Compile loader only once

Callers must pass ELF machine, byte swapping and symbol LSB clearing
information to ELF loader. A.out loader needs page size information, pass
that too as a parameter.

Extract prototypes to a separate file. Move loader.[ch] and elf_ops.h under hw.

Adjust callers. Also use target_phys_addr_t instead of target_ulong for
addresses: loader addresses aren't virtual.

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

1 files changed, 546 insertions, 0 deletions

diff --git a/hw/loader.c b/hw/loader.c
new file mode 100644
index 0000000..5d83a66
--- /dev/null
+++ b/hw/loader.c
@@ -0,0 +1,546 @@
+/*
+ * QEMU Executable loader
+ *
+ * Copyright (c) 2006 Fabrice Bellard
+ *
+ * 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.
+ *
+ * Gunzip functionality in this file is derived from u-boot:
+ *
+ * (C) Copyright 2008 Semihalf
+ *
+ * (C) Copyright 2000-2005
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * 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; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "hw.h"
+#include "disas.h"
+#include "sysemu.h"
+#include "uboot_image.h"
+#include "loader.h"
+
+#include <zlib.h>
+
+/* return the size or -1 if error */
+int get_image_size(const char *filename)
+{
+    int fd, size;
+    fd = open(filename, O_RDONLY | O_BINARY);
+    if (fd < 0)
+        return -1;
+    size = lseek(fd, 0, SEEK_END);
+    close(fd);
+    return size;
+}
+
+/* return the size or -1 if error */
+/* deprecated, because caller does not specify buffer size! */
+int load_image(const char *filename, uint8_t *addr)
+{
+    int fd, size;
+    fd = open(filename, O_RDONLY | O_BINARY);
+    if (fd < 0)
+        return -1;
+    size = lseek(fd, 0, SEEK_END);
+    lseek(fd, 0, SEEK_SET);
+    if (read(fd, addr, size) != size) {
+        close(fd);
+        return -1;
+    }
+    close(fd);
+    return size;
+}
+
+/* return the amount read, just like fread.  0 may mean error or eof */
+int fread_targphys(target_phys_addr_t dst_addr, size_t nbytes, FILE *f)
+{
+    uint8_t buf[4096];
+    target_phys_addr_t dst_begin = dst_addr;
+    size_t want, did;
+
+    while (nbytes) {
+	want = nbytes > sizeof(buf) ? sizeof(buf) : nbytes;
+	did = fread(buf, 1, want, f);
+
+	cpu_physical_memory_write_rom(dst_addr, buf, did);
+	dst_addr += did;
+	nbytes -= did;
+	if (did != want)
+	    break;
+    }
+    return dst_addr - dst_begin;
+}
+
+/* returns 0 on error, 1 if ok */
+int fread_targphys_ok(target_phys_addr_t dst_addr, size_t nbytes, FILE *f)
+{
+    return fread_targphys(dst_addr, nbytes, f) == nbytes;
+}
+
+/* read()-like version */
+int read_targphys(int fd, target_phys_addr_t dst_addr, size_t nbytes)
+{
+    uint8_t buf[4096];
+    target_phys_addr_t dst_begin = dst_addr;
+    size_t want, did;
+
+    while (nbytes) {
+	want = nbytes > sizeof(buf) ? sizeof(buf) : nbytes;
+	did = read(fd, buf, want);
+	if (did != want) break;
+
+	cpu_physical_memory_write_rom(dst_addr, buf, did);
+	dst_addr += did;
+	nbytes -= did;
+    }
+    return dst_addr - dst_begin;
+}
+
+/* return the size or -1 if error */
+int load_image_targphys(const char *filename,
+			target_phys_addr_t addr, int max_sz)
+{
+    FILE *f;
+    size_t got;
+
+    f = fopen(filename, "rb");
+    if (!f) return -1;
+
+    got = fread_targphys(addr, max_sz, f);
+    if (ferror(f)) { fclose(f); return -1; }
+    fclose(f);
+
+    return got;
+}
+
