa 100644
--- a/sysdeps/csky/abiv2/start.S
+++ b/sysdeps/csky/abiv2/start.S
@@ -66,13 +66,9 @@ _start:
 .Lgetpc:
 	lrw	gb, .Lgetpc@GOTPC
 	addu	gb, t0
-	lrw	a3, __libc_csu_fini@GOT
-	ldr.w	a3, (gb, a3 << 0)
-	stw	a3, (sp, 0)
 
-	lrw	a3, __libc_csu_init@GOT
-	addu	a3, gb
-	ldw	a3, (a3, 0)
+	movi	a3, 0		/* Used to be init.  */
+	stw 	a3, (sp, 0) 	/* Used to be fini.  */
 
 	lrw	t0, main@GOT
 	addu	t0, gb
@@ -85,14 +81,9 @@ _start:
 	ldr.w	t1, (gb, t1 << 0)
 	jsr	t1
 #else
-	/* Fetch address of __libc_csu_fini.  */
-	lrw	a0, __libc_csu_fini
-	/* Push __libc_csu_fini */
-	stw	a0, (sp, 0)
-
-	/* Set up the other arguments in registers.  */
+	movi	a3, 0		/* Used to be init.  */
+	stw 	a3, (sp, 0) 	/* Used to be fini.  */
 	lrw	a0, main
-	lrw	a3, __libc_csu_init
 	/* Let the libc call main and exit with its return code.  */
 	jsri	__libc_start_main
 
diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
index 9720a4e..ea3f7a6 100644
--- a/sysdeps/generic/ldsodefs.h
+++ b/sysdeps/generic/ldsodefs.h
@@ -93,6 +93,10 @@ typedef struct link_map *lookup_t;
    : (__glibc_unlikely ((ref)->st_shndx == SHN_ABS) ? 0			\
       : LOOKUP_VALUE_ADDRESS (map, map_set)) + (ref)->st_value)
 
+/* Type of a constructor function, in DT_INIT, DT_INIT_ARRAY,
+   DT_PREINIT_ARRAY.  */
+typedef void (*dl_init_t) (int, char **, char **);
+
 /* On some architectures a pointer to a function is not just a pointer
    to the actual code of the function but rather an architecture
    specific descriptor. */
@@ -101,7 +105,7 @@ typedef struct link_map *lookup_t;
  (void *) SYMBOL_ADDRESS (map, ref, false)
 # define DL_LOOKUP_ADDRESS(addr) ((ElfW(Addr)) (addr))
 # define DL_CALL_DT_INIT(map, start, argc, argv, env) \
- ((init_t) (start)) (argc, argv, env)
+ ((dl_init_t) (start)) (argc, argv, env)
 # define DL_CALL_DT_FINI(map, start) ((fini_t) (start)) ()
 #endif
 
diff --git a/sysdeps/hppa/dl-lookupcfg.h b/sysdeps/hppa/dl-lookupcfg.h
index 29d994b..a9a927f 100644
--- a/sysdeps/hppa/dl-lookupcfg.h
+++ b/sysdeps/hppa/dl-lookupcfg.h
@@ -56,7 +56,7 @@ void attribute_hidden _dl_unmap (struct link_map *map);
 {							\
   ElfW(Addr) addr;					\
   DL_DT_FUNCTION_ADDRESS(map, start, , addr)		\
-  init_t init = (init_t) addr; 				\
+  dl_init_t init = (dl_init_t) addr; 			\
   init (argc, argv, env);				\
 }
 
diff --git a/sysdeps/hppa/start.S b/sysdeps/hppa/start.S
index 2fe73c9..4a1877f 100644
--- a/sysdeps/hppa/start.S
+++ b/sysdeps/hppa/start.S
@@ -36,8 +36,6 @@
 	.import main, code
 	.import $global$, data
 	.import __libc_start_main, code
-	.import __libc_csu_fini, code
-	.import __libc_csu_init, code
 
 	/* Have the linker create plabel words so we get PLABEL32
 	   relocs and not 21/14.  The use of 21/14 relocs is only
@@ -52,10 +50,6 @@
 	.word P%main
 .Lp__libc_start_main:
 	.word P%__libc_start_main
-.Lp__libc_csu_fini:
-	.word P%__libc_csu_fini
-.Lp__libc_csu_init:
-	.word P%__libc_csu_init
 
 	.text
 	.align 4
@@ -77,8 +71,8 @@ _start:
 		1. r26 - Application main
 		2. r25 - argc
 		3. r24 - argv
-		4. r23 - __libc_csu_init
-		5. sp-52 - __libc_csu_fini
+		4. r23 - init (unused)
+		5. sp-52 - fini (unused)
 		6. sp-56 - rtld_fini
 		7. sp-60 - stackend  */
 
