1c942fddfSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 2e2c0cdfbSPalmer Dabbelt /* 3e2c0cdfbSPalmer Dabbelt * 4e2c0cdfbSPalmer Dabbelt * Copyright (C) 2017 Zihao Yu 5e2c0cdfbSPalmer Dabbelt */ 6e2c0cdfbSPalmer Dabbelt 7e2c0cdfbSPalmer Dabbelt #include <linux/elf.h> 8e2c0cdfbSPalmer Dabbelt #include <linux/err.h> 9e2c0cdfbSPalmer Dabbelt #include <linux/errno.h> 10e2c0cdfbSPalmer Dabbelt #include <linux/moduleloader.h> 110cff8bffSVincent Chen #include <linux/vmalloc.h> 120cff8bffSVincent Chen #include <linux/sizes.h> 13ca5999fdSMike Rapoport #include <linux/pgtable.h> 14*a8e91016SHeiko Stuebner #include <asm/alternative.h> 150cff8bffSVincent Chen #include <asm/sections.h> 16e2c0cdfbSPalmer Dabbelt 170966d385SEmil Renner Berthing /* 180966d385SEmil Renner Berthing * The auipc+jalr instruction pair can reach any PC-relative offset 190966d385SEmil Renner Berthing * in the range [-2^31 - 2^11, 2^31 - 2^11) 200966d385SEmil Renner Berthing */ 210966d385SEmil Renner Berthing static bool riscv_insn_valid_32bit_offset(ptrdiff_t val) 220966d385SEmil Renner Berthing { 230966d385SEmil Renner Berthing #ifdef CONFIG_32BIT 240966d385SEmil Renner Berthing return true; 250966d385SEmil Renner Berthing #else 260966d385SEmil Renner Berthing return (-(1L << 31) - (1L << 11)) <= val && val < ((1L << 31) - (1L << 11)); 270966d385SEmil Renner Berthing #endif 280966d385SEmil Renner Berthing } 290966d385SEmil Renner Berthing 3077aa85deSAndreas Schwab static int apply_r_riscv_32_rela(struct module *me, u32 *location, Elf_Addr v) 3177aa85deSAndreas Schwab { 3277aa85deSAndreas Schwab if (v != (u32)v) { 3377aa85deSAndreas Schwab pr_err("%s: value %016llx out of range for 32-bit field\n", 34ef3a6140SOlof Johansson me->name, (long long)v); 3577aa85deSAndreas Schwab return -EINVAL; 3677aa85deSAndreas Schwab } 3777aa85deSAndreas Schwab *location = v; 3877aa85deSAndreas Schwab return 0; 3977aa85deSAndreas Schwab } 4077aa85deSAndreas Schwab 41e2c0cdfbSPalmer Dabbelt static int apply_r_riscv_64_rela(struct module *me, u32 *location, Elf_Addr v) 42e2c0cdfbSPalmer Dabbelt { 43e2c0cdfbSPalmer Dabbelt *(u64 *)location = v; 44e2c0cdfbSPalmer Dabbelt return 0; 45e2c0cdfbSPalmer Dabbelt } 46e2c0cdfbSPalmer Dabbelt 47e2c0cdfbSPalmer Dabbelt static int apply_r_riscv_branch_rela(struct module *me, u32 *location, 48e2c0cdfbSPalmer Dabbelt Elf_Addr v) 49e2c0cdfbSPalmer Dabbelt { 507df85002SZong Li ptrdiff_t offset = (void *)v - (void *)location; 51e2c0cdfbSPalmer Dabbelt u32 imm12 = (offset & 0x1000) << (31 - 12); 52e2c0cdfbSPalmer Dabbelt u32 imm11 = (offset & 0x800) >> (11 - 7); 53e2c0cdfbSPalmer