+void pstrcpy_targphys(target_phys_addr_t dest, int buf_size,
+                      const char *source)
+{
+    static const uint8_t nul_byte = 0;
+    const char *nulp;
+
+    if (buf_size <= 0) return;
+    nulp = memchr(source, 0, buf_size);
+    if (nulp) {
+	cpu_physical_memory_write_rom(dest, (uint8_t *)source,
+                                      (nulp - source) + 1);
+    } else {
+	cpu_physical_memory_write_rom(dest, (uint8_t *)source, buf_size - 1);
+	cpu_physical_memory_write_rom(dest, &nul_byte, 1);
+    }
+}
+
+/* A.OUT loader */
+
+struct exec
+{
+  uint32_t a_info;   /* Use macros N_MAGIC, etc for access */
+  uint32_t a_text;   /* length of text, in bytes */
+  uint32_t a_data;   /* length of data, in bytes */
+  uint32_t a_bss;    /* length of uninitialized data area, in bytes */
+  uint32_t a_syms;   /* length of symbol table data in file, in bytes */
+  uint32_t a_entry;  /* start address */
+  uint32_t a_trsize; /* length of relocation info for text, in bytes */
+  uint32_t a_drsize; /* length of relocation info for data, in bytes */
+};
+
+static void bswap_ahdr(struct exec *e)
+{
+    bswap32s(&e->a_info);
+    bswap32s(&e->a_text);
+    bswap32s(&e->a_data);
+    bswap32s(&e->a_bss);
+    bswap32s(&e->a_syms);
+    bswap32s(&e->a_entry);
+    bswap32s(&e->a_trsize);
+    bswap32s(&e->a_drsize);
+}
+
+#define N_MAGIC(exec) ((exec).a_info & 0xffff)
+#define OMAGIC 0407
+#define NMAGIC 0410
+#define ZMAGIC 0413
+#define QMAGIC 0314
+#define _N_HDROFF(x) (1024 - sizeof (struct exec))
+#define N_TXTOFF(x)							\
+    (N_MAGIC(x) == ZMAGIC ? _N_HDROFF((x)) + sizeof (struct exec) :	\
+     (N_MAGIC(x) == QMAGIC ? 0 : sizeof (struct exec)))
+#define N_TXTADDR(x, target_page_size) (N_MAGIC(x) == QMAGIC ? target_page_size : 0)
+#define _N_SEGMENT_ROUND(x, target_page_size) (((x) + target_page_size - 1) & ~(target_page_size - 1))
+
+#define _N_TXTENDADDR(x, target_page_size) (N_TXTADDR(x, target_page_size)+(x).a_text)
+
+#define N_DATADDR(x, target_page_size) \
+    (N_MAGIC(x)==OMAGIC? (_N_TXTENDADDR(x, target_page_size)) \
+     : (_N_SEGMENT_ROUND (_N_TXTENDADDR(x, target_page_size), target_page_size)))
+
+
+int load_aout(const char *filename, target_phys_addr_t addr, int max_sz,
+              int bswap_needed, target_phys_addr_t target_page_size)
+{
+    int fd, size, ret;
+    struct exec e;
+    uint32_t magic;
+
+    fd = open(filename, O_RDONLY | O_BINARY);
+    if (fd < 0)
+        return -1;
+
+    size = read(fd, &e, sizeof(e));
+    if (size < 0)
+        goto fail;
+
+    if (bswap_needed) {
+        bswap_ahdr(&e);
+    }
+
+    magic = N_MAGIC(e);
+    switch (magic) {
+    case ZMAGIC:
+    case QMAGIC:
+    case OMAGIC:
+        if (e.a_text + e.a_data > max_sz)
+            goto fail;
+	lseek(fd, N_TXTOFF(e), SEEK_SET);
+	size = read_targphys(fd, addr, e.a_text + e.a_data);
+	if (size < 0)
+	    goto fail;
+	break;
+    case NMAGIC:
+        if (N_DATADDR(e, target_page_size) + e.a_data > max_sz)
+            goto fail;
+	lseek(fd, N_TXTOFF(e), SEEK_SET);
+	size = read_targphys(fd, addr, e.a_text);
+	if (size < 0)
+	    goto fail;
+        ret = read_targphys(fd, addr + N_DATADDR(e, target_page_size),
+                            e.a_data);
+	if (ret < 0)
+	    goto fail;
+	size += ret;
+	break;
+    default:
+	goto fail;
+    }
+    close(fd);
+    return size;
+ fail:
+    close(fd);
+    return -1;
+}
+
+/* ELF loader */
+
+static void *load_at(int fd, int offset, int size)
