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brcm47xx: relocate the stack in loader

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By default we are reusing the stack provided by CFE, like it is intended
by CFE. On my WRT54GS it is located at 0x8043BF30, so a big kernel image
could overwrite it. Relocate it to a different memory region which is
still under the 8MB RAM, but in the higher area. We only need this
memory region for the stack of the loader, Linux will set up this
for its own.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
This commit is contained in:
Hauke Mehrtens 2017-10-08 18:31:03 +02:00
parent d5cf4a5aa4
commit 2909a4b78e
2 changed files with 4 additions and 2 deletions
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5
target/linux/brcm47xx/image/lzma-loader/src/Makefile
View File

@ -19,6 +19,7 @@
TEXT_START := 0x80001000
BZ_TEXT_START := 0x80600000
BZ_STACK_START := 0x80700000
OBJCOPY := $(CROSS_COMPILE)objcopy -O binary -R .reginfo -R .note -R .comment -R .mdebug -S
@ -28,9 +29,9 @@ CFLAGS = -D__KERNEL__ -Wall -Wstrict-prototypes -Wno-trigraphs -Os \
-mabi=32 -march=mips32 -Wa,-32 -Wa,-march=mips32 -Wa,-mips32 -Wa,--trap
CFLAGS += -DLOADADDR=$(TEXT_START) -D_LZMA_IN_CB
ASFLAGS = $(CFLAGS) -D__ASSEMBLY__ -DBZ_TEXT_START=$(BZ_TEXT_START)
ASFLAGS = $(CFLAGS) -D__ASSEMBLY__ -DBZ_TEXT_START=$(BZ_TEXT_START) -DBZ_STACK_START=$(BZ_STACK_START)
SEDFLAGS := s/BZ_TEXT_START/$(BZ_TEXT_START)/;s/TEXT_START/$(TEXT_START)/
SEDFLAGS := s/BZ_TEXT_START/$(BZ_TEXT_START)/;s/BZ_STACK_START/$(BZ_STACK_START)/;s/TEXT_START/$(TEXT_START)/
OBJECTS := head.o data.o

1
target/linux/brcm47xx/image/lzma-loader/src/head.S
View File

@ -38,6 +38,7 @@
.text
LEAF(startup)
.set noreorder
li sp, BZ_STACK_START
addi sp, -48
sw a0, 16(sp)
sw a1, 20(sp)