Merge patch series "Various toolchain compatibility fixes/improvements"

Sam Edwards <cfsworks@gmail.com> says:

This is v2 of my "misc. fixes" series, sent to prepare the codebase for more
direct LLVM support in the near future. This series contains several fixes that
I found in the process of preparing that support and which address issues
independent of any future feature or enhancement. I am sending these now, both
so that their inclusion is not delayed by discussion on my upcoming series and
to make the latter more manageable.

Link: https://lore.kernel.org/r/20250315221813.1265193-1-CFSworks@gmail.com

Makefile

@@ -406,6 +406,7 @@ LDR		= $(CROSS_COMPILE)ldr
 STRIP		= $(CROSS_COMPILE)strip
 OBJCOPY		= $(CROSS_COMPILE)objcopy
 OBJDUMP		= $(CROSS_COMPILE)objdump
+READELF		= $(CROSS_COMPILE)readelf
 LEX		= flex
 YACC		= bison
 AWK		= awk
@@ -820,6 +821,7 @@ KBUILD_AFLAGS += $(KAFLAGS)
 KBUILD_CFLAGS += $(KCFLAGS)
 
 KBUILD_LDFLAGS  += -z noexecstack
+KBUILD_LDFLAGS  += -z norelro
 KBUILD_LDFLAGS  += $(call ld-option,--no-warn-rwx-segments)
 
 KBUILD_HOSTCFLAGS += $(if $(CONFIG_TOOLS_DEBUG),-g)
@@ -1065,7 +1067,7 @@ quiet_cmd_objcopy = OBJCOPY $@
 cmd_objcopy = $(OBJCOPY) --gap-fill=0xff $(OBJCOPYFLAGS) \
 	$(OBJCOPYFLAGS_$(@F)) $< $@
 
-# Provide a version which does not do this, for use by EFI
+# Provide a version which does not do this, for use by EFI and hex/srec
 quiet_cmd_zobjcopy = OBJCOPY $@
 cmd_zobjcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
 
@@ -1280,7 +1282,7 @@ OBJCOPYFLAGS_u-boot.hex := -O ihex
 OBJCOPYFLAGS_u-boot.srec := -O srec
 
 u-boot.hex u-boot.srec: u-boot FORCE
-	$(call if_changed,objcopy)
+	$(call if_changed,zobjcopy)
 
 OBJCOPYFLAGS_u-boot-elf.srec := $(OBJCOPYFLAGS_u-boot.srec)
 
@@ -1294,12 +1296,12 @@ OBJCOPYFLAGS_u-boot-elf.srec += --change-addresses=0x50000000
 endif
 
 u-boot-elf.srec: u-boot.elf FORCE
-	$(call if_changed,objcopy)
+	$(call if_changed,zobjcopy)
 
 OBJCOPYFLAGS_u-boot-spl.srec = $(OBJCOPYFLAGS_u-boot.srec)
 
 spl/u-boot-spl.srec: spl/u-boot-spl FORCE
-	$(call if_changed,objcopy)
+	$(call if_changed,zobjcopy)
 
 %.scif: %.srec
 	$(Q)$(MAKE) $(build)=arch/arm/mach-renesas $@
@@ -1434,7 +1436,7 @@ OBJCOPYFLAGS_u-boot.ldr.hex := -I binary -O ihex
 OBJCOPYFLAGS_u-boot.ldr.srec := -I binary -O srec
 
 u-boot.ldr.hex u-boot.ldr.srec: u-boot.ldr FORCE
-	$(call if_changed,objcopy)
+	$(call if_changed,zobjcopy)
 
 ifdef CONFIG_SPL_LOAD_FIT
 MKIMAGEFLAGS_u-boot.img = -f auto -A $(ARCH) -T firmware -C none -O u-boot \
@@ -2175,7 +2177,7 @@ System.map:	u-boot
 # ARM relocations should all be R_ARM_RELATIVE (32-bit) or
 # R_AARCH64_RELATIVE (64-bit).
 checkarmreloc: u-boot
-	@RELOC="`$(CROSS_COMPILE)readelf -r -W $< | cut -d ' ' -f 4 | \
+	@RELOC="`$(READELF) -r -W $< | cut -d ' ' -f 4 | \
 		grep R_A | sort -u`"; \
 	if test "$$RELOC" != "R_ARM_RELATIVE" -a \
 		 "$$RELOC" != "R_AARCH64_RELATIVE"; then \

arch/arm/cpu/u-boot.lds

@@ -169,15 +169,6 @@ SECTIONS
 	_end = .;
 	_image_binary_end = .;
 
-	/*
-	 * Deprecated: this MMU section is used by pxa at present but
-	 * should not be used by new boards/CPUs.
-	 */
-	. = ALIGN(4096);
-	.mmutable : {
-		*(.mmutable)
-	}
-
 /*
  * These sections occupy the same memory, but their lifetimes do
  * not overlap: U-Boot initializes .bss only after applying dynamic
@@ -190,14 +181,14 @@ SECTIONS
 		__bss_end = .;
 	}
 
