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riscv: Add remaining module relocations
Add all final module relocations and add error logs explaining the ones that are not supported. Implement overflow checks for ADD/SUB/SET/ULEB128 relocations. Signed-off-by: Charlie Jenkins <charlie@rivosinc.com> Link: https://lore.kernel.org/r/20231101-module_relocations-v9-2-8dfa3483c400@rivosinc.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Charlie Jenkins
Palmer Dabbelt
parent
8cbe0accc4
commit
8fd6c51423
@ -49,6 +49,7 @@ typedef union __riscv_fp_state elf_fpregset_t;
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#define R_RISCV_TLS_DTPREL64 9
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#define R_RISCV_TLS_TPREL32 10
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#define R_RISCV_TLS_TPREL64 11
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#define R_RISCV_IRELATIVE 58
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/* Relocation types not used by the dynamic linker */
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#define R_RISCV_BRANCH 16
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@ -81,7 +82,6 @@ typedef union __riscv_fp_state elf_fpregset_t;
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#define R_RISCV_ALIGN 43
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#define R_RISCV_RVC_BRANCH 44
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#define R_RISCV_RVC_JUMP 45
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#define R_RISCV_LUI 46
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#define R_RISCV_GPREL_I 47
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#define R_RISCV_GPREL_S 48
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#define R_RISCV_TPREL_I 49
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@ -93,6 +93,9 @@ typedef union __riscv_fp_state elf_fpregset_t;
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#define R_RISCV_SET16 55
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#define R_RISCV_SET32 56
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#define R_RISCV_32_PCREL 57
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#define R_RISCV_PLT32 59
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#define R_RISCV_SET_ULEB128 60
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#define R_RISCV_SUB_ULEB128 61
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#endif /* _UAPI_ASM_RISCV_ELF_H */
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@ -7,6 +7,9 @@
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#include <linux/elf.h>
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#include <linux/err.h>
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#include <linux/errno.h>
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#include <linux/hashtable.h>
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#include <linux/kernel.h>
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#include <linux/log2.h>
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#include <linux/moduleloader.h>
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#include <linux/vmalloc.h>
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#include <linux/sizes.h>
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@ -14,6 +17,38 @@
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#include <asm/alternative.h>
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#include <asm/sections.h>
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struct used_bucket {
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struct list_head head;
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struct hlist_head *bucket;
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};
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struct relocation_head {
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struct hlist_node node;
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struct list_head *rel_entry;
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void *location;
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};
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struct relocation_entry {
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struct list_head head;
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Elf_Addr value;
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unsigned int type;
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};
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struct relocation_handlers {
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int (*reloc_handler)(struct module *me, void *location, Elf_Addr v);
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int (*accumulate_handler)(struct module *me, void *location,
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long buffer);
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};
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unsigned int initialize_relocation_hashtable(unsigned int num_relocations);
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void process_accumulated_relocations(struct module *me);
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int add_relocation_to_accumulate(struct module *me, int type, void *location,
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unsigned int hashtable_bits, Elf_Addr v);
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struct hlist_head *relocation_hashtable;
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struct list_head used_buckets_list;
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/*
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* The auipc+jalr instruction pair can reach any PC-relative offset
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* in the range [-2^31 - 2^11, 2^31 - 2^11)
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@ -273,6 +308,12 @@ static int apply_r_riscv_align_rela(struct module *me, void *location,
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return -EINVAL;
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}
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static int apply_r_riscv_add8_rela(struct module *me, void *location, Elf_Addr v)
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{
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*(u8 *)location += (u8)v;
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return 0;
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}
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static int apply_r_riscv_add16_rela(struct module *me, void *location,
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Elf_Addr v)
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{
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@ -294,6 +335,12 @@ static int apply_r_riscv_add64_rela(struct module *me, void *location,
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return 0;
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}
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static int apply_r_riscv_sub8_rela(struct module *me, void *location, Elf_Addr v)