@@ -108,14 +102,6 @@ _start:
 	addil	LT'.Lpmain, %r19
 	ldw	RT'.Lpmain(%r1), %r26
 	ldw	0(%r26),%r26
-	/* void (*init) (void) (4th argument) */
-	addil	LT'.Lp__libc_csu_init, %r19
-	ldw	RT'.Lp__libc_csu_init(%r1), %r23
-	ldw	0(%r23), %r23
-	/* void (*fini) (void) (5th argument) */
-	addil	LT'.Lp__libc_csu_fini, %r19
-	ldw	RT'.Lp__libc_csu_fini(%r1), %r22
-	ldw	0(%r22), %r22
 #else
 	/* Load $global$ address into %dp */
 	ldil	L%$global$, %dp
@@ -124,13 +110,9 @@ _start:
 	/* load main (1st argument) */
 	ldil	LR'.Lpmain, %r26
 	ldw	RR'.Lpmain(%r26), %r26
-	/* void (*init) (void) (4th argument) */
-	ldil	LR'.Lp__libc_csu_init, %r23
-	ldw	RR'.Lp__libc_csu_init(%r23), %r23
-	/* void (*fini) (void) (5th argument) */
-	ldil	LR'.Lp__libc_csu_fini, %r22
-	ldw	RR'.Lp__libc_csu_fini(%r22), %r22
 #endif
+	ldi	0,%r23		/* Used to be init.  */
+	ldi	0,%r22		/* Used to be fini.  */
 	/* Store 5th argument */
 	stw	%r22, -52(%sp)
 	/* void *stack_end (7th argument) */
diff --git a/sysdeps/i386/start.S b/sysdeps/i386/start.S
index 24c806c..5296b27 100644
--- a/sysdeps/i386/start.S
+++ b/sysdeps/i386/start.S
@@ -87,11 +87,9 @@ ENTRY (_start)
 	call 1f
 	addl $_GLOBAL_OFFSET_TABLE_, %ebx
 
-	/* Push address of our own entry points to .fini and .init.  */
-	leal __libc_csu_fini@GOTOFF(%ebx), %eax
-	pushl %eax
-	leal __libc_csu_init@GOTOFF(%ebx), %eax
-	pushl %eax
+	/* This used to be the addresses of .fini and .init.  */
+	pushl $0
+	pushl $0
 
 	pushl %ecx		/* Push second argument: argv.  */
 	pushl %esi		/* Push first argument: argc.  */
@@ -112,9 +110,9 @@ ENTRY (_start)
 	   But let the libc call main.    */
 	call __libc_start_main@PLT
 #else
-	/* Push address of our own entry points to .fini and .init.  */
-	pushl $__libc_csu_fini
-	pushl $__libc_csu_init
+	/* This used to be the addresses of .fini and .init.  */
+	pushl $0
+	pushl $0
 
 	pushl %ecx		/* Push second argument: argv.  */
 	pushl %esi		/* Push first argument: argc.  */
diff --git a/sysdeps/ia64/dl-lookupcfg.h b/sysdeps/ia64/dl-lookupcfg.h
index 209d926..58ca324 100644
--- a/sysdeps/ia64/dl-lookupcfg.h
+++ b/sysdeps/ia64/dl-lookupcfg.h
@@ -50,7 +50,7 @@ extern void attribute_hidden _dl_unmap (struct link_map *map);
 {							\
   ElfW(Addr) addr;					\
   DL_DT_FUNCTION_ADDRESS(map, start, , addr)		\
-  init_t init = (init_t) addr; 				\
+  dl_init_t init = (dl_init_t) addr; 			\
   init (argc, argv, env);				\
 }
 
diff --git a/sysdeps/ia64/start.S b/sysdeps/ia64/start.S
index 0018acc..b28f8cb 100644
--- a/sysdeps/ia64/start.S
+++ b/sysdeps/ia64/start.S
@@ -82,20 +82,15 @@ _start:
 	{
 	  addl r11 = @ltoff(__libc_ia64_register_backing_store_base), gp
 	  addl out0 = @ltoff(@fptr(main)), gp
-	  addl out3 = @ltoff(@fptr(__libc_csu_init)), gp
+	  mov out3 = r0		/* Used to be init.  */
 	  ;;
 	}
 	{ .mmi
 	  ld8 r3 = [r11]	/* pointer to __libc_ia64_register_backing_store_base */
 	  ld8 out0 = [out0]	/* pointer to `main' function descriptor */
-	  addl out4 = @ltoff(@fptr(__libc_csu_fini)), gp
+	  mov out4 = r0		/* Used to be fini.  */
 	  ;;
 	}
-	{ .mmi
-	  ld8 out3 = [out3]	/* pointer to `init' function descriptor */
-	  ld8 out4 = [out4]	/* pointer to `fini' function descriptor */
-	  nop 0
-	}
 	.body
 	{ .mib
 	  st8 [r3] = r10
diff --git a/sysdeps/m68k/start.S b/sysdeps/m68k/start.S
index c36b34f..98da4db 100644
--- a/sysdeps/m68k/start.S
+++ b/sysdeps/m68k/start.S
@@ -76,15 +76,14 @@ _start:
 	pea (%a1)		/* Push address of the shared library
 				   termination function.  */
 
+	/* These used to be addresses of the .fini and .init entry points.  */
+	clr.l -(%sp)
+	clr.l -(%sp)
+
 #ifdef PIC
 	/* Load PIC register.  */
 	LOAD_GOT (%a5)
 
-	/* Push the address of our own entry points to `.fini' and
-	   `.init'.  */
-	move.l __libc_csu_fini@GOT(%a5), -(%sp)
-	move.l __libc_csu_init@GOT(%a5), -(%sp)
-
 	pea (%a0)		/* Push second argument: argv.  */
 	move.l %d0, -(%sp)	/* Push first argument: argc.  */
 
