aboutsummaryrefslogtreecommitdiffstats
path: root/com32/modules
diff options
context:
space:
mode:
authorH. Peter Anvin <hpa@zytor.com>2008-01-03 15:03:35 -0800
committerH. Peter Anvin <hpa@zytor.com>2008-01-03 15:03:35 -0800
commitcaa70e42a5e2a6f74a1624900d84c33a3d71a91e (patch)
tree483bdc2881ad89166d055c7cc13f4e3a4caabc1f /com32/modules
parent0f2ce18d744974fa15a143e3b68d186bfc842583 (diff)
downloadsyslinux-caa70e42a5e2a6f74a1624900d84c33a3d71a91e.tar.gz
syslinux-caa70e42a5e2a6f74a1624900d84c33a3d71a91e.tar.xz
syslinux-caa70e42a5e2a6f74a1624900d84c33a3d71a91e.zip
Add simple module to load and run a protected-mode raw binary
Diffstat (limited to 'com32/modules')
-rw-r--r--com32/modules/Makefile4
-rw-r--r--com32/modules/pmload.c230
2 files changed, 232 insertions, 2 deletions
diff --git a/com32/modules/Makefile b/com32/modules/Makefile
index 7910020e..9925d23c 100644
--- a/com32/modules/Makefile
+++ b/com32/modules/Makefile
@@ -1,6 +1,6 @@
## -----------------------------------------------------------------------
##
-## Copyright 2001-2007 H. Peter Anvin - All Rights Reserved
+## Copyright 2001-2008 H. Peter Anvin - All Rights Reserved
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
@@ -49,7 +49,7 @@ COM32DIR = $(AUXDIR)/com32
MODULES = chain.c32 menu.c32 vesamenu.c32 ethersel.c32 mboot.c32 \
dmitest.c32 cpuidtest.c32 pcitest.c32 elf.c32 linux.c32 \
- reboot.c32
+ reboot.c32 pmload.c32
TESTFILES =
all: $(MODULES) $(TESTFILES)
diff --git a/com32/modules/pmload.c b/com32/modules/pmload.c
new file mode 100644
index 00000000..b45cf5f1
--- /dev/null
+++ b/com32/modules/pmload.c
@@ -0,0 +1,230 @@
+/* ----------------------------------------------------------------------- *
+ *
+ * Copyright 2007-2008 H. Peter Anvin - All Rights Reserved
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom
+ * the Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall
+ * be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * pmload.c
+ *
+ * Load a binary file and run it in protected mode. We give it
+ * an ELF-style invocation record, becase, why not?
+ *
+ * Usage: pmload.c32 filename address [arguments...]
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <inttypes.h>
+#include <string.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <elf.h>
+#include <console.h>
+
+#include <syslinux/loadfile.h>
+#include <syslinux/movebits.h>
+#include <syslinux/bootpm.h>
+
+/* If we don't have this much memory for the stack, signal failure */
+#define MIN_STACK 512
+
+#define DEBUG 0
+#if DEBUG
+# define dprintf printf
+#else
+# define dprintf(f, ...) ((void)0)
+#endif
+
+static inline void error(const char *msg)
+{
+ fputs(msg, stderr);
+}
+
+int boot_raw(void *ptr, size_t len, addr_t where, char **argv)
+{
+ struct syslinux_movelist *ml = NULL;
+ struct syslinux_memmap *mmap = NULL, *amap = NULL;
+ struct syslinux_pm_regs regs;
+ int argc;
+ addr_t argsize;
+ char **argp;
+ addr_t lstart, llen;
+ char *stack_frame = NULL;
+ addr_t stack_frame_size;
+ addr_t stack_pointer;
+ uint32_t *spp;
+ char *sfp;
+ addr_t sfa;
+
+ memset(&regs, 0, sizeof regs);
+
+ mmap = syslinux_memory_map();
+ amap = syslinux_dup_memmap(mmap);
+ if (!mmap || !amap)
+ goto bail;
+
+#if DEBUG
+ dprintf("Initial memory map:\n");
+ syslinux_dump_memmap(stdout, mmap);
+#endif
+
+ dprintf("Segment at 0x%08x len 0x%08x\n", where, len);
+
+ if (syslinux_memmap_type(amap, where, len) != SMT_FREE) {
+ printf("Memory segment at 0x%08x (len 0x%08x) is unavailable\n",
+ where, len);
