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-rw-r--r--arch/arm/boot/compressed/Makefile19
-rw-r--r--arch/arm/boot/compressed/decompress.c4
-rw-r--r--arch/arm/boot/compressed/head.S57
-rw-r--r--arch/arm/boot/compressed/misc.c24
-rw-r--r--arch/arm/boot/compressed/vmlinux.lds.in1
5 files changed, 70 insertions, 35 deletions
diff --git a/arch/arm/boot/compressed/Makefile b/arch/arm/boot/compressed/Makefile
index 8ebbb511c783..23aad0722303 100644
--- a/arch/arm/boot/compressed/Makefile
+++ b/arch/arm/boot/compressed/Makefile
@@ -74,7 +74,7 @@ ZTEXTADDR := $(CONFIG_ZBOOT_ROM_TEXT)
ZBSSADDR := $(CONFIG_ZBOOT_ROM_BSS)
else
ZTEXTADDR := 0
-ZBSSADDR := ALIGN(4)
+ZBSSADDR := ALIGN(8)
endif
SEDFLAGS = s/TEXT_START/$(ZTEXTADDR)/;s/BSS_START/$(ZBSSADDR)/
@@ -98,8 +98,6 @@ endif
ccflags-y := -fpic -fno-builtin
asflags-y := -Wa,-march=all
-# Provide size of uncompressed kernel to the decompressor via a linker symbol.
-LDFLAGS_vmlinux = --defsym _image_size=$(shell stat -c "%s" $(obj)/../Image)
# Supply ZRELADDR to the decompressor via a linker symbol.
ifneq ($(CONFIG_AUTO_ZRELADDR),y)
LDFLAGS_vmlinux += --defsym zreladdr=$(ZRELADDR)
@@ -122,10 +120,23 @@ lib1funcs = $(obj)/lib1funcs.o
$(obj)/lib1funcs.S: $(srctree)/arch/$(SRCARCH)/lib/lib1funcs.S FORCE
$(call cmd,shipped)
+# We need to prevent any GOTOFF relocs being used with references
+# to symbols in the .bss section since we cannot relocate them
+# independently from the rest at run time. This can be achieved by
+# ensuring that no private .bss symbols exist, as global symbols
+# always have a GOT entry which is what we need.
+# The .data section is already discarded by the linker script so no need
+# to bother about it here.
+check_for_bad_syms = \
+bad_syms=$$($(CROSS_COMPILE)nm $@ | sed -n 's/^.\{8\} [bc] \(.*\)/\1/p') && \
+[ -z "$$bad_syms" ] || \
+ ( echo "following symbols must have non local/private scope:" >&2; \
+ echo "$$bad_syms" >&2; rm -f $@; false )
+
$(obj)/vmlinux: $(obj)/vmlinux.lds $(obj)/$(HEAD) $(obj)/piggy.$(suffix_y).o \
$(addprefix $(obj)/, $(OBJS)) $(lib1funcs) FORCE
$(call if_changed,ld)
- @:
+ @$(check_for_bad_syms)
$(obj)/piggy.$(suffix_y): $(obj)/../Image FORCE
$(call if_changed,$(suffix_y))
diff --git a/arch/arm/boot/compressed/decompress.c b/arch/arm/boot/compressed/decompress.c
index 4c72a97bc3e1..07be5a2f8302 100644
--- a/arch/arm/boot/compressed/decompress.c
+++ b/arch/arm/boot/compressed/decompress.c
@@ -44,7 +44,7 @@ extern void error(char *);
#include "../../../../lib/decompress_unlzma.c"
#endif
-void do_decompress(u8 *input, int len, u8 *output, void (*error)(char *x))
+int do_decompress(u8 *input, int len, u8 *output, void (*error)(char *x))
{
- decompress(input, len, NULL, NULL, output, NULL, error);
+ return decompress(input, len, NULL, NULL, output, NULL, error);
}
diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S
index a36f4526689b..c363458a4e63 100644
--- a/arch/arm/boot/compressed/head.S
+++ b/arch/arm/boot/compressed/head.S
@@ -179,16 +179,29 @@ not_angel:
bl cache_on
restart: adr r0, LC0
- ldmia r0, {r1, r2, r3, r5, r6, r9, r11, r12}
- ldr sp, [r0, #32]
+ ldmia r0, {r1, r2, r3, r6, r10, r11, r12}
+ ldr sp, [r0, #28]
/*
* We might be running at a different address. We need
* to fix up various pointers.
*/
sub r0, r0, r1 @ calculate the delta offset
- add r5, r5, r0 @ _start
add r6, r6, r0 @ _edata
+ add r10, r10, r0 @ inflated kernel size location
+
+ /*
+ * The kernel build system appends the size of the
+ * decompressed kernel at the end of the compressed data
+ * in little-endian form.
+ */
+ ldrb r9, [r10, #0]
+ ldrb lr, [r10, #1]
+ orr r9, r9, lr, lsl #8
+ ldrb lr, [r10, #2]
+ ldrb r10, [r10, #3]
+ orr r9, r9, lr, lsl #16
+ orr r9, r9, r10, lsl #24
#ifndef CONFIG_ZBOOT_ROM
/* malloc space is above the relocated stack (64k max) */
@@ -206,31 +219,40 @@ restart: adr r0, LC0
/*
* Check to see if we will overwrite ourselves.
