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authorWaldemar Brodkorb <wbx@openadk.org>2017-05-24 20:49:02 +0200
committerWaldemar Brodkorb <wbx@openadk.org>2017-06-23 23:46:04 +0200
commit041cdc2769407c4d3869b218ad7ee7638e1c306e (patch)
tree1ea25250d74dcb230cf5feee99226fc080dbd678 /libc/sysdeps/linux/sparc64/crt1.S
parent58a5ba12bffad5916d9897c2870fc483f1db8282 (diff)
sparc64: add basic support
No NPTL, no LDSO support. Bootup with Busybox Ash in Qemu working. Testuite shows only two failures, but mksh continue/break support doesn't work.
Diffstat (limited to 'libc/sysdeps/linux/sparc64/crt1.S')
-rw-r--r--libc/sysdeps/linux/sparc64/crt1.S116
1 files changed, 116 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/sparc64/crt1.S b/libc/sysdeps/linux/sparc64/crt1.S
new file mode 100644
index 000000000..55e0dea08
--- /dev/null
+++ b/libc/sysdeps/linux/sparc64/crt1.S
@@ -0,0 +1,116 @@
+/* Startup code for elf64-sparc
+ Copyright (C) 1997-2017 Free Software Foundation, Inc.
+ Contributed by Richard Henderson <richard@gnu.ai.mit.edu>, 1997.
+
+ 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
+ <http://www.gnu.org/licenses/>. */
+
+#include <features.h>
+#include <sysdep.h>
+
+.text
+.align 4
+.global _start
+.type _start,%function
+#if defined(__UCLIBC_CTOR_DTOR__)
+.type _init,%function
+.type _fini,%function
+#else
+.weak _init
+.weak _fini
+#endif
+.type __uClibc_main,%function
+/* Stick in a dummy reference to main(), so that if an application
+ * is linking when the main() function is in a static library (.a)
+ * we can be sure that main() actually gets linked in */
+.global main
+.type main,%function
+
+#ifdef __PIC__
+.LLGETPC0:
+ retl
+ add %o7, %l7, %l7
+#endif
+
+_start:
+#ifdef __PIC__
+ sethi %hi(_GLOBAL_OFFSET_TABLE_-4), %l7
+ call .LLGETPC0
+ add %l7, %lo(_GLOBAL_OFFSET_TABLE_+4), %l7
+#endif
+
+ /* Terminate the stack frame, and reserve space for functions to
+ * drop their arguments. */
+ mov %g0, %fp
+ sub %sp, 6*8, %sp
+
+ /* Extract the arguments and environment as encoded on the stack. The
+ argument info starts after one register window (16 words) past the SP,
+ plus the bias we added, plus the magic v9 STACK_BIAS. */
+ ldx [%sp+STACK_BIAS+22*8], %o1 /* %o1 = argc */
+ add %sp, STACK_BIAS+23*8, %o2 /* %o2 = argv */
+
+ /* Load the addresses of the user entry points. */
+ sethi %hi(main), %o0
+ sethi %hi(_init), %o3
+ sethi %hi(_fini), %o4
+ or %o0, %lo(main), %o0
+ or %o3, %lo(_init), %o3
+ or %o4, %lo(_fini), %o4
+#ifdef __PIC__
+ /* Need a little more magic when building PIC to get addr of main */
+ LD [%l7 + %o0], %o0
+ LD [%l7 + %o3], %o3
+ LD [%l7 + %o4], %o4
+#endif
+
+ /* When starting a binary via the dynamic linker, %g1 contains the
+ * address of the shared library termination function, which will be
+ * registered with atexit(). If we are statically linked, this will
+ * be NULL. */
+ mov %g1, %o5
+
+ /* Let libc do the rest of the initialization, and call main. */
+ call __uClibc_main
+ nop
+
+ /* Die very horribly if exit returns. */
+ unimp
+
+.size _start,.-_start
+
+/* Define a symbol for the first piece of initialized data. */
+.data
+.global __data_start
+__data_start:
+.long 0
+.weak data_start
+ data_start = __data_start