--- /dev/null
+/*
+ * Copyright (C) 2001-2002 Hewlett-Packard Co.
+ * Contributed by Stephane Eranian <eranian@hpl.hp.com>
+ *
+ * Copyright (C) 2001 Silicon Graphics, Inc.
+ * Contributed by Brent Casavant <bcasavan@sgi.com>
+ *
+ * Copyright (C) 2006-2009 Intel Corporation
+ * Contributed by Fenghua Yu <fenghua.yu@intel.com>
+ * Contributed by Bibo Mao <bibo.mao@intel.com>
+ * Contributed by Chandramouli Narayanan <mouli@linux.intel.com>
+ *
+ * This file is part of the ELILO, the EFI Linux boot loader.
+ *
+ * ELILO 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, or (at your option)
+ * any later version.
+ *
+ * ELILO 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 ELILO; see the file COPYING. If not, write to the Free
+ * Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ *
+ * Please check out the elilo.txt for complete documentation on how
+ * to use this program.
+ */
+
+#include <efi.h>
+#include <efilib.h>
+
+#include "elf.h"
+#include "elilo.h"
+#include "gzip.h"
+#include "private.h"
+
+#define memzero(s, n) Memset((VOID *)(s), 0, (n))
+#define memcpy(a,b,n) Memcpy((VOID *)(a),(b),(n))
+
+/* size of output buffer */
+#define WSIZE 0x8000 /* Window size must be at least 32k, */
+ /* and a power of two */
+/* size of input buffer */
+#define INBUFSIZE 0x8000
+
+/*
+ * gzip declarations
+ */
+
+#define OF(args) args
+#define FUNC_STATIC static
+
+typedef unsigned char uch;
+typedef unsigned short ush;
+typedef unsigned long ulg;
+
+
+typedef struct segment {
+ unsigned long addr; /* start address */
+ unsigned long offset; /* file offset */
+ unsigned long size; /* file size */
+ unsigned long bss_sz; /* BSS size */
+ UINT8 flags; /* indicates whether to load or not */
+} segment_t;
+
+#define CHUNK_FL_VALID 0x1
+#define CHUNK_FL_LOAD 0x2
+
+#define CHUNK_CAN_LOAD(n) chunks[(n)].flags |= CHUNK_FL_LOAD
+#define CHUNK_NO_LOAD(n) chunks[(n)].flags &= ~CHUNK_FL_LOAD
+#define CHUNK_IS_LOAD(n) (chunks[(n)].flags & CHUNK_FL_LOAD)
+
+#define CHUNK_VALIDATE(n) chunks[(n)].flags |= CHUNK_FL_VALID
+#define CHUNK_INVALIDATE(n) chunks[(n)].flags = 0
+#define CHUNK_IS_VALID(n) (chunks[(n)].flags & CHUNK_FL_VALID)
+
+/*
+ * static parameters to gzip helper functions
+ * we cannot use paramters because API was not
+ * designed that way
+ */
+static segment_t *chunks; /* holds the list of segments */
+static segment_t *cur_chunk;
+static UINTN nchunks;
+static UINTN chunk; /* current segment */
+static UINTN input_fd;
+static VOID *kernel_entry, *kernel_base, *kernel_end;
+
+static uch *inbuf; /* input buffer (compressed data) */
+static uch *window; /* output buffer (uncompressed data) */
+static unsigned long file_offset; /* position in the file */
+
+static unsigned insize = 0; /* valid bytes in inbuf */
+static unsigned inptr = 0; /* index of next byte to be processed in inbuf */
+static unsigned outcnt = 0; /* bytes in output buffer */
+
+/* gzip flag byte */
+#define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */
+#define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
+#define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
+#define ORIG_NAME 0x08 /* bit 3 set: original file name present */
+#define COMMENT 0x10 /* bit 4 set: file comment present */
+#define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
+#define RESERVED 0xC0 /* bit 6,7: reserved */
+
+#define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf())
+
+/* Diagnostic functions */
+#ifdef INFLATE_DEBUG
+# define Assert(cond,msg) {if(!(cond)) error(msg);}
+int stderr;
+# define Trace(x) Print(L"line %d:\n", __LINE__);
+# define Tracev(x) {if (verbose) Print(L"line %d:\n", __LINE__) ;}
+# define Tracevv(x) {if (verbose>1) Print(L"line %d:\n", __LINE__) ;}
+# define Tracec(c,x) {if (verbose && (c)) Print(L"line %d:\n", __LINE__) ;}
+# define Tracecv(c,x) {if (verbose>1 && (c)) Print(L"line %d:\n", __LINE__) ;}
+#else
+# define Assert(cond,msg)
+# define Trace(x)
+# define Tracev(x)
+# define Tracevv(x)
+# define Tracec(c,x)
+# define Tracecv(c,x)
+#endif
+
+static int fill_inbuf(void);
+static void flush_window(void);
+static void error(char *m);
+static long bytes_out;
+static void error(char *m);
+static int error_return;
+
+static void *
+gzip_malloc(int size)
+{
+ return (void *)alloc(size, 0);
+}
+
+static void
+gzip_free(void *where)
+{
+ return free(where);
+}
+
+#include "inflate.c"
+
+/*
+ * Fill the input buffer and return the first byte in it. This is called
+ * only when the buffer is empty and at least one byte is really needed.