-	.dynsym _image_binary_end : { *(.dynsym) }
+	/DISCARD/ : { *(.dynsym) }
-	.dynbss : { *(.dynbss) }
+	/DISCARD/ : { *(.dynbss) }
-	.dynstr : { *(.dynstr*) }
+	/DISCARD/ : { *(.dynstr*) }
-	.dynamic : { *(.dynamic*) }
+	/DISCARD/ : { *(.dynamic*) }
-	.plt : { *(.plt*) }
+	/DISCARD/ : { *(.plt*) }
-	.interp : { *(.interp*) }
+	/DISCARD/ : { *(.interp*) }
-	.gnu.hash : { *(.gnu.hash) }
+	/DISCARD/ : { *(.gnu.hash) }
-	.gnu : { *(.gnu*) }
+	/DISCARD/ : { *(.gnu*) }
-	.ARM.exidx : { *(.ARM.exidx*) }
+	/DISCARD/ : { *(.ARM.exidx*) }
-	.gnu.linkonce.armexidx : { *(.gnu.linkonce.armexidx.*) }
+	/DISCARD/ : { *(.gnu.linkonce.armexidx.*) }
 }

arch/arm/lib/Makefile

@@ -92,6 +92,7 @@ obj-$(CONFIG_GENERATE_ACPI_TABLE) += acpi_table.o
 # For EABI conformant tool chains, provide eabi_compat()
 ifneq (,$(findstring -mabi=aapcs-linux,$(PLATFORM_CPPFLAGS)))
 extra-y	+= eabi_compat.o
+CFLAGS_REMOVE_eabi_compat.o := $(LTO_CFLAGS)
 endif
 
 # some files can only build in ARM or THUMB2, not THUMB1

arch/arm/lib/crt0_arm_efi.S

@@ -150,7 +150,8 @@ _start:
 	adr		r1, .L_DYNAMIC
 	ldr		r0, [r1]
 	add		r1, r0, r1
-	adrl		r0, image_base
+	sub		r0, pc, #((.+8-image_base) & 0xff)
+	sub		r0, r0, #((.+4-image_base) & 0xff00)
 	bl		_relocate
 	teq		r0, #0
 	bne		0f

arch/arm/lib/eabi_compat.c

@@ -33,7 +33,24 @@ void __aeabi_memcpy(void *dest, const void *src, size_t n)
 	(void) memcpy(dest, src, n);
 }
 
+void __aeabi_memcpy4(void *dest, const void *src, size_t n) __alias(__aeabi_memcpy);
+
+void __aeabi_memcpy8(void *dest, const void *src, size_t n) __alias(__aeabi_memcpy);
+
 void __aeabi_memset(void *dest, size_t n, int c)
 {
 	(void) memset(dest, c, n);
 }
+
+void __aeabi_memset4(void *dest, size_t n, int c) __alias(__aeabi_memset);
+
+void __aeabi_memset8(void *dest, size_t n, int c) __alias(__aeabi_memset);
+
+void __aeabi_memclr(void *dest, size_t n)
+{
+	(void) memset(dest, 0, n);
+}
+
+void __aeabi_memclr4(void *dest, size_t n) __alias(__aeabi_memclr);
+
+void __aeabi_memclr8(void *dest, size_t n) __alias(__aeabi_memclr);

arch/x86/cpu/i386/call64.S

@@ -10,7 +10,7 @@
 #include <asm/processor-flags.h>
 
 .code32
-.section .text_call64
+.section .text_call64, "ax"
 .globl cpu_call64
 cpu_call64:
 	/*

common/spl/spl_fit.c

@@ -397,7 +397,7 @@ static int spl_fit_append_fdt(struct spl_image_info *spl_image,
 	 * Use the address following the image as target address for the
 	 * device tree.
 	 */
-	image_info.load_addr = spl_image->load_addr + spl_image->size;
+	image_info.load_addr = ALIGN(spl_image->load_addr + spl_image->size, 8);
 
 	/* Figure out which device tree the board wants to use */
 	node = spl_fit_get_image_node(ctx, FIT_FDT_PROP, index++);

common/spl/spl_opensbi.c

@@ -57,6 +57,11 @@ void __noreturn spl_invoke_opensbi(struct spl_image_info *spl_image)
 		hang();
 	}
 
+	if (!IS_ALIGNED((uintptr_t)spl_image->fdt_addr, 8)) {
+		pr_err("SPL image loaded an improperly-aligned device tree\n");
+		hang();
+	}
+
 	/*
 	 * Originally, u-boot-spl will place DTB directly after the kernel,
 	 * but the size of the kernel did not include the BSS section, which