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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] hvmloader: Fix ROMBIOS highmem relocation. Only SHF_ALLOC sections
# HG changeset patch
# User Keir Fraser <keir@xxxxxxxxxxxxx>
# Date 1177013189 -3600
# Node ID c7c67a1a70777b934cba17d01b7437558ef4f336
# Parent 56fa8b1f8e08b5186ad8110881f779cb13a34190
hvmloader: Fix ROMBIOS highmem relocation. Only SHF_ALLOC sections
should be relocated. SHT_NOBITS must be handled properly (space
explicitly allocated and zeroed).
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
---
tools/firmware/rombios/32bit/jumptable.h | 11 -
tools/firmware/hvmloader/32bitbios_support.c | 157 +++++++++++++++------------
tools/firmware/hvmloader/util.c | 13 +-
tools/firmware/hvmloader/util.h | 3
tools/firmware/rombios/32bit/32bitbios.c | 3
5 files changed, 102 insertions(+), 85 deletions(-)
diff -r 56fa8b1f8e08 -r c7c67a1a7077
tools/firmware/hvmloader/32bitbios_support.c
--- a/tools/firmware/hvmloader/32bitbios_support.c Thu Apr 19 19:32:10
2007 +0100
+++ b/tools/firmware/hvmloader/32bitbios_support.c Thu Apr 19 21:06:29
2007 +0100
@@ -3,6 +3,9 @@
*
* Stefan Berger, stefanb@xxxxxxxxxx
* Copyright (c) 2006, International Business Machines Corporation.
+ *
+ * Keir Fraser, keir@xxxxxxxxxxxxx
+ * Copyright (c) 2007, XenSource Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
@@ -28,24 +31,94 @@
#include "config.h"
#include "../rombios/32bit/32bitbios_flat.h"
-#include "../rombios/32bit/jumptable.h"
-/* Relocate ELF file of type ET_REL */
-static void relocate_elf(char *elfarray)
+static void relocate_32bitbios(char *elfarray, uint32_t elfarraysize)
{
Elf32_Ehdr *ehdr = (Elf32_Ehdr *)elfarray;
Elf32_Shdr *shdr = (Elf32_Shdr *)&elfarray[ehdr->e_shoff];
- Elf32_Sym *syms, *sym;
- Elf32_Rel *rels;
- char *code;
- uint32_t *loc, fix;
- int i, j;
+ char *secstrings = &elfarray[shdr[ehdr->e_shstrndx].sh_offset];
+ char *jump_table;
+ uint32_t reloc_off, reloc_size;
+ char *highbiosarea;
+ int i, jump_sec_idx = 0;
+ /*
+ * Step 1. General elf cleanup, and compute total relocation size.
+ */
+ reloc_off = 0;
for ( i = 0; i < ehdr->e_shnum; i++ )
+ {
+ /* By default all section data points into elf image data array. */
shdr[i].sh_addr = (Elf32_Addr)&elfarray[shdr[i].sh_offset];
+ if ( !strcmp(".biosjumptable", secstrings + shdr[i].sh_name) )
+ {
+ /* We do not relocate the BIOS jump table to high memory. */
+ shdr[i].sh_flags &= ~SHF_ALLOC;
+ jump_sec_idx = i;
+ }
+
+ /* Fix up a corner case of address alignment. */
+ if ( shdr[i].sh_addralign == 0 )
+ shdr[i].sh_addralign = 1;
+
+ /* Any section which contains run-time data must be relocated. */
+ if ( shdr[i].sh_flags & SHF_ALLOC )
+ {
+ uint32_t mask = shdr[i].sh_addralign - 1;
+ reloc_off = (reloc_off + mask) & ~mask;
+ reloc_off += shdr[i].sh_size;
+ }
+ }
+
+ /*
+ * Step 2. Now we know the relocation size, allocate a chunk of high mem.