+ */
+int
+fill_inbuf(void)
+{
+ INTN expected, nread;
+ EFI_STATUS status;
+
+ expected = nread = INBUFSIZE;
+
+ status = fops_read(input_fd, inbuf, &nread);
+ if (EFI_ERROR(status)) {
+ error("elilo: Read failed");
+ }
+ DBG_PRT((L"%s : read %d bytes of %d bytes\n", LD_NAME, nread, expected));
+
+ insize = nread;
+ inptr = 1;
+
+ return inbuf[0];
+}
+
+/* ===========================================================================
+ * Write the output window window[0..outcnt-1] and update crc and bytes_out.
+ * (Used for the decompressed data only.)
+ */
+
+/*
+ * Run a set of bytes through the crc shift register. If s is a NULL
+ * pointer, then initialize the crc shift register contents instead.
+ * Return the current crc in either case.
+ *
+ * Input:
+ * S pointer to bytes to pump through.
+ * N number of bytes in S[].
+ */
+unsigned long
+updcrc(unsigned char *s, unsigned n)
+{
+ register unsigned long c;
+ /* crc is defined in inflate.c */
+
+ if (!s) {
+ c = 0xffffffffL;
+ } else {
+ c = crc;
+ while (n--) {
+ c = crc_32_tab[((int)c ^ (*s++)) & 0xff] ^ (c >> 8);
+ }
+ }
+ crc = c;
+ return c ^ 0xffffffffUL; /* (instead of ~c for 64-bit machines) */
+}
+
+
+/*
+ * Clear input and output buffers
+ */
+void
+clear_bufs(void)
+{
+ outcnt = 0;
+ inptr = 0;
+ chunk = 0;
+ cur_chunk = NULL;
+ file_offset = 0;
+}
+
+
+static INTN
+is_valid_header(Elf64_Ehdr *ehdr)
+{
+ UINT16 type, machine;
+
+ type = ehdr->e_type;
+ machine = ehdr->e_machine;
+
+ VERB_PRT(3, Print(L"class=%d type=%d data=%d machine=%d\n",
+ ehdr->e_ident[EI_CLASS],
+ type,
+ ehdr->e_ident[EI_DATA],
+ machine));
+
+ return ehdr->e_ident[EI_MAG0] == 0x7f
+ && ehdr->e_ident[EI_MAG1] == 'E'
+ && ehdr->e_ident[EI_MAG2] == 'L'
+ && ehdr->e_ident[EI_MAG3] == 'F'
+ && ehdr->e_ident[EI_CLASS] == ELFCLASS64
+ && type == ET_EXEC /* must be executable */
+ && machine == EM_X86_64 ? 0 : -1;
+}
+
+/*
+ * will invalidate loadble segments which overlap with others
+ */
+void
+check_overlap(int i)
+{
+ int j;
+ unsigned long iend = chunks[i].addr + chunks[i].size;
+
+ for(j=0; j < nchunks; j++) {
+ if (j ==i) continue;
+ if (chunks[i].addr >= chunks[j].addr && iend < (chunks[j].addr + chunks[j].size)) {
+ DBG_PRT((L"%s : segment %d fully included in segment %d\n", LD_NAME, i, j));
+ CHUNK_INVALIDATE(i); /* nullyify segment */
+ break;
+ }
+ }
+}
+
+void
+analyze_chunks(void)
+{
+ INTN i;
+
+ for (i=0; i < nchunks; i++) {
+ if (CHUNK_IS_VALID(i) && !CHUNK_IS_LOAD(i))
+ check_overlap(i);
+ }
+}
+
+
+/*
+ * The decompression code calls this function after decompressing the
+ * first block of the object file. The first block must contain all
+ * the relevant header information.
