From 2577015dc5c48e7892dea8731a27530543606673 Mon Sep 17 00:00:00 2001 From: Simon Goldschmidt Date: Fri, 24 May 2019 22:07:04 +0200 Subject: [PATCH] spl: add overall SPL size check This adds a size check for SPL that can dynamically check generated SPL binaries (including devicetree) for a size limit that ensures this image plus global data, heap and stack fit in initial SRAM. Since some of these sizes are not available to make, a new host tool 'spl_size_limit' is added that dumps the resulting maximum size for an SPL binary to stdout. This tool is used in toplevel Makefile to implement the size check on SPL binaries. Signed-off-by: Simon Goldschmidt --- Kconfig | 8 -------- Makefile | 3 ++- common/spl/Kconfig | 36 ++++++++++++++++++++++++++++++++++++ tools/Makefile | 4 ++++ tools/spl_size_limit.c | 30 ++++++++++++++++++++++++++++++ 5 files changed, 72 insertions(+), 9 deletions(-) create mode 100644 tools/spl_size_limit.c diff --git a/Kconfig b/Kconfig index 709912e134..a02168690f 100644 --- a/Kconfig +++ b/Kconfig @@ -173,14 +173,6 @@ config TPL_SYS_MALLOC_F_LEN particular needs this to operate, so that it can allocate the initial serial device and any others that are needed. -config SPL_SIZE_LIMIT - int "Maximum size of SPL image" - depends on SPL - default 0 - help - Specifies the maximum length of the U-Boot SPL image. - If this value is zero, it is ignored. - menuconfig EXPERT bool "Configure standard U-Boot features (expert users)" default y diff --git a/Makefile b/Makefile index da8a38da63..8de3d4120a 100644 --- a/Makefile +++ b/Makefile @@ -797,7 +797,7 @@ BOARD_SIZE_CHECK = endif ifneq ($(CONFIG_SPL_SIZE_LIMIT),0) -SPL_SIZE_CHECK = @$(call size_check,$@,$(CONFIG_SPL_SIZE_LIMIT)) +SPL_SIZE_CHECK = @$(call size_check,$@,$$(tools/spl_size_limit)) else SPL_SIZE_CHECK = endif @@ -1782,6 +1782,7 @@ checkarmreloc: u-boot envtools: scripts_basic $(version_h) $(timestamp_h) $(Q)$(MAKE) $(build)=tools/env +tools-only: export TOOLS_ONLY=y tools-only: scripts_basic $(version_h) $(timestamp_h) $(Q)$(MAKE) $(build)=tools diff --git a/common/spl/Kconfig b/common/spl/Kconfig index c7cd34449a..6a98536f20 100644 --- a/common/spl/Kconfig +++ b/common/spl/Kconfig @@ -25,6 +25,42 @@ config SPL_FRAMEWORK supports MMC, NAND and YMODEM and other methods loading of U-Boot and the Linux Kernel. If unsure, say Y. +config SPL_SIZE_LIMIT + hex "Maximum size of SPL image" + depends on SPL + default 0 + help + Specifies the maximum length of the U-Boot SPL image. + If this value is zero, it is ignored. + +config SPL_SIZE_LIMIT_SUBTRACT_GD + bool "SPL image size check: provide space for global data" + depends on SPL_SIZE_LIMIT > 0 + help + If enabled, aligned size of global data is reserved in + SPL_SIZE_LIMIT check to ensure such an image does not overflow SRAM + if SPL_SIZE_LIMIT describes the size of SRAM available for SPL when + pre-reloc global data is put into this SRAM, too. + +config SPL_SIZE_LIMIT_SUBTRACT_MALLOC + bool "SPL image size check: provide space for malloc() pool before relocation" + depends on SPL_SIZE_LIMIT > 0 + help + If enabled, SPL_SYS_MALLOC_F_LEN is reserved in SPL_SIZE_LIMIT check + to ensure such an image does not overflow SRAM if SPL_SIZE_LIMIT + describes the size of SRAM available for SPL when pre-reloc malloc + pool is put into this SRAM, too. + +config SPL_SIZE_LIMIT_PROVIDE_STACK + hex "SPL image size check: provide stack space before relocation" + depends on SPL_SIZE_LIMIT > 0 + default 0 + help + If set, this size is reserved in SPL_SIZE_LIMIT check to ensure such + an image does not overflow SRAM if SPL_SIZE_LIMIT describes the size + of SRAM available for SPL when the stack required before reolcation + uses this SRAM, too. + config HANDOFF bool "Pass hand-off information from SPL to U-Boot proper" depends on BLOBLIST diff --git a/tools/Makefile b/tools/Makefile index e2f572cae1..33e90a8025 100644 --- a/tools/Makefile +++ b/tools/Makefile @@ -199,6 +199,10 @@ hostprogs-$(CONFIG_RISCV) += prelink-riscv hostprogs-y += fdtgrep fdtgrep-objs += $(LIBFDT_OBJS) fdtgrep.o +ifneq ($(TOOLS_ONLY),y) +hostprogs-y += spl_size_limit +endif + hostprogs-$(CONFIG_MIPS) += mips-relocs # We build some files with extra pedantic flags to try to minimize things diff --git a/tools/spl_size_limit.c b/tools/spl_size_limit.c new file mode 100644 index 0000000000..98ff491867 --- /dev/null +++ b/tools/spl_size_limit.c @@ -0,0 +1,30 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (c) 2019, Simon Goldschmidt + * + * This tool helps to return the size available for SPL image during build + */ + +#include +#include + +int main(int argc, char *argv[]) +{ + int spl_size_limit = 0; + +#ifdef CONFIG_SPL_SIZE_LIMIT + spl_size_limit = CONFIG_SPL_SIZE_LIMIT; +#ifdef CONFIG_SPL_SIZE_LIMIT_SUBTRACT_GD + spl_size_limit -= GENERATED_GBL_DATA_SIZE; +#endif +#ifdef CONFIG_SPL_SIZE_LIMIT_SUBTRACT_MALLOC + spl_size_limit -= CONFIG_SPL_SYS_MALLOC_F_LEN; +#endif +#ifdef CONFIG_SPL_SIZE_LIMIT_PROVIDE_STACK + spl_size_limit -= CONFIG_SPL_SIZE_LIMIT_PROVIDE_STACK; +#endif +#endif + + printf("%d", spl_size_limit); + return 0; +} -- 2.25.1