@@ -94,10 +93,6 @@ _start:
 	   let the libc call main.  */
 	jbsr __libc_start_main@PLTPC
 #else
-	/* Push the address of our own entry points to `.fini' and
-	   `.init'.  */
-	pea __libc_csu_fini
-	pea __libc_csu_init
 
 	pea (%a0)		/* Push second argument: argv.  */
 	move.l %d0, -(%sp)	/* Push first argument: argc.  */
diff --git a/sysdeps/mach/hurd/i386/libc.abilist b/sysdeps/mach/hurd/i386/libc.abilist
index 509e9b7..e10a286 100644
--- a/sysdeps/mach/hurd/i386/libc.abilist
+++ b/sysdeps/mach/hurd/i386/libc.abilist
@@ -2203,6 +2203,7 @@ GLIBC_2.33 mknod F
 GLIBC_2.33 mknodat F
 GLIBC_2.33 stat F
 GLIBC_2.33 stat64 F
+GLIBC_2.34 __libc_start_main F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F
diff --git a/sysdeps/microblaze/start.S b/sysdeps/microblaze/start.S
index dcb202a..6589bd4 100644
--- a/sysdeps/microblaze/start.S
+++ b/sysdeps/microblaze/start.S
@@ -63,14 +63,14 @@ _start:
     mfs     r20,rpc
     addik   r20,r20,_GLOBAL_OFFSET_TABLE_+8
     lwi     r5,r20,main@GOT
-    lwi     r8,r20,__libc_csu_init@GOT
-    lwi     r9,r20,__libc_csu_fini@GOT
+    addk    r8,r0,r0		/* Used to be init.  */
+    addk    r9,r0,r0		/* Used to be fini.  */
     brid    __libc_start_main@PLT
     addk    r10,r0,r0
 #else
     addik   r5,r0,main
-    addik   r8,r0,__libc_csu_init
-    addik   r9,r0,__libc_csu_fini
+    addk    r8,r0,r0		/* Used to be init.  */
+    addk    r9,r0,r0		/* Used to be fini.  */
     brid    __libc_start_main
     addk    r10,r0,r0
 #endif
diff --git a/sysdeps/mips/start.S b/sysdeps/mips/start.S
index 28e2ed1..4ec42a2 100644
--- a/sysdeps/mips/start.S
+++ b/sysdeps/mips/start.S
@@ -96,13 +96,13 @@ ENTRY_POINT:
 # if _MIPS_SIM == _ABIO32
 	PTR_SUBIU $29, 32
 # endif
-	PTR_LA $7, __libc_csu_init		/* init */
-	PTR_LA $8, __libc_csu_fini
+	move  $7, $0			/* Used to be init.  */
 # if _MIPS_SIM == _ABIO32
-	PTR_S $8, 16($29)		/* fini */
+	PTR_S $0, 16($29)		/* Used to be fini.  */
 	PTR_S $2, 20($29)		/* rtld_fini */
 	PTR_S $29, 24($29)		/* stack_end */
 # else
+	move $8, $0		/* Used to be fini.  */
 	move $9, $2		/* rtld_fini */
 	move $10, $29		/* stack_end */
 # endif
@@ -143,19 +143,17 @@ ENTRY_POINT:
 	/* Lay out last arguments, and call __libc_start_main().  */
 # ifdef __PIC__
 	sw	$7, 24($sp)			/* stack_end */
-	lw	$4, %got(__libc_csu_fini)($3)
-	lw	$7, %got(__libc_csu_init)($3)	/* init */
-	sw	$4, 16($sp)			/* fini */
+	move	$4, $0				/* Used to be ini.  */
+	sw	$0, 16($sp)			/* Used to be fini.  */
 	lw	$4, %got(main)($3)		/* main */
 	lw	$3, %call16(__libc_start_main)($3)
 	sw	$2, 20($sp)			/* rtld_fini */
 	move	$25, $3
 	jalr	$3
 # else
-	lw	$4, 1f
 	sw	$7, 24($sp)			/* stack_end */
-	lw	$7, 2f				/* init */
-	sw	$4, 16($sp)			/* fini */
+	move	$7, $0				/* Used to be init.  */
+	sw	$0, 16($sp)			/* Used to be fini.  */
 	lw	$4, 3f				/* main */
 	sw	$2, 20($sp)			/* rtld_fini */
 	/* Load and call __libc_start_main().  */
@@ -165,8 +163,6 @@ ENTRY_POINT:
 hlt:	b	hlt		/* Crash if somehow it does return.  */
 # ifndef __PIC__
 	.align	2
-1:	.word	__libc_csu_fini
-2:	.word	__libc_csu_init
 3:	.word	main
 4:	.word	__libc_start_main
 # endif
diff --git a/sysdeps/nios2/start.S b/sysdeps/nios2/start.S
index 0a6c587..7c96969 100644
--- a/sysdeps/nios2/start.S
+++ b/sysdeps/nios2/start.S
@@ -92,18 +92,11 @@ _start:
 	addi	r2, r2, %lo(_gp_got - 1b)
 	add	r22, r22, r2
 
-	/* Push fini */
-	movhi	r8, %call_hiadj(__libc_csu_fini)
-	addi	r8, r8, %call_lo(__libc_csu_fini)
-	add	r8, r8, r22
-	ldw	r8, 0(r8)
-	stw	r8, 0(sp)
-
-	/* r7 == init */
-	movhi	r7, %call_hiadj(__libc_csu_init)
-	addi	r7, r7, %call_lo(__libc_csu_init)
-	add	r7, r7, r22
-	ldw	r7, 0(r7)
+	/* Used to be fini.  */
+	stw	zero, 0(sp)
+
+	/* Used to be init.  */
+	mov	r7, zero
 