+{
+    void *ptr;
+    if (lseek(fd, offset, SEEK_SET) < 0)
+        return NULL;
+    ptr = qemu_malloc(size);
+    if (read(fd, ptr, size) != size) {
+        qemu_free(ptr);
+        return NULL;
+    }
+    return ptr;
+}
+
+#ifdef ELF_CLASS
+#undef ELF_CLASS
+#endif
+
+#define ELF_CLASS   ELFCLASS32
+#include "elf.h"
+
+#define SZ		32
+#define elf_word        uint32_t
+#define elf_sword        int32_t
+#define bswapSZs	bswap32s
+#include "elf_ops.h"
+
+#undef elfhdr
+#undef elf_phdr
+#undef elf_shdr
+#undef elf_sym
+#undef elf_note
+#undef elf_word
+#undef elf_sword
+#undef bswapSZs
+#undef SZ
+#define elfhdr		elf64_hdr
+#define elf_phdr	elf64_phdr
+#define elf_note	elf64_note
+#define elf_shdr	elf64_shdr
+#define elf_sym		elf64_sym
+#define elf_word        uint64_t
+#define elf_sword        int64_t
+#define bswapSZs	bswap64s
+#define SZ		64
+#include "elf_ops.h"
+
+/* return < 0 if error, otherwise the number of bytes loaded in memory */
+int load_elf(const char *filename, int64_t address_offset,
+             uint64_t *pentry, uint64_t *lowaddr, uint64_t *highaddr,
+             int big_endian, int elf_machine, int clear_lsb)
+{
+    int fd, data_order, target_data_order, must_swab, ret;
+    uint8_t e_ident[EI_NIDENT];
+
+    fd = open(filename, O_RDONLY | O_BINARY);
+    if (fd < 0) {
+        perror(filename);
+        return -1;
+    }
+    if (read(fd, e_ident, sizeof(e_ident)) != sizeof(e_ident))
+        goto fail;
+    if (e_ident[0] != ELFMAG0 ||
+        e_ident[1] != ELFMAG1 ||
+        e_ident[2] != ELFMAG2 ||
+        e_ident[3] != ELFMAG3)
+        goto fail;
+#ifdef HOST_WORDS_BIGENDIAN
+    data_order = ELFDATA2MSB;
+#else
+    data_order = ELFDATA2LSB;
+#endif
+    must_swab = data_order != e_ident[EI_DATA];
+    if (big_endian) {
+        target_data_order = ELFDATA2MSB;
+    } else {
+        target_data_order = ELFDATA2LSB;
+    }
+
+    if (target_data_order != e_ident[EI_DATA])
+        return -1;
+
+    lseek(fd, 0, SEEK_SET);
+    if (e_ident[EI_CLASS] == ELFCLASS64) {
+        ret = load_elf64(fd, address_offset, must_swab, pentry,
+                         lowaddr, highaddr, elf_machine, clear_lsb);
+    } else {
+        ret = load_elf32(fd, address_offset, must_swab, pentry,
+                         lowaddr, highaddr, elf_machine, clear_lsb);
+    }
+
+    close(fd);
+    return ret;
+
+ fail:
+    close(fd);
+    return -1;
+}
+
+static void bswap_uboot_header(uboot_image_header_t *hdr)
+{
+#ifndef HOST_WORDS_BIGENDIAN
+    bswap32s(&hdr->ih_magic);
+    bswap32s(&hdr->ih_hcrc);
+    bswap32s(&hdr->ih_time);
+    bswap32s(&hdr->ih_size);
+    bswap32s(&hdr->ih_load);
+    bswap32s(&hdr->ih_ep);
+    bswap32s(&hdr->ih_dcrc);
+#endif
+}
+
+
+#define ZALLOC_ALIGNMENT	16
+
+static void *zalloc(void *x, unsigned items, unsigned size)
+{
+    void *p;
+
+    size *= items;
+    size = (size + ZALLOC_ALIGNMENT - 1) & ~(ZALLOC_ALIGNMENT - 1);
+
+    p = qemu_malloc(size);
+
+    return (p);
+}
+
+static void zfree(void *x, void *addr)
+{
+    qemu_free(addr);
+}
+
+
+#define HEAD_CRC	2
+#define EXTRA_FIELD	4
+#define ORIG_NAME	8
+#define COMMENT		0x10
+#define RESERVED	0xe0
+
+#define DEFLATED	8
+
+/* This is the maximum in uboot, so if a uImage overflows this, it would
+ * overflow on real hardware too. */
+#define UBOOT_MAX_GUNZIP_BYTES 0x800000
+
+static ssize_t gunzip(void *dst, size_t dstlen, uint8_t *src,
