Merge pull request #21195 from alexrp/glibc-fixes

`glibc`: Some bug fixes, plus arc and csky start files

lib/libc/glibc/sysdeps/arc/bits/endianness.h

@@ -0,0 +1,15 @@
+#ifndef _BITS_ENDIANNESS_H
+#define _BITS_ENDIANNESS_H 1
+
+#ifndef _BITS_ENDIAN_H
+# error "Never use <bits/endian.h> directly; include <endian.h> instead."
+#endif
+
+/* ARC has selectable endianness.  */
+#ifdef __BIG_ENDIAN__
+# define __BYTE_ORDER __BIG_ENDIAN
+#else
+# define __BYTE_ORDER __LITTLE_ENDIAN
+#endif
+
+#endif /* bits/endianness.h */

lib/libc/glibc/sysdeps/arc/entry.h

@@ -0,0 +1,5 @@
+#ifndef __ASSEMBLY__
+extern void __start (void) attribute_hidden;
+#endif
+
+#define ENTRY_POINT __start

lib/libc/glibc/sysdeps/arc/start-2.33.S

@@ -0,0 +1,74 @@
+/* Startup code for ARC.
+   Copyright (C) 2020-2021 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library.  If not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#define __ASSEMBLY__ 1
+#include <entry.h>
+#include <sysdep.h>
+
+#ifndef ENTRY_POINT
+# error ENTRY_POINT needs to be defined for ARC
+#endif
+
+/* When we enter this piece of code, the program stack looks like this:
+        argc            argument counter (integer)
+        argv[0]         program name (pointer)
+        argv[1...N]     program args (pointers)
+        argv[argc-1]    end of args (integer)
+        NULL
+        env[0...N]      environment variables (pointers)
+        NULL.  */
+
+ENTRY (ENTRY_POINT)
+
+	/* Needed to make gdb backtraces stop here.  */
+	.cfi_label .Ldummy
+	cfi_undefined (blink)
+
+	mov	fp, 0
+	ld_s	r1, [sp]	/* argc.  */
+
+	mov_s	r5, r0		/* rltd_fini.  */
+	add_s	r2, sp, 4	/* argv.  */
+	and	sp, sp, -8
+	mov	r6, sp
+
+	/* __libc_start_main (main, argc, argv, init, fini, rtld_fini, stack_end).  */
+
+#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
+
+	/* Should never get here.  */
+	flag    1
+END (ENTRY_POINT)
+
+/* Define a symbol for the first piece of initialized data.  */
+	.data
+	.globl __data_start
+__data_start:
+	.long 0
+	.weak data_start
+	data_start = __data_start

lib/libc/glibc/sysdeps/arc/start.S

@@ -0,0 +1,90 @@
+/* Startup code for ARC.
+   Copyright (C) 2020-2024 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   In addition to the permissions in the GNU Lesser General Public
+   License, the Free Software Foundation gives you unlimited
+   permission to link the compiled version of this file with other
+   programs, and to distribute those programs without any restriction
+   coming from the use of this file. (The GNU Lesser General Public
+   License restrictions do apply in other respects; for example, they
+   cover modification of the file, and distribution when not linked
+   into another program.)
+
+   Note that people who make modified versions of this file are not
+   obligated to grant this special exception for their modified
+   versions; it is their choice whether to do so. The GNU Lesser
+   General Public License gives permission to release a modified
+   version without this exception; this exception also makes it
+   possible to release a modified version which carries forward this
+   exception.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#define __ASSEMBLY__ 1
+#include <entry.h>
+#include <sysdep.h>
+
+#ifndef ENTRY_POINT
+# error ENTRY_POINT needs to be defined for ARC
+#endif
+
+/* When we enter this piece of code, the program stack looks like this:
+        argc            argument counter (integer)
+        argv[0]         program name (pointer)
+        argv[1...N]     program args (pointers)
+        argv[argc-1]    end of args (integer)
+        NULL
+        env[0...N]      environment variables (pointers)
+        NULL.  */
+
+ENTRY (ENTRY_POINT)
+
+	/* Needed to make gdb backtraces stop here.  */
+	.cfi_label .Ldummy
+	cfi_undefined (blink)
+
+	mov	fp, 0
+	ld_s	r1, [sp]	/* argc.  */
+
+	mov_s	r5, r0		/* rltd_fini.  */
+	add_s	r2, sp, 4	/* argv.  */
+	and	sp, sp, -8
+	mov	r6, sp
+
+	/* __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]
+	bl	__libc_start_main@plt
+#else
+	mov_s	r0, main
+	bl	__libc_start_main
+#endif
+
+	/* Should never get here.  */
+	flag    1
+END (ENTRY_POINT)
+
+/* Define a symbol for the first piece of initialized data.  */
+	.data
+	.globl __data_start
+__data_start:
+	.long 0
+	.weak data_start
+	data_start = __data_start

