[PATCH 3/7] add AVR32 support to libc
Hans-Christian Egtvedt
hcegtvedt at atmel.com
Mon Nov 5 23:50:06 PST 2007
This patch adds AVR32 support to libc.
Signed-off-by: Hans-Christian Egtvedt <hcegtvedt at atmel.com>
---
diff --git a/libc/sysdeps/linux/avr32/Makefile b/libc/sysdeps/linux/avr32/Makefile
new file mode 100644
index 0000000..338abc0
--- /dev/null
+++ b/libc/sysdeps/linux/avr32/Makefile
@@ -0,0 +1,25 @@
+# Makefile for uClibc
+#
+# Copyright (C) 2000-2003 Erik Andersen <andersen at uclibc.org>
+#
+# This program is free software; you can redistribute it and/or modify it under
+# the terms of the GNU Library General Public License as published by the Free
+# Software Foundation; either version 2 of the License, or (at your option) any
+# later version.
+#
+# This program 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 Library General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Library General Public License
+# along with this program; if not, write to the Free Software Foundation, Inc.,
+# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+top_srcdir=../../../../
+top_builddir=../../../../
+all: objs
+
+include $(top_builddir)Rules.mak
+include Makefile.arch
+include $(top_srcdir)Makerules
diff --git a/libc/sysdeps/linux/avr32/Makefile.arch b/libc/sysdeps/linux/avr32/Makefile.arch
new file mode 100644
index 0000000..44fc01e
--- /dev/null
+++ b/libc/sysdeps/linux/avr32/Makefile.arch
@@ -0,0 +1,13 @@
+# Makefile for uClibc
+#
+# Copyright (C) 2000-2005 Erik Andersen <andersen at uclibc.org>
+#
+# Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+#
+
+CSRC := brk.c clone.c mmap.c sigaction.c
+
+SSRC := __longjmp.S setjmp.S bsd-setjmp.S bsd-_setjmp.S \
+ sigrestorer.S syscall.S vfork.S
+
+include $(top_srcdir)/libc/sysdeps/linux/Makefile.commonarch
diff --git a/libc/sysdeps/linux/avr32/__longjmp.S b/libc/sysdeps/linux/avr32/__longjmp.S
new file mode 100644
index 0000000..6154bb2
--- /dev/null
+++ b/libc/sysdeps/linux/avr32/__longjmp.S
@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2004-2007 Atmel Corporation
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser General
+ * Public License. See the file "COPYING.LIB" in the main directory of this
+ * archive for more details.
+ */
+
+ .global __longjmp
+ .type __longjmp,"function"
+ .align 1
+__longjmp:
+ ldm r12++, r0-r8,sp,lr
+ mustr r8 /* restore status register (lower half) */
+ cp r11, 0 /* can't return zero */
+ frs
+ moveq r11, 1
+ retal r11
+ .size __longjmp, . - __longjmp
+
+libc_hidden_def(__longjmp)
diff --git a/libc/sysdeps/linux/avr32/brk.c b/libc/sysdeps/linux/avr32/brk.c
new file mode 100644
index 0000000..a54b49a
--- /dev/null
+++ b/libc/sysdeps/linux/avr32/brk.c
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2004-2007 Atmel Corporation
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser General
+ * Public License. See the file "COPYING.LIB" in the main directory of this
+ * archive for more details.
+ */
+#include <errno.h>
+#include <unistd.h>
+#include <sys/syscall.h>
+
+libc_hidden_proto(brk)
+
+void *__curbrk attribute_hidden = 0;
+
+int brk (void *addr)
+{
+ void *newbrk;
+
+ newbrk = (void *)INLINE_SYSCALL(brk, 1, addr);
+
+ __curbrk = newbrk;
+
+ if (newbrk < addr) {
+ __set_errno (ENOMEM);
+ return -1;
+ }
+
+ return 0;
+}
+libc_hidden_def(brk)
diff --git a/libc/sysdeps/linux/avr32/bsd-_setjmp.S b/libc/sysdeps/linux/avr32/bsd-_setjmp.S
new file mode 100644
index 0000000..be66a10
--- /dev/null
+++ b/libc/sysdeps/linux/avr32/bsd-_setjmp.S
@@ -0,0 +1,16 @@
+/*
+ * Copyright (C) 2004-2007 Atmel Corporation
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser General
+ * Public License. See the file "COPYING.LIB" in the main directory of this
+ * archive for more details.
