Import various libgcc functions from syslinux.

Experimentation reveals that gcc ignores -mrtd for the implicit arithmetic functions (e.g. __udivdi3), but not for the implicit memcpy() and memset() functions. Mark the implicit arithmetic functions with __attribute__((cdecl)) to compensate for this. (Note: we cannot mark with with __cdecl, because we define __cdecl to incorporate regparm(0) as well.)
ipxe · Jul 30, 2007 · 4ce8d61 · 4ce8d61
1 parent f62d648
commit 4ce8d61
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diff --git a/src/Makefile b/src/Makefile
@@ -145,6 +145,7 @@ DEBUG_TARGETS	+= dbg%.o c s
 
 # SRCDIRS lists all directories containing source files.
 #
+SRCDIRS		+= libgcc
 SRCDIRS		+= core
 SRCDIRS		+= proto
 SRCDIRS		+= net net/tcp net/udp

diff --git a/src/arch/i386/core/udivmod64.c b/src/arch/i386/core/udivmod64.c
diff --git a/src/libgcc/__divdi3.c b/src/libgcc/__divdi3.c
@@ -0,0 +1,26 @@
+/*
+ * arch/i386/libgcc/__divdi3.c
+ */
+
+#include "libgcc.h"
+
+LIBGCC int64_t __divdi3(int64_t num, int64_t den)
+{
+  int minus = 0;
+  int64_t v;
+
+  if ( num < 0 ) {
+    num = -num;
+    minus = 1;
+  }
+  if ( den < 0 ) {
+    den = -den;
+    minus ^= 1;
+  }
+
+  v = __udivmoddi4(num, den, NULL);
+  if ( minus )
+    v = -v;
+
+  return v;
+}
diff --git a/src/libgcc/__moddi3.c b/src/libgcc/__moddi3.c
@@ -0,0 +1,26 @@
+/*
+ * arch/i386/libgcc/__moddi3.c
+ */
+
+#include "libgcc.h"
+
+LIBGCC int64_t __moddi3(int64_t num, int64_t den)
+{
+  int minus = 0;
+  int64_t v;
+
+  if ( num < 0 ) {
+    num = -num;
+    minus = 1;
+  }
+  if ( den < 0 ) {
+    den = -den;
+    minus ^= 1;
+  }
+
+  (void) __udivmoddi4(num, den, (uint64_t *)&v);
+  if ( minus )
+    v = -v;
+
+  return v;
+}