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ARM: assembler: define a Kconfig symbol for group relocation support

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Nathan reports the group relocations go out of range in pathological
cases such as allyesconfig kernels, which have little chance of actually
booting but are still used in validation.

So add a Kconfig symbol for this feature, and make it depend on
!COMPILE_TEST.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Ard Biesheuvel 2022-01-24 19:16:58 +01:00
parent 8b806b82bc
commit d6905849f8
5 changed files with 28 additions and 12 deletions
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7
arch/arm/kernel/module.c
View file

@ -68,6 +68,7 @@ bool module_exit_section(const char *name)
strstarts(name, ".ARM.exidx.exit");
}
#ifdef CONFIG_ARM_HAS_GROUP_RELOCS
/*
* This implements the partitioning algorithm for group relocations as
* documented in the ARM AArch32 ELF psABI (IHI 0044).
@ -103,6 +104,7 @@ static u32 get_group_rem(u32 group, u32 *offset)
} while (group--);
return shift;
}
#endif
int
apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex,
@ -118,7 +120,9 @@ apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex,
unsigned long loc;
Elf32_Sym *sym;
const char *symname;
#ifdef CONFIG_ARM_HAS_GROUP_RELOCS
u32 shift, group = 1;
#endif
s32 offset;
u32 tmp;
#ifdef CONFIG_THUMB2_KERNEL
@ -249,6 +253,7 @@ apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex,
*(u32 *)loc = __opcode_to_mem_arm(tmp);
break;
#ifdef CONFIG_ARM_HAS_GROUP_RELOCS
case R_ARM_ALU_PC_G0_NC:
group = 0;
fallthrough;
@ -296,7 +301,7 @@ apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex,
}
*(u32 *)loc = __opcode_to_mem_arm((tmp & ~0xfff) | offset);
break;
#endif
#ifdef CONFIG_THUMB2_KERNEL
case R_ARM_THM_CALL:
case R_ARM_THM_JUMP24: