ChangeSet 1.1752, 2005/06/24 11:51:38+01:00, kaf24@xxxxxxxxxxxxxxxxxxxx
The set of patches below add support for loading plan9's a.out
format using the linux builder. This is considerably simpler
than having a seperate builder, shares more code and should
be easier to maintain. Hopefully the original plan9 builder
can go away in the future.
I've been able to test this manually with vm-tools but am
still having some problems (unrelated I think) with xm.
Signed-off-by: Tim Newsham <newsham@xxxxxxxx>
Makefile | 1
xc_aout9.h | 30 +++++++++
xc_linux_build.c | 4 -
xc_load_aout9.c | 166 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
xc_private.h | 1
5 files changed, 201 insertions(+), 1 deletion(-)
diff -Nru a/tools/libxc/Makefile b/tools/libxc/Makefile
--- a/tools/libxc/Makefile 2005-06-24 07:02:48 -04:00
+++ b/tools/libxc/Makefile 2005-06-24 07:02:48 -04:00
@@ -19,6 +19,7 @@
SRCS += xc_domain.c
SRCS += xc_evtchn.c
SRCS += xc_gnttab.c
+SRCS += xc_load_aout9.c
SRCS += xc_load_bin.c
SRCS += xc_load_elf.c
SRCS += xc_linux_build.c
diff -Nru a/tools/libxc/xc_aout9.h b/tools/libxc/xc_aout9.h
--- /dev/null Wed Dec 31 16:00:00 196900
+++ b/tools/libxc/xc_aout9.h 2005-06-24 07:02:48 -04:00
@@ -0,0 +1,30 @@
+
+typedef struct Exec
+{
+ long magic; /* magic number */
+ long text; /* size of text segment */
+ long data; /* size of initialized data */
+ long bss; /* size of uninitialized data */
+ long syms; /* size of symbol table */
+ long entry; /* entry point */
+ long spsz; /* size of pc/sp offset table */
+ long pcsz; /* size of pc/line number table */
+} Exec;
+
+#define _MAGIC(b) ((((4*b)+0)*b)+7)
+#define A_MAGIC _MAGIC(8) /* 68020 */
+#define I_MAGIC _MAGIC(11) /* intel 386 */
+#define J_MAGIC _MAGIC(12) /* intel 960 (retired) */
+#define K_MAGIC _MAGIC(13) /* sparc */
+#define V_MAGIC _MAGIC(16) /* mips 3000 BE */
+#define X_MAGIC _MAGIC(17) /* att dsp 3210 (retired) */
+#define M_MAGIC _MAGIC(18) /* mips 4000 BE */
+#define D_MAGIC _MAGIC(19) /* amd 29000 (retired) */
+#define E_MAGIC _MAGIC(20) /* arm */
+#define Q_MAGIC _MAGIC(21) /* powerpc */
+#define N_MAGIC _MAGIC(22) /* mips 4000 LE */
+#define L_MAGIC _MAGIC(23) /* dec alpha */
+#define P_MAGIC _MAGIC(24) /* mips 3000 LE */
+#define U_MAGIC _MAGIC(25) /* sparc64 */
+#define S_MAGIC _MAGIC(26) /* amd64 */
+
diff -Nru a/tools/libxc/xc_linux_build.c b/tools/libxc/xc_linux_build.c
--- a/tools/libxc/xc_linux_build.c 2005-06-24 07:02:48 -04:00
+++ b/tools/libxc/xc_linux_build.c 2005-06-24 07:02:48 -04:00
@@ -14,6 +14,7 @@
#include "xc_elf.h"
+#include "xc_aout9.h"
#include <stdlib.h>
#include <zlib.h>
@@ -38,7 +39,8 @@
struct load_funcs *load_funcs)
{
if ( probe_elf(image, image_size, load_funcs) &&
- probe_bin(image, image_size, load_funcs) )
+ probe_bin(image, image_size, load_funcs) &&
+ probe_aout9(image, image_size, load_funcs) )
{
ERROR( "Unrecognized image format" );
return -EINVAL;
diff -Nru a/tools/libxc/xc_load_aout9.c b/tools/libxc/xc_load_aout9.c
--- /dev/null Wed Dec 31 16:00:00 196900
+++ b/tools/libxc/xc_load_aout9.c 2005-06-24 07:02:48 -04:00
@@ -0,0 +1,166 @@
+
+#include "xc_private.h"
+#include "xc_aout9.h"
+
+#if defined(__i386__)
+ #define A9_MAGIC I_MAGIC
+#elif defined(__x86_64__)
+ #define A9_MAGIC S_MAGIC
+#elif defined(__ia64__)
+ #define A9_MAGIC 0
+#else
+#error "Unsupported architecture"
+#endif
+
+
+#define round_pgup(_p) (((_p)+(PAGE_SIZE-1))&PAGE_MASK)
+#define round_pgdown(_p) ((_p)&PAGE_MASK)
+
+static int parseaout9image(char *, unsigned long, struct domain_setup_info *);
+static int loadaout9image(char *, unsigned long, int, u32, unsigned long *,
