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-rw-r--r--arch/x86/boot/compressed/head_32.S2
-rw-r--r--arch/x86/boot/compressed/head_64.S2
-rw-r--r--arch/x86/boot/compressed/misc.c18
3 files changed, 13 insertions, 9 deletions
diff --git a/arch/x86/boot/compressed/head_32.S b/arch/x86/boot/compressed/head_32.S
index 6589ddd4cfaf..987ae727cf9f 100644
--- a/arch/x86/boot/compressed/head_32.S
+++ b/arch/x86/boot/compressed/head_32.S
@@ -187,7 +187,7 @@ SYM_FUNC_START_LOCAL_NOALIGN(.Lrelocated)
leal boot_heap@GOTOFF(%ebx), %eax
pushl %eax /* heap area */
pushl %esi /* real mode pointer */
- call extract_kernel /* returns kernel location in %eax */
+ call extract_kernel /* returns kernel entry point in %eax */
addl $24, %esp
/*
diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S
index a75712991df3..03c4328a88cb 100644
--- a/arch/x86/boot/compressed/head_64.S
+++ b/arch/x86/boot/compressed/head_64.S
@@ -569,7 +569,7 @@ SYM_FUNC_START_LOCAL_NOALIGN(.Lrelocated)
movl input_len(%rip), %ecx /* input_len */
movq %rbp, %r8 /* output target address */
movl output_len(%rip), %r9d /* decompressed length, end of relocs */
- call extract_kernel /* returns kernel location in %rax */
+ call extract_kernel /* returns kernel entry point in %rax */
popq %rsi
/*
diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c
index cf690d8712f4..014ff222bf4b 100644
--- a/arch/x86/boot/compressed/misc.c
+++ b/arch/x86/boot/compressed/misc.c
@@ -277,7 +277,7 @@ static inline void handle_relocations(void *output, unsigned long output_len,
{ }
#endif
-static void parse_elf(void *output)
+static size_t parse_elf(void *output)
{
#ifdef CONFIG_X86_64
Elf64_Ehdr ehdr;
@@ -293,10 +293,8 @@ static void parse_elf(void *output)
if (ehdr.e_ident[EI_MAG0] != ELFMAG0 ||
ehdr.e_ident[EI_MAG1] != ELFMAG1 ||
ehdr.e_ident[EI_MAG2] != ELFMAG2 ||
- ehdr.e_ident[EI_MAG3] != ELFMAG3) {
+ ehdr.e_ident[EI_MAG3] != ELFMAG3)
error("Kernel is not a valid ELF file");
- return;
- }
debug_putstr("Parsing ELF... ");
@@ -328,6 +326,8 @@ static void parse_elf(void *output)
}
free(phdrs);
+
+ return ehdr.e_entry - LOAD_PHYSICAL_ADDR;
}
/*
@@ -356,6 +356,7 @@ asmlinkage __visible void *extract_kernel(void *rmode, memptr heap,
const unsigned long kernel_total_size = VO__end - VO__text;
unsigned long virt_addr = LOAD_PHYSICAL_ADDR;
unsigned long needed_size;
+ size_t entry_offset;
/* Retain x86 boot parameters pointer passed from startup_32/64. */
boot_params = rmode;
@@ -456,14 +457,17 @@ asmlinkage __visible void *extract_kernel(void *rmode, memptr heap,
debug_putstr("\nDecompressing Linux... ");
__decompress(input_data, input_len, NULL, NULL, output, output_len,
NULL, error);
- parse_elf(output);
+ entry_offset = parse_elf(output);
handle_relocations(output, output_len, virt_addr);
- debug_putstr("done.\nBooting the kernel.\n");
+
+ debug_putstr("done.\nBooting the kernel (entry_offset: 0x");
+ debug_puthex(entry_offset);
+ debug_putstr(").\n");
/* Disable exception handling before booting the kernel */
cleanup_exception_handling();
- return output;
+ return output + entry_offset;
}
void fortify_panic(const char *name)