 	/* r6 == argv */
 	addi	r6, sp, 16
diff --git a/sysdeps/powerpc/powerpc32/start.S b/sysdeps/powerpc/powerpc32/start.S
index a721a18..39ce1a1 100644
--- a/sysdeps/powerpc/powerpc32/start.S
+++ b/sysdeps/powerpc/powerpc32/start.S
@@ -52,8 +52,8 @@
 L(start_addresses):
 	.long	_SDA_BASE_
 	.long	main
-	.long 	__libc_csu_init
-	.long 	__libc_csu_fini
+	.long 	0 /* Used to be init.  */
+	.long 	0 /* Used to be fini.  */
 	ASM_SIZE_DIRECTIVE(L(start_addresses))
 
 	.section ".text"
diff --git a/sysdeps/powerpc/powerpc64/start.S b/sysdeps/powerpc/powerpc64/start.S
index 612c846..71c0c67 100644
--- a/sysdeps/powerpc/powerpc64/start.S
+++ b/sysdeps/powerpc/powerpc64/start.S
@@ -53,8 +53,8 @@ L(start_addresses):
 	.quad	0 /* was _SDA_BASE_  but not in 64-bit ABI*/
 /*     function descriptors so don't need JUMPTARGET */
 	.quad	main
-	.quad 	__libc_csu_init
-	.quad 	__libc_csu_fini
+	.quad 	0 /* Used to be init.  */
+	.quad 	0 /* Used to be fini.  */
 
 	ASM_SIZE_DIRECTIVE(L(start_addresses))
 
diff --git a/sysdeps/riscv/start.S b/sysdeps/riscv/start.S
index 9c94035..806f6aa 100644
--- a/sysdeps/riscv/start.S
+++ b/sysdeps/riscv/start.S
@@ -54,8 +54,8 @@ ENTRY (ENTRY_POINT)
 	REG_L a1, 0(sp)      /* argc.  */
 	addi  a2, sp, SZREG  /* argv.  */
 	andi  sp, sp, ALMASK /* Align stack. */
-	lla   a3, __libc_csu_init
-	lla   a4, __libc_csu_fini
+	li    a3, 0	     /* Used to be init.  */
+	li    a4, 0	     /* Used to be fini.  */
 	mv    a6, sp  /* stack_end.  */
 
 	call  __libc_start_main@plt
diff --git a/sysdeps/s390/s390-32/start.S b/sysdeps/s390/s390-32/start.S
index aba9073..b6cfa4c 100644
--- a/sysdeps/s390/s390-32/start.S
+++ b/sysdeps/s390/s390-32/start.S
@@ -175,18 +175,16 @@ _start:
 	 */
 	stm     %r14,%r15,96(%r15)      # store rtld_fini/stack_end to parameter area
 	la      %r7,96(%r15)
-	l       %r6,.L2-.Llit(%r13)     # load pointer to __libc_csu_fini
-	l       %r5,.L1-.Llit(%r13)     # load pointer to __libc_csu_init
 	l       %r2,.L3-.Llit(%r13)     # load pointer to main
 	l       %r1,.L4-.Llit(%r13)	# load pointer to __libc_start_main
 #ifdef PIC
 	l       %r12,.L5-.Llit(%r13)    # load .got pointer
-	la	%r6,0(%r13,%r6)
-	la	%r5,0(%r13,%r5)
 	la	%r12,0(%r13,%r12)
 	l	%r2,0(%r12,%r2)
 	la	%r1,0(%r13,%r1)
 #endif
+	lhi	%r6, 0			# Used to fini.
+	lhi	%r5, 0			# Used to init.
 
 	/* ok, now branch to the libc main routine */
 	basr    %r14,%r1
@@ -197,13 +195,9 @@ _start:
 	cfi_endproc
 .Llit:
 #ifndef PIC
-.L1:    .long  __libc_csu_init
-.L2:    .long  __libc_csu_fini
 .L3:    .long  main
 .L4:    .long  __libc_start_main
 #else
-.L1:    .long  __libc_csu_init-.Llit
-.L2:    .long  __libc_csu_fini-.Llit
 .L3:    .long  main@GOT
 .L4:    .long  __libc_start_main@plt-.Llit
 .L5:    .long  _GLOBAL_OFFSET_TABLE_-.Llit
diff --git a/sysdeps/s390/s390-64/start.S b/sysdeps/s390/s390-64/start.S
index 0d9d309..4e65263 100644
--- a/sysdeps/s390/s390-64/start.S
+++ b/sysdeps/s390/s390-64/start.S
@@ -80,8 +80,8 @@ _start:
 	 */
 	stmg	%r14,%r15,160(%r15)	# store rtld_fini/stack_end to parameter area
 	la	%r7,160(%r15)
-	larl	%r6,__libc_csu_fini	# load pointer to __libc_csu_fini
-	larl	%r5,__libc_csu_init	# load pointer to __libc_csu_init
+	lghi	%r6,0			# Used to be fini.
+	lghi	%r5,0			# Used to be init.
 
