1 files changed, 303 insertions, 0 deletions
diff --git a/ao-tools/ao-stmload/ao-elf.c b/ao-tools/ao-stmload/ao-elf.c
new file mode 100644
index 00000000..dad8fb80
--- /dev/null
+++ b/ao-tools/ao-stmload/ao-elf.c
@@ -0,0 +1,303 @@
+/*
+ * Copyright © 2013 Keith Packard <keithp@keithp.com>
+ *
+ * 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
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+#include "ao-elf.h"
+#include <err.h>
+#include <gelf.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include "ccdbg.h"
+#include "ao-stmload.h"
+
+/*
+ * Look through the Elf file for the AltOS symbols
+ * that can be adjusted before the image is written
+ * to the device
+ */
+static int
+find_symbols (Elf *e)
+{
+	Elf_Scn 	*scn;
+	Elf_Data	*symbol_data = NULL;
+	GElf_Shdr	shdr;
+	GElf_Sym       	sym;
+	int		i, symbol_count, s;
+	int		required = 0;
+	char		*symbol_name;
+	char		*section_name;
+	size_t		shstrndx;
+
+	if (elf_getshdrstrndx(e, &shstrndx) < 0)
+		return 0;
+
+	/*
+	 * Find the symbols
+	 */
+
+	scn = NULL;
+	while ((scn = elf_nextscn(e, scn)) != NULL) {
+
+		if (gelf_getshdr(scn, &shdr) != &shdr)
+			return 0;
+
+		if (shdr.sh_type == SHT_SYMTAB) {
+			symbol_data = elf_getdata(scn, NULL);
+			symbol_count = shdr.sh_size / shdr.sh_entsize;
+			break;
+		}
+	}
+
+	if (!symbol_data)
+		return 0;
+
+	for (i = 0; i < symbol_count; i++) {
+		gelf_getsym(symbol_data, i, &sym);
+
+		symbol_name = elf_strptr(e, shdr.sh_link, sym.st_name);
+
+		for (s = 0; s < ao_num_symbols; s++)
+			if (!strcmp (ao_symbols[s].name, symbol_name)) {
+				int	t;
+				ao_symbols[s].addr = sym.st_value;
+				if (ao_symbols[s].required)
+					++required;
+			}
+	}
+
+	return required >= ao_num_required_symbols;
+}
+
+uint32_t round4(uint32_t a) {
+	return (a + 3) & ~3;
+}
+
+struct hex_image *
+new_load (uint32_t addr, uint32_t len)
+{
+	struct hex_image *new;
+
+	len = round4(len);
+	new = calloc (1, sizeof (struct hex_image) + len);
+	if (!new)
+		abort();
+
+	new->address = addr;
+	new->length = len;
+	return new;
+}
+
+void
+load_paste(struct hex_image *into, struct hex_image *from)
+{
+	if (from->address < into->address || into->address + into->length < from->address + from->length)
+		abort();
+
+	memcpy(into->data + from->address - into->address, from->data, from->length);
+}
+
+/*
+ * Make a new load structure large enough to hold the old one and
+ * the new data
+ */
+struct hex_image *
+expand_load(struct hex_image *from, uint32_t address, uint32_t length)
+{
+	struct hex_image	*new;
+
+	if (from) {
+		uint32_t	from_last = from->address + from->length;
+		uint32_t	last = address + length;
+
+		if (address > from->address)
+			address = from->address;
+		if (last < from_last)
+			last = from_last;
+
+		length = last - address;
+
+		if (address == from->address && length == from->length)
+			return from;
+	}
+	new = new_load(address, length);
+	if (from) {
+		load_paste(new, from);
+		free (from);
+	}
+	return new;
+}
+
+/*
+ * Create a new load structure with data from the existing one
+ * and the new data
+ */
+struct hex_image *