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{
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*(u8 *)location -= (u8)v;
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return 0;
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}
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static int apply_r_riscv_sub16_rela(struct module *me, void *location,
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Elf_Addr v)
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{
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@ -315,33 +362,369 @@ static int apply_r_riscv_sub64_rela(struct module *me, void *location,
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return 0;
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}
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static int (*reloc_handlers_rela[]) (struct module *me, void *location,
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Elf_Addr v) = {
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[R_RISCV_32] = apply_r_riscv_32_rela,
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[R_RISCV_64] = apply_r_riscv_64_rela,
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[R_RISCV_BRANCH] = apply_r_riscv_branch_rela,
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[R_RISCV_JAL] = apply_r_riscv_jal_rela,
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[R_RISCV_RVC_BRANCH] = apply_r_riscv_rvc_branch_rela,
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[R_RISCV_RVC_JUMP] = apply_r_riscv_rvc_jump_rela,
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[R_RISCV_PCREL_HI20] = apply_r_riscv_pcrel_hi20_rela,
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[R_RISCV_PCREL_LO12_I] = apply_r_riscv_pcrel_lo12_i_rela,
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[R_RISCV_PCREL_LO12_S] = apply_r_riscv_pcrel_lo12_s_rela,
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[R_RISCV_HI20] = apply_r_riscv_hi20_rela,
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[R_RISCV_LO12_I] = apply_r_riscv_lo12_i_rela,
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[R_RISCV_LO12_S] = apply_r_riscv_lo12_s_rela,
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[R_RISCV_GOT_HI20] = apply_r_riscv_got_hi20_rela,
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[R_RISCV_CALL_PLT] = apply_r_riscv_call_plt_rela,
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[R_RISCV_CALL] = apply_r_riscv_call_rela,
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[R_RISCV_RELAX] = apply_r_riscv_relax_rela,
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[R_RISCV_ALIGN] = apply_r_riscv_align_rela,
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[R_RISCV_ADD16] = apply_r_riscv_add16_rela,
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[R_RISCV_ADD32] = apply_r_riscv_add32_rela,
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[R_RISCV_ADD64] = apply_r_riscv_add64_rela,
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[R_RISCV_SUB16] = apply_r_riscv_sub16_rela,
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[R_RISCV_SUB32] = apply_r_riscv_sub32_rela,
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[R_RISCV_SUB64] = apply_r_riscv_sub64_rela,
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static int dynamic_linking_not_supported(struct module *me, void *location,
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Elf_Addr v)
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{
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pr_err("%s: Dynamic linking not supported in kernel modules PC = %p\n",
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me->name, location);
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return -EINVAL;
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}
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static int tls_not_supported(struct module *me, void *location, Elf_Addr v)
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{
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pr_err("%s: Thread local storage not supported in kernel modules PC = %p\n",
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me->name, location);
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return -EINVAL;
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}
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static int apply_r_riscv_sub6_rela(struct module *me, void *location, Elf_Addr v)
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{
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u8 *byte = location;
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u8 value = v;
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*byte = (*byte - (value & 0x3f)) & 0x3f;
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return 0;
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}
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static int apply_r_riscv_set6_rela(struct module *me, void *location, Elf_Addr v)
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{
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u8 *byte = location;
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u8 value = v;
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*byte = (*byte & 0xc0) | (value & 0x3f);
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return 0;
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}
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static int apply_r_riscv_set8_rela(struct module *me, void *location, Elf_Addr v)
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{
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*(u8 *)location = (u8)v;
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return 0;
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}
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static int apply_r_riscv_set16_rela(struct module *me, void *location,
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Elf_Addr v)
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{
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*(u16 *)location = (u16)v;
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return 0;
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}
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static int apply_r_riscv_set32_rela(struct module *me, void *location,
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Elf_Addr v)
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{
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*(u32 *)location = (u32)v;
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return 0;
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}
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static int apply_r_riscv_32_pcrel_rela(struct module *me, void *location,
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Elf_Addr v)
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{
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*(u32 *)location = v - (uintptr_t)location;