+ */
+
+ /* This just does a tail-call to __sigsetjmp(env, 0) */
+ .global _setjmp
+ .type _setjmp,"function"
+ .align 1
+_setjmp:
+ mov r11, 0
+ bral __GI___sigsetjmp
+ .size _setjmp, . - _setjmp
diff --git a/libc/sysdeps/linux/avr32/bsd-setjmp.S b/libc/sysdeps/linux/avr32/bsd-setjmp.S
new file mode 100644
index 0000000..4635eeb
--- /dev/null
+++ b/libc/sysdeps/linux/avr32/bsd-setjmp.S
@@ -0,0 +1,16 @@
+/*
+ * Copyright (C) 2004-2007 Atmel Corporation
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser General
+ * Public License. See the file "COPYING.LIB" in the main directory of this
+ * archive for more details.
+ */
+
+ /* This just does a tail-call to __sigsetjmp(env, 1) */
+ .global setjmp
+ .type setjmp,"function"
+ .align 1
+setjmp:
+ mov r11, 1
+ bral __GI___sigsetjmp
+ .size setjmp, . - setjmp
diff --git a/libc/sysdeps/linux/avr32/clone.c b/libc/sysdeps/linux/avr32/clone.c
new file mode 100644
index 0000000..e43b0f3
--- /dev/null
+++ b/libc/sysdeps/linux/avr32/clone.c
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2004 Atmel Corporation
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser General
+ * Public License. See the file "COPYING.LIB" in the main directory of this
+ * archive for more details.
+ */
+#include <errno.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+
+/*
+ * I don't know if we can be absolutely certain that the fn and arg
+ * parameters are preserved when returning as the child. If the
+ * compiler stores them in registers (r0-r7), they should be.
+ */
+int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg)
+{
+ register int (*_fn)(void *arg) = fn;
+ register void *_arg = arg;
+ int err;
+
+ /* Sanity check the arguments */
+ err = -EINVAL;
+ if (!fn)
+ goto syscall_error;
+ if (!child_stack)
+ goto syscall_error;
+
+ err = INLINE_SYSCALL(clone, 2, flags, child_stack);
+ if (err < 0)
+ goto syscall_error;
+ else if (err != 0)
+ return err;
+
+ _exit(_fn(_arg));
+
+syscall_error:
+ __set_errno (-err);
+ return -1;
+}
diff --git a/libc/sysdeps/linux/avr32/crt1.S b/libc/sysdeps/linux/avr32/crt1.S
new file mode 100644
index 0000000..ca1fa7a
--- /dev/null
+++ b/libc/sysdeps/linux/avr32/crt1.S
@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2004-2007 Atmel Corporation
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser General
+ * Public License. See the file "COPYING.LIB" in the main directory of this
+ * archive for more details.
+ *
+ * When we enter _start, the stack looks like this:
+ * argc argument counter
+ * argv[0] pointer to program name
+ * argv[1..argc-1] pointers to program args
+ * NULL
+ * env[0..N] pointers to environment variables
+ * NULL
+ *
+ * r12 contains a function pointer to be registered with `atexit'.
+ * This is how the dynamic linker arranges to have DT_FINI functions
+ * called for shared libraries that have been loaded before this
+ * code runs.