struct domain_setup_info *);
+static void copyout(int, u32, unsigned long *, unsigned long, void *, int);
+struct Exec *get_header(unsigned char *, unsigned long, struct Exec *);
+
+
+int
+probe_aout9(
+ char *image,
+ unsigned long image_size,
+ struct load_funcs *load_funcs)
+{
+ struct Exec ehdr;
+
+ if (!get_header(image, image_size, &ehdr)) {
+ ERROR("Kernel image does not have a a.out9 header.");
+ return -EINVAL;
+ }
+
+ load_funcs->parseimage = parseaout9image;
+ load_funcs->loadimage = loadaout9image;
+ return 0;
+}
+
+static int
+parseaout9image(
+ char *image,
+ unsigned long image_size,
+ struct domain_setup_info *dsi)
+{
+ struct Exec ehdr;
+ unsigned long start, txtsz, end;
+
+ if (!get_header(image, image_size, &ehdr)) {
+ ERROR("Kernel image does not have a a.out9 header.");
+ return -EINVAL;
+ }
+
+ if (sizeof ehdr + ehdr.text + ehdr.data > image_size) {
+ ERROR("a.out program extends past end of image.");
+ return -EINVAL;
+ }
+
+ start = round_pgdown(ehdr.entry);
+ txtsz = round_pgup(ehdr.text);
+ end = start + txtsz + ehdr.data + ehdr.bss;
+
+ dsi->v_start = start;
+ dsi->v_kernstart = start;
+ dsi->v_kernend = end;
+ dsi->v_kernentry = ehdr.entry;
+ dsi->v_end = end;
+
+ /* XXX load symbols */
+
+ return 0;
+}
+
+static int
+loadaout9image(
+ char *image,
+ unsigned long image_size,
+ int xch, u32 dom,
+ unsigned long *parray,
+ struct domain_setup_info *dsi)
+{
+ struct Exec ehdr;
+ unsigned long txtsz;
+
+ if (!get_header(image, image_size, &ehdr)) {
+ ERROR("Kernel image does not have a a.out9 header.");
+ return -EINVAL;
+ }
+
+ txtsz = round_pgup(ehdr.text);
+ copyout(xch, dom, parray,
+ 0, image, sizeof ehdr + ehdr.text);
+ copyout(xch, dom, parray,
+ txtsz, image + sizeof ehdr + ehdr.text, ehdr.data);
+ /* XXX zeroing of BSS needed? */
+
+ /* XXX load symbols */
+
+ return 0;
+}
+
+/*
+ * copyout data to the domain given an offset to the start
+ * of its memory region described by parray.
+ */
+static void
+copyout(
+ int xch, u32 dom,
+ unsigned long *parray,
+ unsigned long off,
+ void *buf,
+ int sz)
+{
+ unsigned long pgoff, chunksz;
+ void *pg;
+
+ while (sz > 0) {
+ pgoff = off & (PAGE_SIZE-1);
+ chunksz = sz;
+ if(chunksz > PAGE_SIZE - pgoff)
+ chunksz = PAGE_SIZE - pgoff;
+
+ pg = xc_map_foreign_range(xch, dom, PAGE_SIZE, PROT_WRITE,
+ parray[off>>PAGE_SHIFT]);
+ memcpy(pg + pgoff, buf, chunksz);
+ munmap(pg, PAGE_SIZE);
+
+ off += chunksz;
+ buf += chunksz;
+ sz -= chunksz;
+ }
+}
+
+/*
+ * Decode the header from the start of image and return it.
+ */
+struct Exec *
+get_header(
+ unsigned char *image,
+ unsigned long image_size,
+ struct Exec *ehdr)
+{
+ unsigned long *v;
+ int i;
+
+ if (A9_MAGIC == 0)
+ return 0;
+
+ if (image_size < sizeof ehdr)
+ return 0;
+
+ /* ... all big endian words */
+ v = (unsigned long *)ehdr;
+ for (i = 0; i < sizeof *ehdr; i += 4) {
+ v[i/4] = (image[i+0]<<24) | (image[i+1]<<16) |
+ (image[i+2]<<8) | image[i+3];
+ }
+
+ if(ehdr->magic != A9_MAGIC)
+ return 0;
+ return ehdr;
+}
+
diff -Nru a/tools/libxc/xc_private.h b/tools/libxc/xc_private.h
--- a/tools/libxc/xc_private.h 2005-06-24 07:02:48 -04:00
+++ b/tools/libxc/xc_private.h 2005-06-24 07:02:48 -04:00
@@ -310,5 +310,6 @@
/* image loading */
int probe_elf(char *image, unsigned long image_size, struct load_funcs *funcs);
int probe_bin(char *image, unsigned long image_size, struct load_funcs *funcs);
+int probe_aout9(char *image, unsigned long image_size, struct load_funcs
*funcs);
#endif /* __XC_PRIVATE_H__ */
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