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return 0;
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}
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static int apply_r_riscv_plt32_rela(struct module *me, void *location,
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Elf_Addr v)
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{
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ptrdiff_t offset = (void *)v - location;
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if (!riscv_insn_valid_32bit_offset(offset)) {
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/* Only emit the plt entry if offset over 32-bit range */
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if (IS_ENABLED(CONFIG_MODULE_SECTIONS)) {
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offset = (void *)module_emit_plt_entry(me, v) - location;
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} else {
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pr_err("%s: target %016llx can not be addressed by the 32-bit offset from PC = %p\n",
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me->name, (long long)v, location);
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return -EINVAL;
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}
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}
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*(u32 *)location = (u32)offset;
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return 0;
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}
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static int apply_r_riscv_set_uleb128(struct module *me, void *location, Elf_Addr v)
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{
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*(long *)location = v;
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return 0;
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}
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static int apply_r_riscv_sub_uleb128(struct module *me, void *location, Elf_Addr v)
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{
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*(long *)location -= v;
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return 0;
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}
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static int apply_6_bit_accumulation(struct module *me, void *location, long buffer)
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{
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u8 *byte = location;
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u8 value = buffer;
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if (buffer > 0x3f) {
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pr_err("%s: value %ld out of range for 6-bit relocation.\n",
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me->name, buffer);
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return -EINVAL;
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}
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*byte = (*byte & 0xc0) | (value & 0x3f);
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return 0;
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}
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static int apply_8_bit_accumulation(struct module *me, void *location, long buffer)
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{
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if (buffer > U8_MAX) {
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pr_err("%s: value %ld out of range for 8-bit relocation.\n",
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me->name, buffer);
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return -EINVAL;
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}
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*(u8 *)location = (u8)buffer;
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return 0;
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}
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static int apply_16_bit_accumulation(struct module *me, void *location, long buffer)
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{
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if (buffer > U16_MAX) {
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pr_err("%s: value %ld out of range for 16-bit relocation.\n",
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me->name, buffer);
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return -EINVAL;
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}
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*(u16 *)location = (u16)buffer;
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return 0;
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}
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static int apply_32_bit_accumulation(struct module *me, void *location, long buffer)
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{
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if (buffer > U32_MAX) {
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pr_err("%s: value %ld out of range for 32-bit relocation.\n",
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me->name, buffer);
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return -EINVAL;
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}
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*(u32 *)location = (u32)buffer;
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return 0;
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}
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static int apply_64_bit_accumulation(struct module *me, void *location, long buffer)
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{
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*(u64 *)location = (u64)buffer;
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return 0;
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}
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static int apply_uleb128_accumulation(struct module *me, void *location, long buffer)
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{
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/*
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* ULEB128 is a variable length encoding. Encode the buffer into
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* the ULEB128 data format.
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*/
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u8 *p = location;
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while (buffer != 0) {
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u8 value = buffer & 0x7f;
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buffer >>= 7;
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value |= (!!buffer) << 7;
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*p++ = value;
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}
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return 0;