+load_write(struct hex_image *from, uint32_t address, uint32_t length, void *data)
+{
+	struct hex_image	*new;
+
+	new = expand_load(from, address, length);
+	memcpy(new->data + address - new->address, data, length);
+	return new;
+}
+
+/*
+ * Construct a large in-memory block for all
+ * of the loaded sections of the program
+ */
+static struct hex_image *
+get_load(Elf *e)
+{
+	Elf_Scn 	*scn;
+	size_t		shstrndx;
+	GElf_Shdr	shdr;
+	Elf_Data	*data;
+	char		*got_name;
+	size_t		nphdr;
+	size_t		p;
+	GElf_Phdr	phdr;
+	GElf_Addr	p_paddr;
+	GElf_Off	p_offset;
+	GElf_Addr	sh_paddr;
+	struct hex_image	*load = NULL;
+	char		*section_name;
+	size_t		nshdr;
+	size_t		s;
+	
+	if (elf_getshdrstrndx(e, &shstrndx) < 0)
+		return 0;
+
+	if (elf_getphdrnum(e, &nphdr) < 0)
+		return 0;
+
+	if (elf_getshdrnum(e, &nshdr) < 0)
+		return 0;
+
+	/*
+	 * As far as I can tell, all of the phdr sections should
+	 * be flashed to memory
+	 */
+	for (p = 0; p < nphdr; p++) {
+
+		/* Find this phdr */
+		gelf_getphdr(e, p, &phdr);
+
+		if (phdr.p_type != PT_LOAD)
+			continue;
+
+		p_offset = phdr.p_offset;
+		/* Get the associated file section */
+
+#if 0
+		printf ("offset %08x vaddr %08x paddr %08x filesz %08x memsz %08x\n",
+			(uint32_t) phdr.p_offset,
+			(uint32_t) phdr.p_vaddr,
+			(uint32_t) phdr.p_paddr,
+			(uint32_t) phdr.p_filesz,
+			(uint32_t) phdr.p_memsz);
+#endif
+		
+		for (s = 0; s < nshdr; s++) {
+			scn = elf_getscn(e, s);
+
+			if (!scn) {
+				printf ("getscn failed\n");
+				abort();
+			}
+			if (gelf_getshdr(scn, &shdr) != &shdr) {
+				printf ("gelf_getshdr failed\n");
+				abort();
+			}
+
+			section_name = elf_strptr(e, shstrndx, shdr.sh_name);
+
+			if (phdr.p_offset <= shdr.sh_offset && shdr.sh_offset < phdr.p_offset + phdr.p_filesz) {
+					
+				if (shdr.sh_size == 0)
+					continue;
+
+				sh_paddr = phdr.p_paddr + shdr.sh_offset - phdr.p_offset;
+
+				printf ("\tsize %08x rom %08x exec %08x %s\n",
+					(uint32_t) shdr.sh_size,
+					(uint32_t) sh_paddr,
+					(uint32_t) shdr.sh_addr,
+					section_name);
+
+				data = elf_getdata(scn, NULL);
+
+				/* Write the section data into the memory block */
+				load = load_write(load, sh_paddr, shdr.sh_size, data->d_buf);
+			}
+		}
+	}
+	return load;
+}
+
+/*
+ * Open the specified ELF file and
+ * check for the symbols we need
+ */
+
+struct hex_image *
+ao_load_elf(char *name)
+{
+	int		fd;
+	Elf		*e;
+	Elf_Scn 	*scn;
+	Elf_Data	*symbol_data = NULL;
+	GElf_Shdr	shdr;
+	GElf_Sym       	sym;
+	size_t		n, shstrndx, sz;
+	int		i, symbol_count, s;
+	int		required = 0;
+	struct hex_image	*image;
+
+	if (elf_version(EV_CURRENT) == EV_NONE)
+		return NULL;
+
+	fd = open(name, O_RDONLY, 0);
+
+	if (fd < 0)
+		return NULL;
+
+	e = elf_begin(fd, ELF_C_READ, NULL);
+
+	if (!e)
+		return NULL;
+
+	if (elf_kind(e) != ELF_K_ELF)
+		return NULL;
+
+	if (elf_getshdrstrndx(e, &shstrndx) != 0)
+		return NULL;
+
+	if (!find_symbols(e)) {
+		fprintf (stderr, "Cannot find required symbols\n");
+		return NULL;
+	}
+
+	image = get_load(e);
+	if (!image) {
+		fprintf (stderr, "Cannot create memory image from file\n");
+		return NULL;
+	}
+
+	return image;
+}