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| author | Zong Li <zong@andestech.com> | 2018-03-15 16:50:45 +0800 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@sifive.com> | 2018-04-02 20:00:55 -0700 |
| commit | e7456e696bff09ef2345081bf21e5ce741e2a3ce (patch) | |
| tree | 285807b8f8365de134680aefd95b890089e01bdd /arch | |
| parent | e1910c72bdc405b5028510ccc3ed42f0ed25cc6c (diff) | |
| download | linux-e7456e696bff09ef2345081bf21e5ce741e2a3ce.tar.gz | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/riscv/kernel/module.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/arch/riscv/kernel/module.c b/arch/riscv/kernel/module.c index 3f2730840c25..f1bd6b1a4520 100644 --- a/arch/riscv/kernel/module.c +++ b/arch/riscv/kernel/module.c @@ -92,6 +92,45 @@ static int apply_r_riscv_pcrel_lo12_s_rela(struct module *me, u32 *location, 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, 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_LO12_I] = apply_r_riscv_pcrel_lo12_i_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_CALL_PLT] = apply_r_riscv_call_plt_rela, [R_RISCV_CALL] = apply_r_riscv_call_rela, |