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}
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/*
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* Relocations defined in the riscv-elf-psabi-doc.
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* This handles static linking only.
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*/
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static const struct relocation_handlers reloc_handlers[] = {
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[R_RISCV_32] = { apply_r_riscv_32_rela },
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[R_RISCV_64] = { apply_r_riscv_64_rela },
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[R_RISCV_RELATIVE] = { dynamic_linking_not_supported },
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[R_RISCV_COPY] = { dynamic_linking_not_supported },
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[R_RISCV_JUMP_SLOT] = { dynamic_linking_not_supported },
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[R_RISCV_TLS_DTPMOD32] = { dynamic_linking_not_supported },
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[R_RISCV_TLS_DTPMOD64] = { dynamic_linking_not_supported },
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[R_RISCV_TLS_DTPREL32] = { dynamic_linking_not_supported },
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[R_RISCV_TLS_DTPREL64] = { dynamic_linking_not_supported },
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[R_RISCV_TLS_TPREL32] = { dynamic_linking_not_supported },
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[R_RISCV_TLS_TPREL64] = { dynamic_linking_not_supported },
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/* 12-15 undefined */
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[R_RISCV_BRANCH] = { apply_r_riscv_branch_rela },
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[R_RISCV_JAL] = { apply_r_riscv_jal_rela },
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[R_RISCV_CALL] = { apply_r_riscv_call_rela },
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[R_RISCV_CALL_PLT] = { apply_r_riscv_call_plt_rela },
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[R_RISCV_GOT_HI20] = { apply_r_riscv_got_hi20_rela },
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[R_RISCV_TLS_GOT_HI20] = { tls_not_supported },
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[R_RISCV_TLS_GD_HI20] = { tls_not_supported },
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[R_RISCV_PCREL_HI20] = { apply_r_riscv_pcrel_hi20_rela },
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[R_RISCV_PCREL_LO12_I] = { apply_r_riscv_pcrel_lo12_i_rela },
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[R_RISCV_PCREL_LO12_S] = { apply_r_riscv_pcrel_lo12_s_rela },
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[R_RISCV_HI20] = { apply_r_riscv_hi20_rela },
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[R_RISCV_LO12_I] = { apply_r_riscv_lo12_i_rela },
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[R_RISCV_LO12_S] = { apply_r_riscv_lo12_s_rela },
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[R_RISCV_TPREL_HI20] = { tls_not_supported },
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[R_RISCV_TPREL_LO12_I] = { tls_not_supported },
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[R_RISCV_TPREL_LO12_S] = { tls_not_supported },
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[R_RISCV_TPREL_ADD] = { tls_not_supported },
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[R_RISCV_ADD8] = { apply_r_riscv_add8_rela, apply_8_bit_accumulation },
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[R_RISCV_ADD16] = { apply_r_riscv_add16_rela,
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apply_16_bit_accumulation },
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[R_RISCV_ADD32] = { apply_r_riscv_add32_rela,
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apply_32_bit_accumulation },
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[R_RISCV_ADD64] = { apply_r_riscv_add64_rela,
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apply_64_bit_accumulation },
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[R_RISCV_SUB8] = { apply_r_riscv_sub8_rela, apply_8_bit_accumulation },
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[R_RISCV_SUB16] = { apply_r_riscv_sub16_rela,
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apply_16_bit_accumulation },
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[R_RISCV_SUB32] = { apply_r_riscv_sub32_rela,
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apply_32_bit_accumulation },
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[R_RISCV_SUB64] = { apply_r_riscv_sub64_rela,
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apply_64_bit_accumulation },
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/* 41-42 reserved for future standard use */
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[R_RISCV_ALIGN] = { apply_r_riscv_align_rela },
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[R_RISCV_RVC_BRANCH] = { apply_r_riscv_rvc_branch_rela },
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[R_RISCV_RVC_JUMP] = { apply_r_riscv_rvc_jump_rela },
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/* 46-50 reserved for future standard use */
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[R_RISCV_RELAX] = { apply_r_riscv_relax_rela },
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[R_RISCV_SUB6] = { apply_r_riscv_sub6_rela, apply_6_bit_accumulation },
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[R_RISCV_SET6] = { apply_r_riscv_set6_rela, apply_6_bit_accumulation },
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[R_RISCV_SET8] = { apply_r_riscv_set8_rela, apply_8_bit_accumulation },
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[R_RISCV_SET16] = { apply_r_riscv_set16_rela,
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apply_16_bit_accumulation },
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[R_RISCV_SET32] = { apply_r_riscv_set32_rela,
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apply_32_bit_accumulation },
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[R_RISCV_32_PCREL] = { apply_r_riscv_32_pcrel_rela },
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[R_RISCV_IRELATIVE] = { dynamic_linking_not_supported },
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[R_RISCV_PLT32] = { apply_r_riscv_plt32_rela },
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[R_RISCV_SET_ULEB128] = { apply_r_riscv_set_uleb128,
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apply_uleb128_accumulation },
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[R_RISCV_SUB_ULEB128] = { apply_r_riscv_sub_uleb128,
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apply_uleb128_accumulation },
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/* 62-191 reserved for future standard use */
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/* 192-255 nonstandard ABI extensions */