+ goto bail; /* Memory region unavailable */
+ }
+
+ /* Mark this region as allocated in the available map */
+ if (syslinux_add_memmap(&amap, where, len, SMT_ALLOC))
+ goto bail;
+
+ /* Data present region. Create a move entry for it. */
+ if (syslinux_add_movelist(&ml, where, (addr_t)ptr, len))
+ goto bail;
+
+ /* Create the invocation record (initial stack frame) */
+
+ argsize = argc = 0;
+ for (argp = argv; *argp; argp++) {
+ dprintf("argv[%2d] = \"%s\"\n", argc, *argp);
+ argc++;
+ argsize += strlen(*argp)+1;
+ }
+
+ /* We need the argument strings, argument pointers,
+ argc, plus four zero-word terminators. */
+ stack_frame_size = argsize + argc*sizeof(char *) + 5*sizeof(long);
+ stack_frame_size = (stack_frame_size+15) & ~15;
+ stack_frame = calloc(stack_frame_size, 1);
+ if (!stack_frame)
+ goto bail;
+
+#if DEBUG
+ dprintf("Right before syslinux_memmap_largest()...\n");
+ syslinux_dump_memmap(stdout, amap);
+#endif
+
+ if (syslinux_memmap_largest(amap, SMT_FREE, &lstart, &llen))
+ goto bail; /* NO free memory?! */
+
+ if (llen < stack_frame_size+MIN_STACK+16)
+ goto bail; /* Insufficient memory */
+
+ /* Initial stack pointer address */
+ stack_pointer = (lstart+llen-stack_frame_size) & ~15;
+
+ dprintf("Stack frame at 0x%08x len 0x%08x\n",
+ stack_pointer, stack_frame_size);
+
+ /* Create the stack frame. sfp is the pointer in current memory for
+ the next argument string, sfa is the address in its final resting place.
+ spp is the pointer into the argument array in current memory. */
+ spp = (uint32_t *)stack_frame;
+ sfp = stack_frame + argc*sizeof(char *) + 5*sizeof(long);
+ sfa = stack_pointer + argc*sizeof(char *) + 5*sizeof(long);
+
+ *spp++ = argc;
+ for (argp = argv; *argp; argp++) {
+ int bytes = strlen(*argp) + 1; /* Including final null */
+ *spp++ = sfa;
+ memcpy(sfp, *argp, bytes);
+ sfp += bytes;
+ sfa += bytes;
+ }
+ /* Zero fields are aready taken care of by calloc() */
+
+ /* ... and we'll want to move it into the right place... */
+#if DEBUG
+ if (syslinux_memmap_type(amap, stack_pointer, stack_frame_size)
+ != SMT_FREE) {
+ dprintf("Stack frame area not free (how did that happen?)!\n");
+ goto bail; /* Memory region unavailable */
+ }
+#endif
+
+ if (syslinux_add_memmap(&amap, stack_pointer, stack_frame_size, SMT_ALLOC))
+ goto bail;
+
+ if (syslinux_add_movelist(&ml, stack_pointer, (addr_t)stack_frame,
+ stack_frame_size))
+ goto bail;
+
+ memset(&regs, 0, sizeof regs);
+ regs.eip = where;
+ regs.esp = stack_pointer;
+
+#if DEBUG
+ dprintf("Final memory map:\n");
+ syslinux_dump_memmap(stdout, mmap);
+
+ dprintf("Final available map:\n");
+ syslinux_dump_memmap(stdout, amap);
+
+ dprintf("Movelist:\n");
+ syslinux_dump_movelist(stdout, ml);
+#endif
+
+ /* This should not return... */
+ fputs("Booting...\n", stdout);
+ syslinux_shuffle_boot_pm(ml, mmap, 0, &regs);
+
+ bail:
+ if (stack_frame)
+ free(stack_frame);
+ syslinux_free_memmap(amap);
+ syslinux_free_memmap(mmap);
+ syslinux_free_movelist(ml);
+
+ return -1;
+}
+
+int main(int argc, char *argv[])
+{
+ void *data;
+ size_t data_len;
+ addr_t where;
+
+ openconsole(&dev_null_r, &dev_stdcon_w);
+
+ if (argc < 3) {
+ error("Usage: pmload.c32 bin_file address arguments...\n");
+ return 1;
+ }
+
+ where = strtoul(argv[2], NULL, 0);
+
+ if (loadfile(argv[1], &data, &data_len)) {
+ error("Unable to load file\n");
+ return 1;
+ }
+
+ boot_raw(data, data_len, where, &argv[1]);
+ error("Failed to boot, probably insufficient memory\n");
+ return 1;
+}