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RISC-V: Support HI20/LO12_I/LO12_S relocation type in kernel module 

HI20 and LO12_I/LO12_S relocate the absolute address, the range of
offset must in 32-bit.

Signed-off-by: Zong Li <zong@andestech.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
This commit is contained in:
Zong Li 2018-03-15 16:50:45 +08:00 committed by Palmer Dabbelt
parent e1910c72bd
commit e7456e696b
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1 changed files with 42 additions and 0 deletions
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42
arch/riscv/kernel/module.c
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@ -92,6 +92,45 @@ static int apply_r_riscv_pcrel_lo12_s_rela(struct module *me, u32 *location,
return 0; return 0;
} }
static int apply_r_riscv_hi20_rela(struct module *me, u32 *location,
Elf_Addr v)
{
s32 hi20;
if (IS_ENABLED(CMODEL_MEDLOW)) {
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 = ((s32)v + 0x800) & 0xfffff000;
*location = (*location & 0xfff) | hi20;
return 0;
}
static int apply_r_riscv_lo12_i_rela(struct module *me, u32 *location,
Elf_Addr v)
{
/* Skip medlow checking because of filtering by HI20 already */
s32 hi20 = ((s32)v + 0x800) & 0xfffff000;
s32 lo12 = ((s32)v - hi20);
*location = (*location & 0xfffff) | ((lo12 & 0xfff) << 20);
return 0;
}
static int apply_r_riscv_lo12_s_rela(struct module *me, u32 *location,
Elf_Addr v)
{
/* Skip medlow checking because of filtering by HI20 already */
s32 hi20 = ((s32)v + 0x800) & 0xfffff000;
s32 lo12 = ((s32)v - hi20);
u32 imm11_5 = (lo12 & 0xfe0) << (31 - 11);
u32 imm4_0 = (lo12 & 0x1f) << (11 - 4);
*location = (*location & 0x1fff07f) | imm11_5 | imm4_0;
return 0;
}
static int apply_r_riscv_got_hi20_rela(struct module *me, u32 *location, static int apply_r_riscv_got_hi20_rela(struct module *me, u32 *location,
Elf_Addr v) Elf_Addr v)
{ {
@ -176,6 +215,9 @@ static int (*reloc_handlers_rela[]) (struct module *me, u32 *location,
[R_RISCV_PCREL_HI20] = apply_r_riscv_pcrel_hi20_rela, [R_RISCV_PCREL_HI20] = apply_r_riscv_pcrel_hi20_rela,
[R_RISCV_PCREL_LO12_I] = apply_r_riscv_pcrel_lo12_i_rela, [R_RISCV_PCREL_LO12_I] = apply_r_riscv_pcrel_lo12_i_rela,
[R_RISCV_PCREL_LO12_S] = apply_r_riscv_pcrel_lo12_s_rela, [R_RISCV_PCREL_LO12_S] = apply_r_riscv_pcrel_lo12_s_rela,
[R_RISCV_HI20] = apply_r_riscv_hi20_rela,
[R_RISCV_LO12_I] = apply_r_riscv_lo12_i_rela,
[R_RISCV_LO12_S] = apply_r_riscv_lo12_s_rela,
[R_RISCV_GOT_HI20] = apply_r_riscv_got_hi20_rela, [R_RISCV_GOT_HI20] = apply_r_riscv_got_hi20_rela,
[R_RISCV_CALL_PLT] = apply_r_riscv_call_plt_rela, [R_RISCV_CALL_PLT] = apply_r_riscv_call_plt_rela,
[R_RISCV_CALL] = apply_r_riscv_call_rela, [R_RISCV_CALL] = apply_r_riscv_call_rela,