+                      size_t srclen)
+{
+    z_stream s;
+    ssize_t dstbytes;
+    int r, i, flags;
+
+    /* skip header */
+    i = 10;
+    flags = src[3];
+    if (src[2] != DEFLATED || (flags & RESERVED) != 0) {
+        puts ("Error: Bad gzipped data\n");
+        return -1;
+    }
+    if ((flags & EXTRA_FIELD) != 0)
+        i = 12 + src[10] + (src[11] << 8);
+    if ((flags & ORIG_NAME) != 0)
+        while (src[i++] != 0)
+            ;
+    if ((flags & COMMENT) != 0)
+        while (src[i++] != 0)
+            ;
+    if ((flags & HEAD_CRC) != 0)
+        i += 2;
+    if (i >= srclen) {
+        puts ("Error: gunzip out of data in header\n");
+        return -1;
+    }
+
+    s.zalloc = zalloc;
+    s.zfree = zfree;
+
+    r = inflateInit2(&s, -MAX_WBITS);
+    if (r != Z_OK) {
+        printf ("Error: inflateInit2() returned %d\n", r);
+        return (-1);
+    }
+    s.next_in = src + i;
+    s.avail_in = srclen - i;
+    s.next_out = dst;
+    s.avail_out = dstlen;
+    r = inflate(&s, Z_FINISH);
+    if (r != Z_OK && r != Z_STREAM_END) {
+        printf ("Error: inflate() returned %d\n", r);
+        return -1;
+    }
+    dstbytes = s.next_out - (unsigned char *) dst;
+    inflateEnd(&s);
+
+    return dstbytes;
+}
+
+/* Load a U-Boot image.  */
+int load_uimage(const char *filename, target_phys_addr_t *ep,
+                target_phys_addr_t *loadaddr, int *is_linux)
+{
+    int fd;
+    int size;
+    uboot_image_header_t h;
+    uboot_image_header_t *hdr = &h;
+    uint8_t *data = NULL;
+    int ret = -1;
+
+    fd = open(filename, O_RDONLY | O_BINARY);
+    if (fd < 0)
+        return -1;
+
+    size = read(fd, hdr, sizeof(uboot_image_header_t));
+    if (size < 0)
+        goto out;
+
+    bswap_uboot_header(hdr);
+
+    if (hdr->ih_magic != IH_MAGIC)
+        goto out;
+
+    /* TODO: Implement other image types.  */
+    if (hdr->ih_type != IH_TYPE_KERNEL) {
+        fprintf(stderr, "Can only load u-boot image type \"kernel\"\n");
+        goto out;
+    }
+
+    switch (hdr->ih_comp) {
+    case IH_COMP_NONE:
+    case IH_COMP_GZIP:
+        break;
+    default:
+        fprintf(stderr,
+                "Unable to load u-boot images with compression type %d\n",
+                hdr->ih_comp);
+        goto out;
+    }
+
+    /* TODO: Check CPU type.  */
+    if (is_linux) {
+        if (hdr->ih_os == IH_OS_LINUX)
+            *is_linux = 1;
+        else
+            *is_linux = 0;
+    }
+
+    *ep = hdr->ih_ep;
+    data = qemu_malloc(hdr->ih_size);
+
+    if (read(fd, data, hdr->ih_size) != hdr->ih_size) {
+        fprintf(stderr, "Error reading file\n");
+        goto out;
+    }
+
+    if (hdr->ih_comp == IH_COMP_GZIP) {
+        uint8_t *compressed_data;
+        size_t max_bytes;
+        ssize_t bytes;
+
+        compressed_data = data;
+        max_bytes = UBOOT_MAX_GUNZIP_BYTES;
+        data = qemu_malloc(max_bytes);
+
+        bytes = gunzip(data, max_bytes, compressed_data, hdr->ih_size);
+        qemu_free(compressed_data);
+        if (bytes < 0) {
+            fprintf(stderr, "Unable to decompress gzipped image!\n");
+            goto out;
+        }
+        hdr->ih_size = bytes;
+    }
+
+    cpu_physical_memory_write_rom(hdr->ih_load, data, hdr->ih_size);
+
+    if (loadaddr)
+        *loadaddr = hdr->ih_load;
+
+    ret = hdr->ih_size;
+
+out:
+    if (data)
+        qemu_free(data);
+    close(fd);
+    return ret;
+}