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support bare metal toolchains #344

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support bare metal toolchains #344

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cd571e9
firmware: discard dynsym section
yogo1212 Jan 25, 2024
708aa0b
check for --exclude-libs
yogo1212 Jan 25, 2024
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5 changes: 5 additions & 0 deletions Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -167,6 +167,9 @@ endif
# Check whether the linker supports creating PIEs
OPENSBI_LD_PIE := $(shell $(CC) $(CLANG_TARGET) $(RELAX_FLAG) $(USE_LD_FLAG) -fPIE -nostdlib -Wl,-pie -x c /dev/null -o /dev/null >/dev/null 2>&1 && echo y || echo n)

# Check whether the linker supports --exclude-libs
OPENSBI_LD_EXCLUDE_LIBS := $(shell $(CC) $(CLANG_TARGET) $(RELAX_FLAG) $(USE_LD_FLAG) "-Wl,--exclude-libs,ALL" -x c /dev/null -o /dev/null >/dev/null 2>&1 && echo y || echo n)

# Check whether the compiler supports -m(no-)save-restore
CC_SUPPORT_SAVE_RESTORE := $(shell $(CC) $(CLANG_TARGET) $(RELAX_FLAG) -nostdlib -mno-save-restore -x c /dev/null -o /dev/null 2>&1 | grep -e "-save-restore" >/dev/null && echo n || echo y)

Expand Down Expand Up @@ -375,7 +378,9 @@ ASFLAGS += $(firmware-asflags-y)
ARFLAGS = rcs

ELFFLAGS += $(USE_LD_FLAG)
ifeq ($(OPENSBI_LD_EXCLUDE_LIBS),y)
ELFFLAGS += -Wl,--exclude-libs,ALL
endif
ELFFLAGS += -Wl,--build-id=none
ELFFLAGS += $(platform-ldflags-y)
ELFFLAGS += $(firmware-ldflags-y)
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6 changes: 5 additions & 1 deletion firmware/fw_base.ldS
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Original file line number Diff line number Diff line change
Expand Up @@ -50,12 +50,16 @@

/* End of the read-only data sections */

/DISCARD/ : {
*(.dynsym)
}

/*
* PMP regions must be to be power-of-2. RX/RW will have separate
* regions, so ensure that the split is power-of-2.
*/
. = ALIGN(1 << LOG2CEIL((SIZEOF(.rodata) + SIZEOF(.text)
+ SIZEOF(.dynsym) + SIZEOF(.rela.dyn))));
+ SIZEOF(.rela.dyn))));

PROVIDE(_fw_rw_start = .);

Expand Down