lib/libc/glibc/sysdeps/csky/abiv2/start-2.33.S

@@ -0,0 +1,112 @@
+/* Startup code compliant to the ELF C-SKY ABIV2.
+   Copyright (C) 2018-2021 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   In addition to the permissions in the GNU Lesser General Public
+   License, the Free Software Foundation gives you unlimited
+   permission to link the compiled version of this file with other
+   programs, and to distribute those programs without any restriction
+   coming from the use of this file. (The GNU Lesser General Public
+   License restrictions do apply in other respects; for example, they
+   cover modification of the file, and distribution when not linked
+   into another program.)
+
+   Note that people who make modified versions of this file are not
+   obligated to grant this special exception for their modified
+   versions; it is their choice whether to do so. The GNU Lesser
+   General Public License gives permission to release a modified
+   version without this exception; this exception also makes it
+   possible to release a modified version which carries forward this
+   exception.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library.  If not, see
+   <https://www.gnu.org/licenses/>.  */
+
+/* We need to call:
+   __libc_start_main (int (*main) (int, char **, char **), int argc,
+		      char **argv, void (*init) (void), void (*fini) (void),
+		      void (*rtld_fini) (void), void *stack_end)
+ */
+
+#include <sysdep.h>
+
+	.text
+	.globl _start;
+	.type _start,@function;
+	.align 4;
+_start:
+	cfi_startproc
+	.cfi_label .Ldummy
+	cfi_undefined (lr)
+	subi	sp, 8
+	/* Clear the link register since this is the outermost frame.  */
+	movi	lr, 0
+	/* Pop argc off the stack and save a pointer to argv.  */
+	ldw	a1, (sp, 8)	/* Init argc for __libc_start_main.  */
+	addi	a2, sp, 12	/* Init argv for __libc_start_main.  */
+
+	/* Push stack limit.  */
+	stw	a2, (sp, 8)
+	/* Push rtld_fini.  */
+	stw	a0, (sp, 4)
+
+#ifdef SHARED
+	grs	t0, .Lgetpc
+.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)
+
+	lrw	t0, main@GOT
+	addu	t0, gb
+	ldw	a0, (t0, 0)
+	lrw	t1, __libc_start_main@PLT
+	ldr.w	t1, (gb, t1 << 0)
+	jsr	t1
+
+	lrw	t1, abort@PLT
+	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.  */
+	lrw	a0, main
+	lrw	a3, __libc_csu_init
+	/* Let the libc call main and exit with its return code.  */
+	jsri	__libc_start_main
+
+	/* Should never get here.  */
+	jsri	abort
+#endif	/* !SHARED */
+	cfi_endproc
+	.size _start,.-_start
+
+
+	/* Define a symbol for the first piece of initialized data.  */
+	.data
+	.globl __data_start
+__data_start:
+	.long 0
+	.weak data_start
+	data_start = __data_start