+ */
+ reloc_size = reloc_off;
+ printf("%d bytes of ROMBIOS high-memory extensions:\n", reloc_size);
+ highbiosarea = (char *)(long)e820_malloc(reloc_size);
+ BUG_ON(highbiosarea == NULL);
+ printf(" Relocating to 0x%x-0x%x ... ",
+ (uint32_t)&highbiosarea[0],
+ (uint32_t)&highbiosarea[reloc_size]);
+
+ /*
+ * Step 3. Copy run-time data into the newly-allocated high-memory chunk.
+ */
+ reloc_off = 0;
for ( i = 0; i < ehdr->e_shnum; i++ )
{
+ uint32_t mask = shdr[i].sh_addralign - 1;
+
+ /* Nothing to do for non-run-time sections. */
+ if ( !(shdr[i].sh_flags & SHF_ALLOC) )
+ continue;
+
+ /* Copy from old location. */
+ reloc_off = (reloc_off + mask) & ~mask;
+ if ( shdr[i].sh_type == SHT_NOBITS )
+ memset(&highbiosarea[reloc_off], 0, shdr[i].sh_size);
+ else
+ memcpy(&highbiosarea[reloc_off], (void *)shdr[i].sh_addr,
+ shdr[i].sh_size);
+
+ /* Update address to new location. */
+ shdr[i].sh_addr = (Elf32_Addr)&highbiosarea[reloc_off];
+ reloc_off += shdr[i].sh_size;
+ }
+ BUG_ON(reloc_off != reloc_size);
+
+ /*
+ * Step 4. Perform relocations in high memory.
+ */
+ for ( i = 0; i < ehdr->e_shnum; i++ )
+ {
+ Elf32_Sym *syms, *sym;
+ Elf32_Rel *rels;
+ char *code;
+ uint32_t *loc, fix;
+ int j;
+
if ( shdr[i].sh_type == SHT_RELA )
printf("Unsupported section type SHT_RELA\n");
@@ -74,65 +147,19 @@ static void relocate_elf(char *elfarray)
}
}
}
-}
-/* Scan the rombios for the destination of the jump table. */
-static char *get_jump_table_start(void)
-{
- char *bios_mem;
+ /* Step 5. Find the ROMBIOS jump-table stub and copy in the real table. */
+ for ( jump_table = (char *)ROMBIOS_BEGIN;
+ jump_table != (char *)ROMBIOS_END;
+ jump_table++ )
+ if ( !strncmp(jump_table, "___JMPT", 7) )
+ break;
+ BUG_ON(jump_table == NULL);
+ BUG_ON(jump_sec_idx == 0);
+ memcpy(jump_table, (char *)shdr[jump_sec_idx].sh_addr,
+ shdr[jump_sec_idx].sh_size);
- for ( bios_mem = (char *)ROMBIOS_BEGIN;
- bios_mem != (char *)ROMBIOS_END;
- bios_mem++ )
- if ( !strncmp(bios_mem, "___JMPT", 7) )
- return bios_mem;
-
- return NULL;
-}
-
-/* Copy relocated jumptable into the rombios. */
-static void copy_jumptable(char *elfarray)
-{
- Elf32_Ehdr *ehdr = (Elf32_Ehdr *)elfarray;
- Elf32_Shdr *shdr = (Elf32_Shdr *)&elfarray[ehdr->e_shoff];
- char *secstrings = &elfarray[shdr[ehdr->e_shstrndx].sh_offset];
- char *jump_table = get_jump_table_start();
- int i;
-
- /* Find the section with the jump table and copy to lower BIOS memory. */
- for ( i = 0; i < ehdr->e_shnum; i++ )
- if ( !strcmp(JUMPTABLE_SECTION_NAME, secstrings + shdr[i].sh_name) )
- break;
-
- if ( i == ehdr->e_shnum )
- {
- printf("Could not find " JUMPTABLE_SECTION_NAME " section in file.\n");
- return;
- }
-
- if ( jump_table == NULL )
- {
- printf("Could not find jump table in file.\n");
- return;
- }
-
- memcpy(jump_table, (char *)shdr[i].sh_addr, shdr[i].sh_size);