 	/* Ok, now branch to the libc main routine.  */
 #ifdef PIC
diff --git a/sysdeps/sh/start.S b/sysdeps/sh/start.S
index ab29f19..606ee59 100644
--- a/sysdeps/sh/start.S
+++ b/sysdeps/sh/start.S
@@ -70,12 +70,11 @@ _start:
 
 	/* Push the last arguments to main() onto the stack */
 	mov.l r4,@-r15
-	mov.l L_fini,r0
-	mov.l r0,@-r15
+	mov.l r14,@-r15		/* Used to be fini.  */
 
 	/* Set up the other arguments for main() that go in registers */
 	mov.l L_main,r4
-	mov.l L_init,r7
+	mov #0,r7		/* Used to be init.  */
 
 	/* __libc_start_main (main, argc, argv, init, fini, rtld_fini) */
 
@@ -90,10 +89,6 @@ _start:
 	.align	2
 L_main:
 	.long	main
-L_init:
-	.long	__libc_csu_init
-L_fini:
-	.long	__libc_csu_fini
 L_libc_start_main:
 	.long	__libc_start_main
 L_abort:
diff --git a/sysdeps/sparc/sparc32/start.S b/sysdeps/sparc/sparc32/start.S
index 45ca77d..00bf898 100644
--- a/sysdeps/sparc/sparc32/start.S
+++ b/sysdeps/sparc/sparc32/start.S
@@ -59,22 +59,14 @@ _start:
   /* Load the addresses of the user entry points.  */
 #ifndef PIC
 	sethi	%hi(main), %o0
-	sethi	%hi(__libc_csu_init), %o3
-	sethi	%hi(__libc_csu_fini), %o4
 	or	%o0, %lo(main), %o0
-	or	%o3, %lo(__libc_csu_init), %o3
-	or	%o4, %lo(__libc_csu_fini), %o4
 #else
 	sethi	%gdop_hix22(main), %o0
-	sethi	%gdop_hix22(__libc_csu_init), %o3
-	sethi	%gdop_hix22(__libc_csu_fini), %o4
 	xor	%o0, %gdop_lox10(main), %o0
-	xor	%o3, %gdop_lox10(__libc_csu_init), %o3
-	xor	%o4, %gdop_lox10(__libc_csu_fini), %o4
 	ld	[%l7 + %o0], %o0, %gdop(main)
-	ld	[%l7 + %o3], %o3, %gdop(__libc_csu_init)
-	ld	[%l7 + %o4], %o4, %gdop(__libc_csu_fini)
 #endif
+	mov	0, %o3		/* Used to be init.  */
+	mov	0, %o4		/* Used to be fini.  */
 
   /* When starting a binary via the dynamic linker, %g1 contains the
      address of the shared library termination function, which will be
diff --git a/sysdeps/sparc/sparc64/start.S b/sysdeps/sparc/sparc64/start.S
index 210fbaf..8520717 100644
--- a/sysdeps/sparc/sparc64/start.S
+++ b/sysdeps/sparc/sparc64/start.S
@@ -60,22 +60,14 @@ _start:
   /* Load the addresses of the user entry points.  */
 #ifndef PIC
 	sethi	%hi(main), %o0
-	sethi	%hi(__libc_csu_init), %o3
-	sethi	%hi(__libc_csu_fini), %o4
 	or	%o0, %lo(main), %o0
-	or	%o3, %lo(__libc_csu_init), %o3
-	or	%o4, %lo(__libc_csu_fini), %o4
 #else
 	sethi	%gdop_hix22(main), %o0
-	sethi	%gdop_hix22(__libc_csu_init), %o3
-	sethi	%gdop_hix22(__libc_csu_fini), %o4
 	xor	%o0, %gdop_lox10(main), %o0
-	xor	%o3, %gdop_lox10(__libc_csu_init), %o3
-	xor	%o4, %gdop_lox10(__libc_csu_fini), %o4
 	ldx	[%l7 + %o0], %o0, %gdop(main)
-	ldx	[%l7 + %o3], %o3, %gdop(__libc_csu_init)
-	ldx	[%l7 + %o4], %o4, %gdop(__libc_csu_fini)
 #endif
+	mov	0, %o3		/* Used to be init.  */
+	mov	0, %o4		/* Used to be fini.  */
 