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};
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void process_accumulated_relocations(struct module *me)
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{
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/*
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* Only ADD/SUB/SET/ULEB128 should end up here.
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*
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* Each bucket may have more than one relocation location. All
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* relocations for a location are stored in a list in a bucket.
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*
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* Relocations are applied to a temp variable before being stored to the
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* provided location to check for overflow. This also allows ULEB128 to
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* properly decide how many entries are needed before storing to
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* location. The final value is stored into location using the handler
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* for the last relocation to an address.
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*
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* Three layers of indexing:
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* - Each of the buckets in use
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* - Groups of relocations in each bucket by location address
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* - Each relocation entry for a location address
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*/
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struct used_bucket *bucket_iter;
|
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struct relocation_head *rel_head_iter;
|
||||
struct relocation_entry *rel_entry_iter;
|
||||
int curr_type;
|
||||
void *location;
|
||||
long buffer;
|
||||
|
||||
list_for_each_entry(bucket_iter, &used_buckets_list, head) {
|
||||
hlist_for_each_entry(rel_head_iter, bucket_iter->bucket, node) {
|
||||
buffer = 0;
|
||||
location = rel_head_iter->location;
|
||||
list_for_each_entry(rel_entry_iter,
|
||||
rel_head_iter->rel_entry, head) {
|
||||
curr_type = rel_entry_iter->type;
|
||||
reloc_handlers[curr_type].reloc_handler(
|
||||
me, &buffer, rel_entry_iter->value);
|
||||
kfree(rel_entry_iter);
|
||||
}
|
||||
reloc_handlers[curr_type].accumulate_handler(
|
||||
me, location, buffer);
|
||||
kfree(rel_head_iter);
|
||||
}
|
||||
kfree(bucket_iter);
|
||||
}
|
||||
|
||||
kfree(relocation_hashtable);
|
||||
}
|
||||
|
||||
int add_relocation_to_accumulate(struct module *me, int type, void *location,
|
||||
unsigned int hashtable_bits, Elf_Addr v)
|
||||
{
|
||||
struct relocation_entry *entry;
|
||||
struct relocation_head *rel_head;
|
||||
struct hlist_head *current_head;
|
||||
struct used_bucket *bucket;
|
||||
unsigned long hash;
|
||||
|
||||
entry = kmalloc(sizeof(*entry), GFP_KERNEL);
|
||||
INIT_LIST_HEAD(&entry->head);
|
||||
entry->type = type;
|
||||
entry->value = v;
|
||||
|
||||
hash = hash_min((uintptr_t)location, hashtable_bits);
|
||||
|
||||
current_head = &relocation_hashtable[hash];
|
||||
|
||||
/* Find matching location (if any) */
|
||||
bool found = false;
|
||||
struct relocation_head *rel_head_iter;
|
||||
|
||||
hlist_for_each_entry(rel_head_iter, current_head, node) {
|
||||
if (rel_head_iter->location == location) {
|
||||
found = true;
|
||||
rel_head = rel_head_iter;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (!found) {
|
||||
rel_head = kmalloc(sizeof(*rel_head), GFP_KERNEL);
|
||||
rel_head->rel_entry =
|
||||
kmalloc(sizeof(struct list_head), GFP_KERNEL);
|
||||
INIT_LIST_HEAD(rel_head->rel_entry);
|
||||
rel_head->location = location;
|
||||
INIT_HLIST_NODE(&rel_head->node);
|
||||
if (!current_head->first) {
|
||||
bucket =
|
||||
kmalloc(sizeof(struct used_bucket), GFP_KERNEL);
|
||||
INIT_LIST_HEAD(&bucket->head);
|
||||
bucket->bucket = current_head;
|
||||
list_add(&bucket->head, &used_buckets_list);
|
||||
}
|
||||
hlist_add_head(&rel_head->node, current_head);
|
||||
}
|
||||
|
||||
/* Add relocation to head of discovered rel_head */
|
||||
list_add_tail(&entry->head, rel_head->rel_entry);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
unsigned int initialize_relocation_hashtable(unsigned int num_relocations)
|
||||
{
|
||||
/* Can safely assume that bits is not greater than sizeof(long) */
|
||||
unsigned long hashtable_size = roundup_pow_of_two(num_relocations);
|
||||
unsigned int hashtable_bits = ilog2(hashtable_size);
|
||||
|
||||
/*
|
||||
* Double size of hashtable if num_relocations * 1.25 is greater than
|
||||
* hashtable_size.
|
||||
*/
|
||||
int should_double_size = ((num_relocations + (num_relocations >> 2)) > (hashtable_size));
|
||||
|
||||
hashtable_bits += should_double_size;
|
||||
|
||||
hashtable_size <<= should_double_size;
|
||||
|
||||
relocation_hashtable = kmalloc_array(hashtable_size,
|
||||
sizeof(*relocation_hashtable),
|
||||
GFP_KERNEL);
|
||||
__hash_init(relocation_hashtable, hashtable_size);
|
||||
|
||||
INIT_LIST_HEAD(&used_buckets_list);
|
||||
|
||||
return hashtable_bits;
|
||||
}
|
||||
|
||||
int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
|
||||
unsigned int symindex, unsigned int relsec,
|
||||
struct module *me)
|
||||
@ -353,11 +736,13 @@ int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
|
||||
unsigned int i, type;
|
||||
Elf_Addr v;
|
||||
int res;
|
||||
unsigned int num_relocations = sechdrs[relsec].sh_size / sizeof(*rel);
|
||||
unsigned int hashtable_bits = initialize_relocation_hashtable(num_relocations);
|
||||
|
||||
pr_debug("Applying relocate section %u to %u\n", relsec,
|
||||
sechdrs[relsec].sh_info);
|
||||
|
||||
for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
|
||||
for (i = 0; i < num_relocations; i++) {
|
||||
/* This is where to make the change */
|
||||
location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
|
||||
+ rel[i].r_offset;
|
||||
@ -375,8 +760,8 @@ int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
|
||||
|
||||
type = ELF_RISCV_R_TYPE(rel[i].r_info);
|
||||
|
||||
if (type < ARRAY_SIZE(reloc_handlers_rela))
|
||||
handler = reloc_handlers_rela[type];
|
||||
if (type < ARRAY_SIZE(reloc_handlers))
|
||||
handler = reloc_handlers[type].reloc_handler;
|
||||
else
|
||||
handler = NULL;
|
||||
|
||||
@ -432,11 +817,16 @@ int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
|
||||
}
|
||||
}
|
||||
|
||||
res = handler(me, location, v);
|
||||
if (reloc_handlers[type].accumulate_handler)
|
||||
res = add_relocation_to_accumulate(me, type, location, hashtable_bits, v);
|
||||
else
|
||||
res = handler(me, location, v);
|
||||
if (res)
|
||||
return res;
|
||||
}
|
||||
|
||||
process_accumulated_relocations(me);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user