+ *
+ * We're going to call the following function:
+ * __uClibc_main(int (*main)(int, char **, char **), int argc,
+ * char **argv, void (*app_init)(void), void (*app_fini)(void),
+ * void (*rtld_fini)(void), void *stack_end)
+ *
+ * So we need to set up things as follows:
+ * r12 = address of main
+ * r11 = argc
+ * r10 = &argv[0]
+ * r9 = address of _init
+ * r8 = address of _fini
+ * sp[0] = whatever we got passed in r12
+ */
+
+#include <features.h>
+
+ .text
+ .global _start
+ .type _start, @function
+_start:
+ /* Clear the frame pointer and link register since this is the outermost frame. */
+ mov r7, 0
+ mov lr, 0
+
+ ld.w r11, sp++ /* argc */
+ mov r10, sp /* &argv[0] */
+
+ st.w --sp, r10 /* stack_end */
+ st.w --sp, r12 /* rtld_fini */
+
+#ifdef __PIC__
+ lddpc r6, .L_GOT
+.L_RGOT:
+ rsub r6, pc
+ lda.w r9, _init
+ lda.w r8, _fini
+ lda.w r12, main
+
+ /* Ok, now run uClibc's main() -- should not return */
+ call __uClibc_main
+
+ .align 2
+.L_GOT:
+ .long .L_RGOT - _GLOBAL_OFFSET_TABLE_
+#else
+ lddpc r9, __init_addr /* app_init */
+ lddpc r8, __fini_addr /* app_fini */
+ lddpc r12, __main_addr /* main */
+
+ /* Ok, now run uClibc's main() -- should not return */
+ lddpc pc, ___uClibc_main_addr
+
+ .align 2
+__init_addr:
+ .long _init
+__fini_addr:
+ .long _fini
+__main_addr:
+ .long main
+___uClibc_main_addr:
+ .long __uClibc_main
+#endif
+ .size _start, . - _start
+
+ /*
+ * The LSB says we need this.
+ */
+ .section ".note.ABI-tag", "a"
+ .align 4
+ .long 2f - 1f /* namesz */
+ .long 4f - 3f /* descsz */
+ .long 1 /* type */
+1: .asciz "GNU" /* name */
+2: .align 4
+3: .long 0 /* Linux executable */
+ .long 2,6,0 /* Earliest compatible kernel */
+4: .align 4
diff --git a/libc/sysdeps/linux/avr32/crti.S b/libc/sysdeps/linux/avr32/crti.S
new file mode 100644
index 0000000..660f47c
--- /dev/null
+++ b/libc/sysdeps/linux/avr32/crti.S
@@ -0,0 +1,26 @@
+
+ .section .init
+ .align 2
+ .global _init
+ .type _init, @function
+_init:
+ stm --sp, r6, lr
+ lddpc r6, 2f
+1: rsub r6, pc
+ rjmp 3f
+ .align 2
+2: .long 1b - _GLOBAL_OFFSET_TABLE_
+3:
+
+ .section .fini
+ .align 2
+ .global _fini
+ .type _fini, @function
+_fini:
+ stm --sp, r6, lr
+ lddpc r6, 2f
+1: rsub r6, pc
+ rjmp 3f
+ .align 2
+2: .long 1b - _GLOBAL_OFFSET_TABLE_
+3:
diff --git a/libc/sysdeps/linux/avr32/crtn.S b/libc/sysdeps/linux/avr32/crtn.S
new file mode 100644
index 0000000..f7d1040
--- /dev/null
+++ b/libc/sysdeps/linux/avr32/crtn.S
@@ -0,0 +1,14 @@
+
+ .section .init
+ .align 2
+ .global _init
+ .type _init, @function
+ ldm sp++, r6, pc
+ .size _init, . - _init
+
+ .section .fini
+ .align 2
+ .global _fini
+ .type _fini, @function
+ ldm sp++, r6, pc
+ .size _fini, . - _fini
diff --git a/libc/sysdeps/linux/avr32/mmap.c b/libc/sysdeps/linux/avr32/mmap.c
new file mode 100644
index 0000000..2ee025a
--- /dev/null
+++ b/libc/sysdeps/linux/avr32/mmap.c
@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2004-2007 Atmel Corporation
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser General
+ * Public License. See the file "COPYING.LIB" in the main directory of this
+ * archive for more details.
+ */
+
+#include <errno.h>
+#include <unistd.h>
+#include <sys/mman.h>
+#include <sys/syscall.h>
+
+libc_hidden_proto(mmap)
+
+static _syscall6(__ptr_t, mmap2, __ptr_t, addr, size_t, len, int, prot,
+ int, flags, int, fd, __off_t, pgoff);
+
+__ptr_t mmap(__ptr_t addr, size_t len, int prot, int flags, int fd, __off_t offset)
+{
+ unsigned long page_size = sysconf(_SC_PAGESIZE);
+ unsigned long pgoff;
+
+ if (offset & (page_size - 1)) {
+ __set_errno(EINVAL);
+ return MAP_FAILED;
+ }
+
+ pgoff = (unsigned long)offset >> (31 - __builtin_clz(page_size));
+
+ return mmap2(addr, len, prot, flags, fd, pgoff);
+}
+libc_hidden_def(mmap)
diff --git a/libc/sysdeps/linux/avr32/setjmp.S b/libc/sysdeps/linux/avr32/setjmp.S
new file mode 100644
index 0000000..7d0354b
--- /dev/null
+++ b/libc/sysdeps/linux/avr32/setjmp.S
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2004-2007 Atmel Corporation
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser General
+ * Public License. See the file "COPYING.LIB" in the main directory of this
+ * archive for more details.