   /* When starting a binary via the dynamic linker, %g1 contains the
      address of the shared library termination function, which will be
diff --git a/sysdeps/unix/sysv/linux/aarch64/libc.abilist b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
index 4cc1c6a..bac7952 100644
--- a/sysdeps/unix/sysv/linux/aarch64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
@@ -2171,3 +2171,4 @@ GLIBC_2.33 mknod F
 GLIBC_2.33 mknodat F
 GLIBC_2.33 stat F
 GLIBC_2.33 stat64 F
+GLIBC_2.34 __libc_start_main F
diff --git a/sysdeps/unix/sysv/linux/alpha/libc.abilist b/sysdeps/unix/sysv/linux/alpha/libc.abilist
index 26ad984..897f70d 100644
--- a/sysdeps/unix/sysv/linux/alpha/libc.abilist
+++ b/sysdeps/unix/sysv/linux/alpha/libc.abilist
@@ -2253,6 +2253,7 @@ GLIBC_2.33 mknod F
 GLIBC_2.33 mknodat F
 GLIBC_2.33 stat F
 GLIBC_2.33 stat64 F
+GLIBC_2.34 __libc_start_main F
 GLIBC_2.4 _IO_fprintf F
 GLIBC_2.4 _IO_printf F
 GLIBC_2.4 _IO_sprintf F
diff --git a/sysdeps/unix/sysv/linux/arc/libc.abilist b/sysdeps/unix/sysv/linux/arc/libc.abilist
index bb9dfd4..604d259 100644
--- a/sysdeps/unix/sysv/linux/arc/libc.abilist
+++ b/sysdeps/unix/sysv/linux/arc/libc.abilist
@@ -1931,3 +1931,4 @@ GLIBC_2.33 mknod F
 GLIBC_2.33 mknodat F
 GLIBC_2.33 stat F
 GLIBC_2.33 stat64 F
+GLIBC_2.34 __libc_start_main F
diff --git a/sysdeps/unix/sysv/linux/arm/be/libc.abilist b/sysdeps/unix/sysv/linux/arm/be/libc.abilist
index 3b0a47e..094236f 100644
--- a/sysdeps/unix/sysv/linux/arm/be/libc.abilist
+++ b/sysdeps/unix/sysv/linux/arm/be/libc.abilist
@@ -155,6 +155,7 @@ GLIBC_2.33 mknod F
 GLIBC_2.33 mknodat F
 GLIBC_2.33 stat F
 GLIBC_2.33 stat64 F
+GLIBC_2.34 __libc_start_main F
 GLIBC_2.4 _Exit F
 GLIBC_2.4 _IO_2_1_stderr_ D 0xa0
 GLIBC_2.4 _IO_2_1_stdin_ D 0xa0
diff --git a/sysdeps/unix/sysv/linux/arm/le/libc.abilist b/sysdeps/unix/sysv/linux/arm/le/libc.abilist
index 9ab3924..2bb4d31 100644
--- a/sysdeps/unix/sysv/linux/arm/le/libc.abilist
+++ b/sysdeps/unix/sysv/linux/arm/le/libc.abilist
@@ -152,6 +152,7 @@ GLIBC_2.33 mknod F
 GLIBC_2.33 mknodat F
 GLIBC_2.33 stat F
 GLIBC_2.33 stat64 F
+GLIBC_2.34 __libc_start_main F
 GLIBC_2.4 _Exit F
 GLIBC_2.4 _IO_2_1_stderr_ D 0xa0
 GLIBC_2.4 _IO_2_1_stdin_ D 0xa0
diff --git a/sysdeps/unix/sysv/linux/csky/libc.abilist b/sysdeps/unix/sysv/linux/csky/libc.abilist
index 14a84da..d4291fe 100644
--- a/sysdeps/unix/sysv/linux/csky/libc.abilist
+++ b/sysdeps/unix/sysv/linux/csky/libc.abilist
@@ -2115,3 +2115,4 @@ GLIBC_2.33 mknod F
 GLIBC_2.33 mknodat F
 GLIBC_2.33 stat F
 GLIBC_2.33 stat64 F
+GLIBC_2.34 __libc_start_main F
diff --git a/sysdeps/unix/sysv/linux/hppa/libc.abilist b/sysdeps/unix/sysv/linux/hppa/libc.abilist
index 5c8502f..1fd2a86 100644
--- a/sysdeps/unix/sysv/linux/hppa/libc.abilist
+++ b/sysdeps/unix/sysv/linux/hppa/libc.abilist
@@ -2074,6 +2074,7 @@ GLIBC_2.33 mknod F
 GLIBC_2.33 mknodat F
 GLIBC_2.33 stat F
 GLIBC_2.33 stat64 F
+GLIBC_2.34 __libc_start_main F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F
diff --git a/sysdeps/unix/sysv/linux/i386/libc.abilist b/sysdeps/unix/sysv/linux/i386/libc.abilist
index ddc5837..943331f 100644
--- a/sysdeps/unix/sysv/linux/i386/libc.abilist
+++ b/sysdeps/unix/sysv/linux/i386/libc.abilist
@@ -2241,6 +2241,7 @@ GLIBC_2.33 mknod F
 GLIBC_2.33 mknodat F
 GLIBC_2.33 stat F
 GLIBC_2.33 stat64 F
+GLIBC_2.34 __libc_start_main F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F
diff --git a/sysdeps/unix/sysv/linux/ia64/libc.abilist b/sysdeps/unix/sysv/linux/ia64/libc.abilist
index e3b345b..f530151 100644
--- a/sysdeps/unix/sysv/linux/ia64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/ia64/libc.abilist
@@ -2106,6 +2106,7 @@ GLIBC_2.33 mknod F