+ */
+int
+first_block (const char *buf, long blocksize)
+{
+ Elf64_Ehdr *elf;
+ Elf64_Phdr *phdrs;
+ UINTN total_size, pages;
+ UINTN low_addr, max_addr;
+ UINTN offs = 0;
+ UINT16 phnum;
+ UINTN paddr, memsz;
+ INTN i;
+
+ elf = (Elf64_Ehdr *)buf;
+
+ if (is_valid_header(elf) == -1)
+ return -1;
+
+ offs = elf->e_phoff;
+ phnum = elf->e_phnum;
+
+ VERB_PRT(3, {
+ Print(L"Entry point 0x%lx\n", elf->e_entry);
+ Print(L"%d program headers\n", phnum);
+ Print(L"%d segment headers\n", elf->e_shnum);
+ });
+
+ if (offs + phnum * sizeof(*phdrs) > (unsigned) blocksize) {
+ ERR_PRT((L"%s : ELF program headers not in first block (%ld)\n", LD_NAME, offs));
+ return -1;
+ }
+
+ kernel_entry = (VOID *)(elf->e_entry & PADDR_MASK);
+
+ phdrs = (Elf64_Phdr *) (buf + offs);
+ low_addr = ~0;
+ max_addr = 0;
+
+ /*
+ * allocate chunk table
+ * Convention: a segment that does not need loading will
+ * have chunk[].addr = 0.
+ */
+ chunks = (void *)alloc(sizeof(struct segment)*phnum, 0);
+ if (chunks == NULL) {
+ ERR_PRT((L"%s : failed alloc chunks %r\n", LD_NAME));
+ return -1;
+ }
+ nchunks = phnum;
+ /*
+ * find lowest and higest virtual addresses
+ * don't assume FULLY sorted !
+ */
+ for (i = 0; i < phnum; ++i) {
+ /*
+ * record chunk no matter what because no load may happen
+ * anywhere in archive, not just as the last segment
+ */
+ paddr = (phdrs[i].p_paddr & PADDR_MASK);
+ memsz = phdrs[i].p_memsz,
+
+ chunks[i].addr = paddr;
+ chunks[i].offset = phdrs[i].p_offset;
+ chunks[i].size = phdrs[i].p_filesz;
+ chunks[i].bss_sz = phdrs[i].p_memsz - phdrs[i].p_filesz;
+
+ CHUNK_VALIDATE(i);
+
+ if (phdrs[i].p_type != PT_LOAD) {
+ CHUNK_NO_LOAD(i); /* mark no load chunk */
+ DBG_PRT((L"%s : skipping segment %ld\n", LD_NAME, i));
+ continue;
+ }
+
+ CHUNK_CAN_LOAD(i); /* mark no load chunk */
+
+ VERB_PRT(3,
+ Print(L"\n%s : segment %ld vaddr [0x%lx-0x%lx] offset %ld filesz %ld "
+ "memsz=%ld bss_sz=%ld\n",
+ LD_NAME, 1+i, chunks[i].addr, chunks[i].addr+phdrs[i].p_filesz,
+ chunks[i].offset, chunks[i].size, memsz, chunks[i].bss_sz));
+
+ if (paddr < low_addr)
+ low_addr = paddr;
+ if (paddr + memsz > max_addr)
+ max_addr = paddr + memsz;
+ }
+
+ if (low_addr & (EFI_PAGE_SIZE - 1)) {
+ ERR_PRT((L"%s : low_addr not page aligned 0x%lx\n", LD_NAME, low_addr));
+ goto error;
+ }
+ analyze_chunks();
+
+ DBG_PRT((L"%s : %d program headers entry=0x%lx\nlowest_addr=0x%lx highest_addr=0x%lx\n",
+ LD_NAME,
+ phnum, kernel_entry, low_addr, max_addr));
+
+ total_size = (UINTN)max_addr - (UINTN)low_addr;
+ pages = EFI_SIZE_TO_PAGES(total_size);
+
+ /*
+ * Record end of kernel for initrd
+ */
+ kernel_base = (void *)low_addr;
+ kernel_end = (void *)(low_addr + (pages << EFI_PAGE_SHIFT));
+
+ /* allocate memory for the kernel */
+ if (alloc_kmem((void *)low_addr, pages) == -1) {
+ ERR_PRT((L"%s : AllocatePages(%d, 0x%lx) for kernel failed\n",
+ LD_NAME, pages, low_addr));
+ ERR_PRT((L"%s : Could not load kernel at 0x%lx\n", LD_NAME, low_addr));
+ ERR_PRT((L"%s : Bailing\n", LD_NAME));
+ goto error;
+ }
+ return 0;
+error:
+ if (chunks)
+ free(chunks);
+ return -1;
+}
+
+/*
+ * Determine which chunk in the Elf file will be coming out of the expand
+ * code next.