+ */
+#define _SETJMP_H
+#define _ASM
+#include <bits/setjmp.h>
+
+ .text
+
+ .global __sigsetjmp
+ .type __sigsetjmp,"function"
+
+ .align 1
+__sigsetjmp:
+ mustr r8
+ stm r12, r0,r1,r2,r3,r4,r5,r6,r7,r8,sp,lr
+
+ /*
+ * Make a tail call to __sigjmp_save; it takes the same args
+ * and is hidden so we don't need to mess around with the GOT.
+ */
+ rjmp __sigjmp_save
+ .size __sigsetjmp, . - __sigsetjmp
+
+libc_hidden_def(__sigsetjmp)
diff --git a/libc/sysdeps/linux/avr32/sigaction.c b/libc/sysdeps/linux/avr32/sigaction.c
new file mode 100644
index 0000000..a97ff3d
--- /dev/null
+++ b/libc/sysdeps/linux/avr32/sigaction.c
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2004-2007 Atmel Corporation
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser General
+ * Public License. See the file "COPYING.LIB" in the main directory of this
+ * archive for more details.
+ */
+#include <errno.h>
+#include <signal.h>
+#include <string.h>
+#include <sys/syscall.h>
+#include <bits/kernel_sigaction.h>
+
+#define SA_RESTORER 0x04000000
+extern void __default_rt_sa_restorer(void);
+
+libc_hidden_proto(memcpy)
+
+/*
+ * If act is not NULL, change the action for sig to *act.
+ * If oact is not NULL, put the old action for sig in *oact.
+ */
+int __libc_sigaction(int signum, const struct sigaction *act,
+ struct sigaction *oldact)
+{
+ struct kernel_sigaction kact, koact;
+ int result;
+
+ if (act) {
+ kact.k_sa_handler = act->sa_handler;
+ memcpy(&kact.sa_mask, &act->sa_mask, sizeof (kact.sa_mask));
+ kact.sa_flags = act->sa_flags;
+ if (kact.sa_flags & (SA_RESTORER | SA_ONSTACK))
+ kact.sa_restorer = act->sa_restorer;
+ else
+ kact.sa_restorer = __default_rt_sa_restorer;
+ kact.sa_flags |= SA_RESTORER;
+ }
+
+ result = __syscall_rt_sigaction(signum, act ? __ptrvalue(&kact) : NULL,
+ oldact ? __ptrvalue(&koact) : NULL,
+ _NSIG / 8);
+
+ if (oldact && result >= 0) {
+ oldact->sa_handler = koact.k_sa_handler;
+ memcpy(&oldact->sa_mask, &koact.sa_mask,
+ sizeof(oldact->sa_mask));
+ oldact->sa_flags = koact.sa_flags;
+ oldact->sa_restorer = koact.sa_restorer;
+ }
+
+ return result;
+}
+
+#ifndef LIBC_SIGACTION
+libc_hidden_proto(sigaction)
+weak_alias(__libc_sigaction, sigaction)
+libc_hidden_weak(sigaction)
+#endif
diff --git a/libc/sysdeps/linux/avr32/sigrestorer.S b/libc/sysdeps/linux/avr32/sigrestorer.S
new file mode 100644
index 0000000..df6a1ba
--- /dev/null
+++ b/libc/sysdeps/linux/avr32/sigrestorer.S
@@ -0,0 +1,15 @@
+/*
+ * Copyright (C) 2004 Atmel Corporation
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser General
+ * Public License. See the file "COPYING.LIB" in the main directory of this
+ * archive for more details.