* r4 = final kernel address
- * r5 = start of this image
* r9 = size of decompressed image
* r10 = end of this image, including bss/stack/malloc space if non XIP
* We basically want:
- * r4 >= r10 -> OK
- * r4 + image length <= r5 -> OK
+ * r4 - 16k page directory >= r10 -> OK
+ * r4 + image length <= current position (pc) -> OK
*/
+ add r10, r10, #16384
cmp r4, r10
bhs wont_overwrite
add r10, r4, r9
- cmp r10, r5
+ ARM( cmp r10, pc )
+ THUMB( mov lr, pc )
+ THUMB( cmp r10, lr )
bls wont_overwrite
/*
* Relocate ourselves past the end of the decompressed kernel.
- * r5 = start of this image
* r6 = _edata
* r10 = end of the decompressed kernel
* Because we always copy ahead, we need to do it from the end and go
* backward in case the source and destination overlap.
*/
- /* Round up to next 256-byte boundary. */
- add r10, r10, #256
+ /*
+ * Bump to the next 256-byte boundary with the size of
+ * the relocation code added. This avoids overwriting
+ * ourself when the offset is small.
+ */
+ add r10, r10, #((reloc_code_end - restart + 256) & ~255)
bic r10, r10, #255
+ /* Get start of code we want to copy and align it down. */
+ adr r5, restart
+ bic r5, r5, #31
+
sub r9, r6, r5 @ size to copy
add r9, r9, #31 @ rounded up to a multiple
bic r9, r9, #31 @ ... of 32 bytes
@@ -245,6 +267,11 @@ restart: adr r0, LC0
/* Preserve offset to relocated code. */
sub r6, r9, r6
+#ifndef CONFIG_ZBOOT_ROM
+ /* cache_clean_flush may use the stack, so relocate it */
+ add sp, sp, r6
+#endif
+
bl cache_clean_flush
adr r0, BSYM(restart)
@@ -333,12 +360,11 @@ not_relocated: mov r0, #0
LC0: .word LC0 @ r1
.word __bss_start @ r2
.word _end @ r3
- .word _start @ r5
.word _edata @ r6
- .word _image_size @ r9
+ .word input_data_end - 4 @ r10 (inflated size location)
.word _got_start @ r11
.word _got_end @ ip
- .word user_stack_end @ sp
+ .word .L_user_stack_end @ sp
.size LC0, . - LC0
#ifdef CONFIG_ARCH_RPC
@@ -1056,8 +1082,9 @@ memdump: mov r12, r0
#endif
.ltorg
+reloc_code_end:
.align
.section ".stack", "aw", %nobits
-user_stack: .space 4096
-user_stack_end:
+.L_user_stack: .space 4096
+.L_user_stack_end:
diff --git a/arch/arm/boot/compressed/misc.c b/arch/arm/boot/compressed/misc.c
index 2df38263124c..832d37236c59 100644
--- a/arch/arm/boot/compressed/misc.c
+++ b/arch/arm/boot/compressed/misc.c
@@ -26,8 +26,6 @@ unsigned int __machine_arch_type;
#include <linux/linkage.h>
#include <asm/string.h>
-#include <asm/unaligned.h>
-
static void putstr(const char *ptr);
extern void error(char *x);
@@ -139,13 +137,12 @@ void *memcpy(void *__dest, __const void *__src, size_t __n)
}
/*
- * gzip delarations
+ * gzip declarations
*/
extern char input_data[];
extern char input_data_end[];
unsigned char *output_data;
-unsigned long output_ptr;
unsigned long free_mem_ptr;
unsigned long free_mem_end_ptr;
@@ -170,15 +167,15 @@ asmlinkage void __div0(void)
error("Attempting division by 0!");
}
-extern void do_decompress(u8 *input, int len, u8 *output, void (*error)(char *x));
+extern int do_decompress(u8 *input, int len, u8 *output, void (*error)(char *x));
-unsigned long
+void
decompress_kernel(unsigned long output_start, unsigned long free_mem_ptr_p,
unsigned long free_mem_ptr_end_p,
int arch_id)
{
- unsigned char *tmp;
+ int ret;
output_data = (unsigned char *)output_start;
free_mem_ptr = free_mem_ptr_p;
@@ -187,12 +184,11 @@ decompress_kernel(unsigned long output_start, unsigned long free_mem_ptr_p,
arch_decomp_setup();
- tmp = (unsigned char *) (((unsigned long)input_data_end) - 4);
- output_ptr = get_unaligned_le32(tmp);
-
putstr("Uncompressing Linux...");
- do_decompress(input_data, input_data_end - input_data,
- output_data, error);
- putstr(" done, booting the kernel.\n");
- return output_ptr;
+ ret = do_decompress(input_data, input_data_end - input_data,
+ output_data, error);
+ if (ret)
+ error("decompressor returned an error");
+ else
+ putstr(" done, booting the kernel.\n");
}
diff --git a/arch/arm/boot/compressed/vmlinux.lds.in b/arch/arm/boot/compressed/vmlinux.lds.in
index 5309909d7282..ea80abe78844 100644
--- a/arch/arm/boot/compressed/vmlinux.lds.in
+++ b/arch/arm/boot/compressed/vmlinux.lds.in
@@ -54,6 +54,7 @@ SECTIONS
.bss : { *(.bss) }
_end = .;
+ . = ALIGN(8); /* the stack must be 64-bit aligned */
.stack : { *(.stack) }
.stab 0 : { *(.stab) }
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-23 02:59:45 +0000