+ */
+static void
+nextchunk(void)
+{
+ int i;
+ segment_t *cp;
+
+ cp = NULL;
+ for(i=0; i < nchunks; i++) {
+
+ if (!CHUNK_IS_VALID(i) || !CHUNK_IS_LOAD(i)) continue;
+
+ if (file_offset > chunks[i].offset) continue;
+
+ if (cp == NULL || chunks[i].offset < cp->offset) cp = &chunks[i];
+ }
+ cur_chunk = cp;
+}
+
+
+/*
+ * Write the output window window[0..outcnt-1] holding uncompressed
+ * data and update crc.
+ */
+void
+flush_window(void)
+{
+ static const CHAR8 helicopter[4] = { '|' , '/' , '-' , '\\' };
+ static UINTN heli_count;
+ struct segment *cp;
+ char *src, *dst;
+ long cnt;
+
+ if (!outcnt) return;
+
+ DBG_PRT((L"%s : flush_window outnct=%d file_offset=%ld\n", LD_NAME, outcnt, file_offset));
+
+ Print(L"%c\b",helicopter[heli_count++%4]);
+
+ updcrc(window, outcnt);
+
+ /* first time, we extract the headers */
+ if (!bytes_out) {
+ if (first_block(window, outcnt) < 0)
+ error("invalid exec header");
+ nextchunk();
+ }
+
+ bytes_out += outcnt;
+ src = window;
+tail:
+ /* check if user wants to abort */
+ if (check_abort() == EFI_SUCCESS) goto load_abort;
+
+ cp = cur_chunk;
+ if (cp == NULL || file_offset + outcnt <= cp->offset) {
+ file_offset += outcnt;
+ return;
+ }
+
+ /* Does this window begin before the current chunk? */
+ if (file_offset < cp->offset) {
+ unsigned long skip = cp->offset - file_offset;
+
+ src += skip;
+ file_offset += skip;
+ outcnt -= skip;
+ }
+ dst = (char *)cp->addr + (file_offset - cp->offset);
+ cnt = cp->offset + cp->size - file_offset;
+ if (cnt > outcnt)
+ cnt = outcnt;
+
+ Memcpy(dst, src, cnt);
+
+ file_offset += cnt;
+ outcnt -= cnt;
+ src += cnt;
+
+ /* See if we are at the end of this chunk */
+ if (file_offset == cp->offset + cp->size) {
+ if (cp->bss_sz) {
+ dst = (char *)cp->addr + cp->size;
+ Memset(dst, 0, cp->bss_sz);
+ }
+ nextchunk();
+ /* handle remaining bytes */
+ if (outcnt)
+ goto tail;
+ }
+ return;
+load_abort:
+ free_kmem();
+ error_return = ELILO_LOAD_ABORTED;
+}
+
+static void
+error(char *x)
+{
+ ERR_PRT((L"%s : %a", LD_NAME, x));
+ /* will eventually exit with error from gunzip() */
+}
+
+INT32
+decompress_kernel(VOID)
+{
+ INT32 ret;
+
+ clear_bufs();
+ makecrc();
+ Print(L"Uncompressing Linux... ");
+ ret = gunzip();
+ if (ret == 0)
+ Print(L"done\n");
+ return ret == 0 ? 0 : -1;
+}
+
+int
+gunzip_kernel(fops_fd_t fd, kdesc_t *kd)
+{
+ int ret = -1;
+
+ error_return = ELILO_LOAD_ERROR;
+
+ window = (void *)alloc(WSIZE, 0);
+ if (window == NULL) {
+ ERR_PRT((L"%s : allocate output window failed\n", LD_NAME));
+ return -1;
+ }
+
+ inbuf = (void *)alloc(INBUFSIZE, 0);
+ if (inbuf == NULL) {
+ ERR_PRT((L"%s : allocate input window failedr\n", LD_NAME));
+ goto error;
+ }
+ input_fd = fd;
+ insize = 0;
+ bytes_out = 0;
+
+ ret = decompress_kernel();
+error:
+ if (window) free(window);
+ if (inbuf) free(inbuf);
+
+ if (ret == 0) {
+ kd->kentry = kernel_entry;
+ kd->kend = kernel_end;
+ kd->kstart = kernel_base;
+ error_return = ELILO_LOAD_SUCCESS;
+ }
+ return error_return;
+}
projects / debian / elilo / blobdiff