+ */
+#include <sys/syscall.h>
+
+ .global __default_rt_sa_restorer
+ .type __default_rt_sa_restorer,"function"
+ .align 1
+__default_rt_sa_restorer:
+ mov r8, __NR_rt_sigreturn
+ scall
diff --git a/libc/sysdeps/linux/avr32/syscall.S b/libc/sysdeps/linux/avr32/syscall.S
new file mode 100644
index 0000000..55c1b1f
--- /dev/null
+++ b/libc/sysdeps/linux/avr32/syscall.S
@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2004-2007 Atmel Corporation
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser General
+ * Public License. See the file "COPYING.LIB" in the main directory of this
+ * archive for more details.
+ */
+#include <features.h>
+
+ .text
+
+ /*
+ * long int syscall(long int sysno, ...)
+ */
+ .global syscall
+ .type syscall, @function
+ .align 2
+syscall:
+ stm --sp, r3,r5,r6,lr
+ sub lr, sp, -16
+ mov r8, r12
+ ldm lr, r3,r5,r9-r12
+ scall
+ cp.w r12, -4095
+ brlo .Ldone
+
+#ifdef __PIC__
+ lddpc r6, .Lgot
+.Lgotcalc:
+ rsub r6, pc
+# ifdef __UCLIBC_HAS_THREADS__
+ rsub r3, r12, 0
+ mcall r6[__errno_location at got]
+ st.w r12[0], r3
+# else
+ ld.w r3, r6[errno at got]
+ neg r12
+ st.w r3[0], r12
+# endif
+#else
+# ifdef __UCLIBC_HAS_THREADS__
+ rsub r3, r12, 0
+ mcall .Lerrno_location
+ st.w r12[0], r3
+# else
+ lddpc r3, .Lerrno
+ neg r12
+ st.w r3[0], r12
+# endif
+#endif
+ mov r12, -1
+
+.Ldone:
+ ldm sp++, r3,r5,r6,pc
+
+ .align 2
+#ifdef __PIC__
+.Lgot:
+ .long .Lgotcalc - _GLOBAL_OFFSET_TABLE_
+#else
+# ifdef __UCLIBC_HAS_THREADS__
+.Lerrno_location:
+ .long __errno_location
+# else
+.Lerrno:
+ .long errno
+# endif
+#endif
+
+
+ .size syscall, . - syscall
diff --git a/libc/sysdeps/linux/avr32/vfork.S b/libc/sysdeps/linux/avr32/vfork.S
new file mode 100644
index 0000000..03ca99f
--- /dev/null
+++ b/libc/sysdeps/linux/avr32/vfork.S
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2005 Atmel Corporation
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser General
+ * Public License. See the file "COPYING.LIB" in the main directory of this
+ * archive for more details.
+ */
+
+/*
+ * Clone the process without copying the address space. The
+ * calling process is suspended until the child either exits
+ * or calls execve.
+ *
+ * This all means that we cannot rely on the stack to store
+ * away registers, since they will be overwritten by the child
+ * as soon as it makes another function call (e.g. execve()).
+ * Fortunately, the Linux kernel preserves LR across system calls.
+ */
+
+#include <features.h>
+#include <sys/syscall.h>
+
+ .global __vfork
+ .type __vfork, at function
+ .align 1
+__vfork:
+ mov r8, __NR_vfork
+ scall
+ cp.w r12, -4096
+ retls r12
+
+ /* vfork failed, so we may use the stack freely */
+ pushm r4-r7,lr
+#ifdef __PIC__
+ lddpc r6, .L_GOT
+ rsub r4, r12, 0
+.L_RGOT:
+ rsub r6, pc
+ mcall r6[__errno_location at got]
+#else
+ rsub r4, r12, 0
+ mcall .L__errno_location
+#endif
+ st.w r12[0], r4
+ popm r4-r7,pc,r12=-1
+
+ .align 2
+#ifdef __PIC__
+.L_GOT:
+ .long .L_RGOT - _GLOBAL_OFFSET_TABLE_
+#else
+.L__errno_location:
+ .long __errno_location
+#endif
+ .size __vfork, . - __vfork
+
+weak_alias(__vfork,vfork)
+libc_hidden_weak(vfork)
More information about the uClibc
mailing list