-}
-
-static void relocate_32bitbios(char *elfarray, uint32_t elfarraysize)
-{
- char *highbiosarea;
-
- highbiosarea = (char *)(long)e820_malloc(elfarraysize);
- if ( highbiosarea == NULL )
- {
- printf("No available memory for BIOS high memory area\n");
- return;
- }
-
- memcpy(highbiosarea, elfarray, elfarraysize);
- relocate_elf(highbiosarea);
- copy_jumptable(highbiosarea);
+ printf("done\n");
}
void highbios_setup(void)
diff -r 56fa8b1f8e08 -r c7c67a1a7077 tools/firmware/hvmloader/util.c
--- a/tools/firmware/hvmloader/util.c Thu Apr 19 19:32:10 2007 +0100
+++ b/tools/firmware/hvmloader/util.c Thu Apr 19 21:06:29 2007 +0100
@@ -335,12 +335,13 @@ uint32_t e820_malloc(uint32_t size)
ent[i].addr = addr;
ent[i].size = size;
ent[i].type = E820_RESERVED;
- break;
- }
-
- e820_collapse();
-
- return addr;
+
+ e820_collapse();
+
+ return addr;
+ }
+
+ return 0;
}
uint32_t ioapic_read(uint32_t reg)
diff -r 56fa8b1f8e08 -r c7c67a1a7077 tools/firmware/hvmloader/util.h
--- a/tools/firmware/hvmloader/util.h Thu Apr 19 19:32:10 2007 +0100
+++ b/tools/firmware/hvmloader/util.h Thu Apr 19 21:06:29 2007 +0100
@@ -14,7 +14,8 @@ extern void __assert_failed(char *assert
#define ASSERT(p) \
do { if (!(p)) __assert_failed(#p, __FILE__, __LINE__); } while (0)
extern void __bug(char *file, int line) __attribute__((noreturn));
-#define BUG() __bug()
+#define BUG() __bug(__FILE__, __LINE__)
+#define BUG_ON(p) do { if (p) BUG(); } while (0)
/* I/O output */
void outb(uint16_t addr, uint8_t val);
diff -r 56fa8b1f8e08 -r c7c67a1a7077 tools/firmware/rombios/32bit/32bitbios.c
--- a/tools/firmware/rombios/32bit/32bitbios.c Thu Apr 19 19:32:10 2007 +0100
+++ b/tools/firmware/rombios/32bit/32bitbios.c Thu Apr 19 21:06:29 2007 +0100
@@ -20,7 +20,6 @@
* Author: Stefan Berger <stefanb@xxxxxxxxxx>
*/
#include "rombios_compat.h"
-#include "jumptable.h"
#include "32bitprotos.h"
/*
@@ -29,7 +28,7 @@
here.
*/
#define TABLE_ENTRY(idx, func) [idx] = (uint32_t)func
-uint32_t jumptable[IDX_LAST+1] __attribute__((section
(JUMPTABLE_SECTION_NAME))) =
+uint32_t jumptable[IDX_LAST+1] __attribute__((section (".biosjumptable"))) =
{
TABLE_ENTRY(IDX_TCPA_ACPI_INIT, tcpa_acpi_init),
TABLE_ENTRY(IDX_TCPA_EXTEND_ACPI_LOG, tcpa_extend_acpi_log),
diff -r 56fa8b1f8e08 -r c7c67a1a7077 tools/firmware/rombios/32bit/jumptable.h
--- a/tools/firmware/rombios/32bit/jumptable.h Thu Apr 19 19:32:10 2007 +0100
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,11 +0,0 @@
-#ifndef JUMPTABLE_H
-#define JUMPTABLE_H
-
-/*
- name of the section the 32bit BIOS must have and where the array of
- function poiners is built; hvmloader looks for this section and copies
- it into the lower BIOS in the 0xf000 segment
- */
-#define JUMPTABLE_SECTION_NAME ".biosjumptable"
-
-#endif
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