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Unverified Commit e1910c72 authored by Zong Li's avatar Zong Li Committed by Palmer Dabbelt
Browse files

RISC-V: Support CALL relocation type in kernel module 



Signed-off-by: default avatarZong Li <zong@andestech.com>
Signed-off-by: default avatarPalmer Dabbelt <palmer@sifive.com>
parent da975dd4

arch/riscv/kernel/module.c

+22 −0
Original line number Diff line number Diff line
@@ -141,6 +141,27 @@ static int apply_r_riscv_call_plt_rela(struct module *me, u32 *location, 
	return 0;

}



static int apply_r_riscv_call_rela(struct module *me, u32 *location,

				   Elf_Addr v)

{

	s64 offset = (void *)v - (void *)location;

	s32 fill_v = offset;

	u32 hi20, lo12;



	if (offset != fill_v) {

		pr_err(

		  "%s: target %016llx can not be addressed by the 32-bit offset from PC = %p\n",

		  me->name, v, location);

		return -EINVAL;

	}



	hi20 = (offset + 0x800) & 0xfffff000;

	lo12 = (offset - hi20) & 0xfff;

	*location = (*location & 0xfff) | hi20;

	*(location + 1) = (*(location + 1) & 0xfffff) | (lo12 << 20);

	return 0;

}



static int apply_r_riscv_relax_rela(struct module *me, u32 *location,

				    Elf_Addr v)

{
@@ -157,6 +178,7 @@ static int (*reloc_handlers_rela[]) (struct module *me, u32 *location, 
	[R_RISCV_PCREL_LO12_S]		= apply_r_riscv_pcrel_lo12_s_rela,

	[R_RISCV_GOT_HI20]		= apply_r_riscv_got_hi20_rela,

	[R_RISCV_CALL_PLT]		= apply_r_riscv_call_plt_rela,

	[R_RISCV_CALL]			= apply_r_riscv_call_rela,

	[R_RISCV_RELAX]			= apply_r_riscv_relax_rela,

};