 GLIBC_2.33 mknodat F
 GLIBC_2.33 stat F
 GLIBC_2.33 stat64 F
+GLIBC_2.34 __libc_start_main F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F
diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
index 25f2d1c..6e76b6d 100644
--- a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
+++ b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
@@ -156,6 +156,7 @@ GLIBC_2.33 mknod F
 GLIBC_2.33 mknodat F
 GLIBC_2.33 stat F
 GLIBC_2.33 stat64 F
+GLIBC_2.34 __libc_start_main F
 GLIBC_2.4 _Exit F
 GLIBC_2.4 _IO_2_1_stderr_ D 0x98
 GLIBC_2.4 _IO_2_1_stdin_ D 0x98
diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
index c489147..7541b82 100644
--- a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
+++ b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
@@ -2186,6 +2186,7 @@ GLIBC_2.33 mknod F
 GLIBC_2.33 mknodat F
 GLIBC_2.33 stat F
 GLIBC_2.33 stat64 F
+GLIBC_2.34 __libc_start_main F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F
diff --git a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
index 143b016..6cf1936 100644
--- a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
+++ b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
@@ -2166,3 +2166,4 @@ GLIBC_2.33 mknod F
 GLIBC_2.33 mknodat F
 GLIBC_2.33 stat F
 GLIBC_2.33 stat64 F
+GLIBC_2.34 __libc_start_main F
diff --git a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
index 13d374a..98730eb 100644
--- a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
+++ b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
@@ -2163,3 +2163,4 @@ GLIBC_2.33 mknod F
 GLIBC_2.33 mknodat F
 GLIBC_2.33 stat F
 GLIBC_2.33 stat64 F
+GLIBC_2.34 __libc_start_main F
diff --git a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
index b2295f1..92fa6cb 100644
--- a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
@@ -2157,6 +2157,7 @@ GLIBC_2.33 mknod F
 GLIBC_2.33 mknodat F
 GLIBC_2.33 stat F
 GLIBC_2.33 stat64 F
+GLIBC_2.34 __libc_start_main F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F
diff --git a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
index 4c78607..265a49e 100644
--- a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
@@ -2155,6 +2155,7 @@ GLIBC_2.33 mknod F
 GLIBC_2.33 mknodat F
 GLIBC_2.33 stat F
 GLIBC_2.33 stat64 F
+GLIBC_2.34 __libc_start_main F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F
diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
index aa9c6a4..cfa5e11 100644
--- a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
@@ -2163,6 +2163,7 @@ GLIBC_2.33 mknod F
 GLIBC_2.33 mknodat F
 GLIBC_2.33 stat F
 GLIBC_2.33 stat64 F
+GLIBC_2.34 __libc_start_main F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F
diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
index 5939588..8c03ac5 100644
--- a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
@@ -2157,6 +2157,7 @@ GLIBC_2.33 mknod F
 GLIBC_2.33 mknodat F
 GLIBC_2.33 stat F
 GLIBC_2.33 stat64 F
+GLIBC_2.34 __libc_start_main F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F
diff --git a/sysdeps/unix/sysv/linux/nios2/libc.abilist b/sysdeps/unix/sysv/linux/nios2/libc.abilist
index 92556c4..17f5609 100644
--- a/sysdeps/unix/sysv/linux/nios2/libc.abilist
+++ b/sysdeps/unix/sysv/linux/nios2/libc.abilist
@@ -2204,3 +2204,4 @@ GLIBC_2.33 mknod F
 GLIBC_2.33 mknodat F
 GLIBC_2.33 stat F
 GLIBC_2.33 stat64 F
+GLIBC_2.34 __libc_start_main F
diff --git a/sysdeps/unix/sysv/linux/powerpc/libc-start.c b/sysdeps/unix/sysv/linux/powerpc/libc-start.c
index 66f5eff..4d681da 100644
--- a/sysdeps/unix/sysv/linux/powerpc/libc-start.c
+++ b/sysdeps/unix/sysv/linux/powerpc/libc-start.c
@@ -41,12 +41,12 @@ struct startup_info
   };
 
 int
-__libc_start_main (int argc, char **argv,
-		   char **ev,
-		   ElfW (auxv_t) * auxvec,
-		   void (*rtld_fini) (void),
-		   struct startup_info *stinfo,
-		   char **stack_on_entry)
+__libc_start_main_impl (int argc, char **argv,
+			char **ev,
+			ElfW (auxv_t) * auxvec,
+			void (*rtld_fini) (void),
+			struct startup_info *stinfo,
+			char **stack_on_entry)
 {
   /* the PPC SVR4 ABI says that the top thing on the stack will
      be a NULL pointer, so if not we assume that we're being called
@@ -99,3 +99,4 @@ __libc_start_main (int argc, char **argv,
 			     stinfo->init, stinfo->fini, rtld_fini,
 			     stack_on_entry);
 }
+DEFINE_LIBC_START_MAIN_VERSION
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
index 26c93df..76a16e2 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
@@ -2213,6 +2213,7 @@ GLIBC_2.33 mknod F
 GLIBC_2.33 mknodat F
 GLIBC_2.33 stat F
 GLIBC_2.33 stat64 F
+GLIBC_2.34 __libc_start_main F
 GLIBC_2.4 _IO_fprintf F
 GLIBC_2.4 _IO_printf F
 GLIBC_2.4 _IO_sprintf F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
index f04b167..697f072 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
@@ -2246,6 +2246,7 @@ GLIBC_2.33 mknod F
 GLIBC_2.33 mknodat F
 GLIBC_2.33 stat F
 GLIBC_2.33 stat64 F
+GLIBC_2.34 __libc_start_main F
 GLIBC_2.4 _IO_fprintf F
 GLIBC_2.4 _IO_printf F
 GLIBC_2.4 _IO_sprintf F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
index c2ca007..2647bb5 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
@@ -2076,6 +2076,7 @@ GLIBC_2.33 mknod F
 GLIBC_2.33 mknodat F
 GLIBC_2.33 stat F
 GLIBC_2.33 stat64 F
+GLIBC_2.34 __libc_start_main F
 GLIBC_2.4 _IO_fprintf F
 GLIBC_2.4 _IO_printf F
 GLIBC_2.4 _IO_sprintf F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
index 0ea50dc..036b1c8 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
@@ -2366,3 +2366,4 @@ GLIBC_2.33 mknod F
 GLIBC_2.33 mknodat F
 GLIBC_2.33 stat F
 GLIBC_2.33 stat64 F
+GLIBC_2.34 __libc_start_main F
diff --git a/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
index 0263e28..ff3225e 100644
--- a/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
@@ -1933,3 +1933,4 @@ GLIBC_2.33 wprintf F
 GLIBC_2.33 write F
 GLIBC_2.33 writev F
 GLIBC_2.33 wscanf F
+GLIBC_2.34 __libc_start_main F
diff --git a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
index 1626c53..fb5ad99 100644
--- a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
@@ -2133,3 +2133,4 @@ GLIBC_2.33 mknod F
 GLIBC_2.33 mknodat F
 GLIBC_2.33 stat F
 GLIBC_2.33 stat64 F
+GLIBC_2.34 __libc_start_main F
diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
index a66426e..cead75a 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
@@ -2211,6 +2211,7 @@ GLIBC_2.33 mknod F
 GLIBC_2.33 mknodat F
 GLIBC_2.33 stat F
 GLIBC_2.33 stat64 F
+GLIBC_2.34 __libc_start_main F
 GLIBC_2.4 _IO_fprintf F
 GLIBC_2.4 _IO_printf F
 GLIBC_2.4 _IO_sprintf F
diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
index ab35187..31366dd 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
@@ -2112,6 +2112,7 @@ GLIBC_2.33 mknod F
 GLIBC_2.33 mknodat F
 GLIBC_2.33 stat F
 GLIBC_2.33 stat64 F
+GLIBC_2.34 __libc_start_main F
 GLIBC_2.4 _IO_fprintf F
 GLIBC_2.4 _IO_printf F
 GLIBC_2.4 _IO_sprintf F
diff --git a/sysdeps/unix/sysv/linux/sh/be/libc.abilist b/sysdeps/unix/sysv/linux/sh/be/libc.abilist
index 22ceaa3..a3a8be8 100644
--- a/sysdeps/unix/sysv/linux/sh/be/libc.abilist
+++ b/sysdeps/unix/sysv/linux/sh/be/libc.abilist
@@ -2081,6 +2081,7 @@ GLIBC_2.33 mknod F
 GLIBC_2.33 mknodat F
 GLIBC_2.33 stat F
 GLIBC_2.33 stat64 F
+GLIBC_2.34 __libc_start_main F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F
diff --git a/sysdeps/unix/sysv/linux/sh/le/libc.abilist b/sysdeps/unix/sysv/linux/sh/le/libc.abilist
index d36f228..8f505c5 100644
--- a/sysdeps/unix/sysv/linux/sh/le/libc.abilist
+++ b/sysdeps/unix/sysv/linux/sh/le/libc.abilist
@@ -2078,6 +2078,7 @@ GLIBC_2.33 mknod F
 GLIBC_2.33 mknodat F
 GLIBC_2.33 stat F
 GLIBC_2.33 stat64 F
+GLIBC_2.34 __libc_start_main F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
index 59b4313..53ef630 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
@@ -2202,6 +2202,7 @@ GLIBC_2.33 mknod F
 GLIBC_2.33 mknodat F
 GLIBC_2.33 stat F
 GLIBC_2.33 stat64 F
+GLIBC_2.34 __libc_start_main F
 GLIBC_2.4 _IO_fprintf F
 GLIBC_2.4 _IO_printf F
 GLIBC_2.4 _IO_sprintf F
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
index 266dcdf..eba0cb1 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
@@ -2129,6 +2129,7 @@ GLIBC_2.33 mknod F
 GLIBC_2.33 mknodat F
 GLIBC_2.33 stat F
 GLIBC_2.33 stat64 F
+GLIBC_2.34 __libc_start_main F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F
diff --git a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
index 2744bba..17ce5df 100644
--- a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
@@ -2088,6 +2088,7 @@ GLIBC_2.33 mknod F
 GLIBC_2.33 mknodat F
 GLIBC_2.33 stat F
 GLIBC_2.33 stat64 F
+GLIBC_2.34 __libc_start_main F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F
diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
index ce2f4fb..17a1c83 100644
--- a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
@@ -2185,3 +2185,4 @@ GLIBC_2.33 mknod F
 GLIBC_2.33 mknodat F
 GLIBC_2.33 stat F
 GLIBC_2.33 stat64 F
+GLIBC_2.34 __libc_start_main F
diff --git a/sysdeps/x86_64/start.S b/sysdeps/x86_64/start.S
index 30fc900..1b3e368 100644
--- a/sysdeps/x86_64/start.S
+++ b/sysdeps/x86_64/start.S
@@ -96,17 +96,13 @@ ENTRY (_start)
 	   which grow downwards).  */
 	pushq %rsp
 
-#ifdef PIC
-	/* Pass address of our own entry points to .fini and .init.  */
-	mov __libc_csu_fini@GOTPCREL(%rip), %R8_LP
-	mov __libc_csu_init@GOTPCREL(%rip), %RCX_LP
+	/* These used to be the addresses of .fini and .init.  */
+	xorl %r8d, %r8d
+	xorl %ecx, %ecx
 
+#ifdef PIC
 	mov main@GOTPCREL(%rip), %RDI_LP
 #else
-	/* Pass address of our own entry points to .fini and .init.  */
-	mov $__libc_csu_fini, %R8_LP
-	mov $__libc_csu_init, %RCX_LP
-
 	mov $main, %RDI_LP
 #endif