From ae97a89e1a1a9833080dccc81f6cd26784e1b964 Mon Sep 17 00:00:00 2001
From: Eric Andersen <andersen@codepoet.org>
Date: Thu, 11 Jan 2001 11:42:17 +0000
Subject: A large update from Manuel Novoa III <mnovoa3@bellsouth.net>.

---
 libc/sysdeps/linux/i386/Makefile           | 13 ++++++----
 libc/sysdeps/linux/i386/__init_brk.c       | 33 +++++++++++++++++++++++++
 libc/sysdeps/linux/i386/__uClibc_syscall.S | 39 ++++++++++++++++++++++++++++++
 libc/sysdeps/linux/i386/brk.c              | 32 ++++++++++++++++++++++++
 libc/sysdeps/linux/i386/sbrk.c             | 35 +++++++++++++++++++++++++++
 5 files changed, 147 insertions(+), 5 deletions(-)
 create mode 100644 libc/sysdeps/linux/i386/__init_brk.c
 create mode 100644 libc/sysdeps/linux/i386/__uClibc_syscall.S
 create mode 100644 libc/sysdeps/linux/i386/brk.c
 create mode 100644 libc/sysdeps/linux/i386/sbrk.c

(limited to 'libc/sysdeps/linux/i386')

diff --git a/libc/sysdeps/linux/i386/Makefile b/libc/sysdeps/linux/i386/Makefile
index f4520b4ac..9c487bfd1 100644
--- a/libc/sysdeps/linux/i386/Makefile
+++ b/libc/sysdeps/linux/i386/Makefile
@@ -26,9 +26,12 @@ LIBC=$(TOPDIR)libc.a
 ASFLAGS=$(CFLAGS)
 
 SSRC=_start.S longjmp.S setjmp.S #_start.S #clone.S
+ifeq ($(UNIFIED_SYSCALL),true)
+	SSRC += __uClibc_syscall.S
+endif
 SOBJS=$(patsubst %.S,%.o, $(SSRC))
 
-CSRC=fork.c vfork.c
+CSRC=fork.c vfork.c __init_brk.c brk.c sbrk.c
 COBJS=$(patsubst %.c,%.o, $(CSRC))
 
 OBJS=$(SOBJS) $(COBJS)
@@ -41,12 +44,12 @@ $(LIBC): ar-target
 ar-target: $(OBJS)
 	$(AR) $(ARFLAGS) $(LIBC) $(OBJS)
 
-$(SOBJS): 
-	$(CC) $(CFLAGS) $< -c $*.S -o $*.o
+$(SOBJS): %.o : %.S
+	$(CC) $(CFLAGS) -c $< -o $@
 	$(STRIPTOOL) -x -R .note -R .comment $*.o
 
-$(COBJS):
-	$(CC) $(CFLAGS) $< -c $*.c -o $*.o
+$(COBJS): %.o : %.c
+	$(CC) $(CFLAGS) -c $< -o $@
 	$(STRIPTOOL) -x -R .note -R .comment $*.o
 
