[commit] r1265 - trunk/openbios-devel/libopenbios

[repository service]

Author: mcayland
Date: Sun Feb 16 17:26:34 2014
New Revision: 1265
URL: http://tracker.coreboot.org/trac/openbios/changeset/1265

Log:
SPARC32: copy the a.out header beneath load-base during load

NextSTEP's bootloader for Sparc32 expects that the 32 bytes a.out header
is copied just before the start address.

Since this is a compatibility hack for an implementation detail of OBP then
implement the functionality within a #define AOUT_HEADER_COPY section so
it can easily be removed if people really need a strictly compliant firmware.

Signed-off-by: Olivier Danet 
Signed-off-by: Mark Cave-Ayland

Modified:
   trunk/openbios-devel/libopenbios/aout_load.c

Modified: trunk/openbios-devel/libopenbios/aout_load.c
==============================================================================
--- trunk/openbios-devel/libopenbios/aout_load.c	Sun Feb 16 17:26:31 2014	(r1264)
+++ trunk/openbios-devel/libopenbios/aout_load.c	Sun Feb 16 17:26:34 2014	(r1265)
@@ -10,6 +10,12 @@
 #define CONFIG_SPARC64_PAGE_SIZE_8KB
 #endif

+/* NextStep bootloader on SPARC32 expects the a.out header directly
+   below load-base (0x4000) */
+#ifdef CONFIG_SPARC32
+#define AOUT_HEADER_COPY
+#endif 
+
 #include "libopenbios/sys_info.h"
 #include "libopenbios/bindings.h"
 #include "libopenbios/aout_load.h"
@@ -143,6 +149,11 @@
     debug("Loaded %lu bytes\n", size);
     debug("entry point is %#lx\n", start);

+#ifdef AOUT_HEADER_COPY
+    // Copy the a.out header just before start
+    memcpy((char *)(start - 0x20), &ehdr, 0x20);
+#endif
+
     // Initialise saved-program-state
     PUSH(addr_fixup(start));
     feval("saved-program-state >sps.entry !");