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authorDavid McCullough <davidm@snapgear.com>2003-02-05 12:50:23 +0000
committerDavid McCullough <davidm@snapgear.com>2003-02-05 12:50:23 +0000
commit2e9500a6c94ccbabda48c7157d92541da0dbc442 (patch)
tree3252b506e088352da19e2be5c0dc2c0e3b49ab80 /libc/sysdeps/linux
parent33fd05be5614bde6bd96c0d6a7020a2bca376487 (diff)
add brk for m68k
NOTE: on uClinux-2.[45] kernels, brk works but is limited to slack space in the memory allocated to the process.
Diffstat (limited to 'libc/sysdeps/linux')
-rw-r--r--libc/sysdeps/linux/m68k/Makefile2
-rw-r--r--libc/sysdeps/linux/m68k/brk.c30
2 files changed, 31 insertions, 1 deletions
diff --git a/libc/sysdeps/linux/m68k/Makefile b/libc/sysdeps/linux/m68k/Makefile
index 36970c6df..a98352198 100644
--- a/libc/sysdeps/linux/m68k/Makefile
+++ b/libc/sysdeps/linux/m68k/Makefile
@@ -33,7 +33,7 @@ CRT0_OBJ = crt0.o crt1.o
SSRC= __longjmp.S bsd-_setjmp.S bsd-setjmp.S clone.S setjmp.S vfork.S
SOBJS=$(patsubst %.S,%.o, $(SSRC))
-CSRC=ptrace.c
+CSRC=ptrace.c brk.c
COBJS=$(patsubst %.c,%.o, $(CSRC))
OBJS=$(SOBJS) $(MOBJ) $(COBJS)
diff --git a/libc/sysdeps/linux/m68k/brk.c b/libc/sysdeps/linux/m68k/brk.c
new file mode 100644
index 000000000..1fe1090d3
--- /dev/null
+++ b/libc/sysdeps/linux/m68k/brk.c
@@ -0,0 +1,30 @@
+/* consider this code LGPL - davidm */
+
+#include <unistd.h>
+#include <sys/syscall.h>
+#include <errno.h>
+
+/* This must be initialized data because commons can't have aliases. */
+void * ___brk_addr = 0;
+
+int brk (void *addr)
+{
+ void *newbrk;
+
+ __asm__ volatile ("movel %2,%/d1\n\t"
+ "moveq %1,%/d0\n\t"
+ "trap #0\n\t"
+ "movel %/d0,%0"
+ :"=g" (newbrk)
+ :"i" (__NR_brk),"g" (addr) : "%d0", "%d1");
+
+ ___brk_addr = newbrk;
+
+ if (newbrk < addr)
+ {
+ __set_errno (ENOMEM);
+ return -1;
+ }
+
+ return 0;
+}