 clean:
diff --git a/libc/sysdeps/linux/i386/__init_brk.c b/libc/sysdeps/linux/i386/__init_brk.c
new file mode 100644
index 000000000..c2ae482dd
--- /dev/null
+++ b/libc/sysdeps/linux/i386/__init_brk.c
@@ -0,0 +1,33 @@
+/* From libc-5.3.12 */
+
+#include <unistd.h>
+#include <sys/syscall.h>
+#include <errno.h>
+
+void * ___brk_addr = 0;
+
+int
+__init_brk ()
+{
+    if (___brk_addr == 0)
+    {
+#if defined(__PIC__) || defined (__pic__)
+	__asm__ volatile ("pushl %%ebx\n\t"
+			  "movl $0,%%ebx\n\t"
+			  "int $0x80\n\t"
+			  "popl %%ebx"
+		:"=a" (___brk_addr)
+		:"0" (SYS_brk));
+#else
+	__asm__ volatile ("int $0x80"
+		:"=a" (___brk_addr)
+		:"0" (SYS_brk),"b" (0));
+#endif
+	if (___brk_addr == 0)
+	{
+	  errno = ENOMEM;
+	  return -1;
+	}
+    }
+    return 0;
+}
diff --git a/libc/sysdeps/linux/i386/__uClibc_syscall.S b/libc/sysdeps/linux/i386/__uClibc_syscall.S
new file mode 100644
index 000000000..ecf2d6350
--- /dev/null
+++ b/libc/sysdeps/linux/i386/__uClibc_syscall.S
@@ -0,0 +1,39 @@
+.globl __uClibc_syscall
+
+.text
+	.align 4
+__uClibc_syscall:
+	pushl %ebp
+	movl %esp,%ebp
+	subl $8,%esp
+	pushl %edi
+	pushl %esi
+	pushl %ebx
+	/* movl $21,%eax */
+	and $0xff,%eax
+	movl 8(%ebp),%ebx
+	movl 12(%ebp),%ecx
+	movl 16(%ebp),%edx
+	movl 20(%ebp),%esi
+	movl 24(%ebp),%edi
+#APP
+	int $0x80
+#NO_APP
+	movl %eax,-4(%ebp)
+	.p2align 4,,7
+	cmpl $-126,-4(%ebp)
+	jbe .L5
+	movl -4(%ebp),%eax
+	negl %eax
+	movl %eax,errno
+	movl $-1,-4(%ebp)
+.L5:
+	movl -4(%ebp),%edx
+	movl %edx,-8(%ebp)
+	movl -8(%ebp),%eax
+	leal -20(%ebp),%esp
+	popl %ebx
+	popl %esi
+	popl %edi
+	leave
+	ret
diff --git a/libc/sysdeps/linux/i386/brk.c b/libc/sysdeps/linux/i386/brk.c
new file mode 100644
index 000000000..2a776bac1
--- /dev/null
+++ b/libc/sysdeps/linux/i386/brk.c
@@ -0,0 +1,32 @@
+/* From libc-5.3.12 */
+
+#include <unistd.h>
+#include <sys/syscall.h>
+#include <errno.h>
+
+extern void * ___brk_addr;
+
+extern int __init_brk ();
+
+int brk(void * end_data_seg)
+{
+    if (__init_brk () == 0)
+    {
+#if defined(__PIC__) || defined (__pic__)
+	__asm__ volatile ("pushl %%ebx\n\t"
+			  "movl %%ecx,%%ebx\n\t"
+			  "int $0x80\n\t"
+			  "popl %%ebx"
+		:"=a" (___brk_addr)
+		:"0" (SYS_brk),"c" (end_data_seg));
+#else
+	__asm__ volatile ("int $0x80"
+		:"=a" (___brk_addr)
+		:"0" (SYS_brk),"b" (end_data_seg));
+#endif
+	if (___brk_addr == end_data_seg)
+		return 0;
+	errno = ENOMEM;
+    }
+    return -1;
+}
diff --git a/libc/sysdeps/linux/i386/sbrk.c b/libc/sysdeps/linux/i386/sbrk.c
new file mode 100644
index 000000000..f5099d7e8
--- /dev/null
+++ b/libc/sysdeps/linux/i386/sbrk.c
@@ -0,0 +1,35 @@
+/* From libc-5.3.12 */
+
+#include <unistd.h>
+#include <sys/syscall.h>
+#include <errno.h>
+
+extern void * ___brk_addr;
+
+extern int __init_brk (void);
+
+void *
+sbrk(ptrdiff_t increment)
+{
+    if (__init_brk () == 0)
+    {
+	void * tmp = ___brk_addr+increment;
+#if defined(__PIC__) || defined (__pic__)
+	__asm__ volatile ("pushl %%ebx\n\t"
+			  "movl %%ecx,%%ebx\n\t"
+                          "int $0x80\n\t"
+                          "popl %%ebx"
+		:"=a" (___brk_addr)
+		:"0" (SYS_brk),"c" (tmp));
+#else
+	__asm__ volatile ("int $0x80"
+		:"=a" (___brk_addr)
+		:"0" (SYS_brk),"b" (tmp));
+#endif
+	if (___brk_addr == tmp)
+		return tmp-increment;
+	errno = ENOMEM;
+	return ((void *) -1);
+    }
+    return ((void *) -1);
+}
-- 
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