Dabbelt u32 imm10_5 = (offset & 0x7e0) << (30 - 10); 54e2c0cdfbSPalmer Dabbelt u32 imm4_1 = (offset & 0x1e) << (11 - 4); 55e2c0cdfbSPalmer Dabbelt 56e2c0cdfbSPalmer Dabbelt *location = (*location & 0x1fff07f) | imm12 | imm11 | imm10_5 | imm4_1; 57e2c0cdfbSPalmer Dabbelt return 0; 58e2c0cdfbSPalmer Dabbelt } 59e2c0cdfbSPalmer Dabbelt 60e2c0cdfbSPalmer Dabbelt static int apply_r_riscv_jal_rela(struct module *me, u32 *location, 61e2c0cdfbSPalmer Dabbelt Elf_Addr v) 62e2c0cdfbSPalmer Dabbelt { 637df85002SZong Li ptrdiff_t offset = (void *)v - (void *)location; 64e2c0cdfbSPalmer Dabbelt u32 imm20 = (offset & 0x100000) << (31 - 20); 65e2c0cdfbSPalmer Dabbelt u32 imm19_12 = (offset & 0xff000); 66e2c0cdfbSPalmer Dabbelt u32 imm11 = (offset & 0x800) << (20 - 11); 67e2c0cdfbSPalmer Dabbelt u32 imm10_1 = (offset & 0x7fe) << (30 - 10); 68e2c0cdfbSPalmer Dabbelt 69e2c0cdfbSPalmer Dabbelt *location = (*location & 0xfff) | imm20 | imm19_12 | imm11 | imm10_1; 70e2c0cdfbSPalmer Dabbelt return 0; 71e2c0cdfbSPalmer Dabbelt } 72e2c0cdfbSPalmer Dabbelt 7361748760SWu Caize static int apply_r_riscv_rvc_branch_rela(struct module *me, u32 *location, 7456ea45aeSZong Li Elf_Addr v) 7556ea45aeSZong Li { 767df85002SZong Li ptrdiff_t offset = (void *)v - (void *)location; 7756ea45aeSZong Li u16 imm8 = (offset & 0x100) << (12 - 8); 7856ea45aeSZong Li u16 imm7_6 = (offset & 0xc0) >> (6 - 5); 7956ea45aeSZong Li u16 imm5 = (offset & 0x20) >> (5 - 2); 8056ea45aeSZong Li u16 imm4_3 = (offset & 0x18) << (12 - 5); 8156ea45aeSZong Li u16 imm2_1 = (offset & 0x6) << (12 - 10); 8256ea45aeSZong Li 8356ea45aeSZong Li *(u16 *)location = (*(u16 *)location & 0xe383) | 8456ea45aeSZong Li imm8 | imm7_6 | imm5 | imm4_3 | imm2_1; 8556ea45aeSZong Li return 0; 8656ea45aeSZong Li } 8756ea45aeSZong Li 8856ea45aeSZong Li static int apply_r_riscv_rvc_jump_rela(struct module *me, u32 *location, 8956ea45aeSZong Li Elf_Addr v) 9056ea45aeSZong Li { 917df85002SZong Li ptrdiff_t offset = (void *)v - (void *)location; 9256ea45aeSZong Li u16 imm11 = (offset & 0x800) << (12 - 11); 9356ea45aeSZong Li u16 imm10 = (offset & 0x400) >> (10 - 8); 9456ea45aeSZong Li u16 imm9_8 = (offset & 0x300) << (12 - 11); 9556ea45aeSZong Li u16 imm7 = (offset & 0x80) >> (7 - 6); 9656ea45aeSZong Li u16 imm6 = (offset & 0x40) << (12 - 11); 9756ea45aeSZong Li u16 imm5 = (offset & 0x20) >> (5 - 2); 9856ea45aeSZong Li u16 imm4 = (offset & 0x10) << (12 - 5); 9956ea45aeSZong Li u16 imm3_1 = (offset & 0xe) << (12 - 10); 10056ea45aeSZong Li 10156ea45aeSZong Li *(u16 *)location = (*(u16 *)location & 0xe003) | 10256ea45aeSZong Li imm11 | imm10 | imm9_8 | imm7 | imm6 | imm5 | imm4 | imm3_1; 10356ea45aeSZong Li return 0; 10456ea45aeSZong Li } 10556ea45aeSZong Li 106e2c0cdfbSPalmer Dabbelt static int apply_r_riscv_pcrel_hi20_rela(struct module *me, u32 *location, 107e2c0cdfbSPalmer Dabbelt Elf_Addr v) 108e2c0cdfbSPalmer Dabbelt { 1097df85002SZong Li ptrdiff_t offset = (void *)v - (void *)location; 110e2c0cdfbSPalmer Dabbelt s32 hi20; 111e2c0cdfbSPalmer Dabbelt 1120966d385SEmil Renner Berthing if (!riscv_insn_valid_32bit_offset(offset)) { 113e2c0cdfbSPalmer Dabbelt pr_err( 114e2c0cdfbSPalmer Dabbelt "%s: target %016llx can not be addressed by the 32-bit offset from PC = %p\n", 115ef3a6140SOlof Johansson me->name, (long long)v, location); 116e2c0cdfbSPalmer Dabbelt return -EINVAL; 117e2c0cdfbSPalmer Dabbelt } 118e2c0cdfbSPalmer Dabbelt 119e2c0cdfbSPalmer Dabbelt hi20 = (offset + 0x800) & 0xfffff000; 120e2c0cdfbSPalmer Dabbelt *location = (*location & 0xfff) | hi20; 121e2c0cdfbSPalmer Dabbelt return 0; 122e2c0cdfbSPalmer Dabbelt } 123e2c0cdfbSPalmer Dabbelt 124e2c0cdfbSPalmer Dabbelt static int apply_r_riscv_pcrel_lo12_i_rela(struct module *me, u32 *location, 125e2c0cdfbSPalmer Dabbelt Elf_Addr v) 126e2c0cdfbSPalmer Dabbelt { 127e2c0cdfbSPalmer Dabbelt /* 128e2c0cdfbSPalmer Dabbelt * v is the lo12 value to fill. It is calculated before calling this 129e2c0cdfbSPalmer Dabbelt * handler. 130e2c0cdfbSPalmer Dabbelt */ 131e2c0cdfbSPalmer Dabbelt *location = (*location & 0xfffff) | ((v & 0xfff) << 20); 132e2c0cdfbSPalmer Dabbelt return 0; 133e2c0cdfbSPalmer Dabbelt } 134e2c0cdfbSPalmer Dabbelt 135e2c0cdfbSPalmer Dabbelt static int apply_r_riscv_pcrel_lo12_s_rela(struct module *me, u32 *location, 136e2c0cdfbSPalmer Dabbelt Elf_Addr v) 137e2c0cdfbSPalmer Dabbelt { 138e2c0cdfbSPalmer Dabbelt /* 139e2c0cdfbSPalmer Dabbelt * v is the lo12 value to fill. It is calculated before calling this 140e2c0cdfbSPalmer Dabbelt * handler. 141e2c0cdfbSPalmer Dabbelt */ 142e2c0cdfbSPalmer Dabbelt u32 imm11_5 = (v & 0xfe0) << (31 - 11); 143e2c0cdfbSPalmer Dabbelt u32 imm4_0 = (v & 0x1f) << (11 - 4); 144e2c0cdfbSPalmer Dabbelt 145e2c0cdfbSPalmer Dabbelt *location = (*location & 0x1fff07f) | imm11_5 | imm4_0; 146e2c0cdfbSPalmer Dabbelt return 0; 147e2c0cdfbSPalmer Dabbelt } 148e2c0cdfbSPalmer Dabbelt 149e7456e69SZong Li static int apply_r_riscv_hi20_rela(struct module *me, u32 *location, 150e7456e69SZong Li Elf_Addr v) 151e7456e69SZong Li { 152e7456e69SZong Li s32 hi20; 153e7456e69SZong Li 154da4ed378SJoe Perches if (IS_ENABLED(CONFIG_CMODEL_MEDLOW)) { 155e7456e69SZong Li pr_err( 156e7456e69SZong Li "%s: target %016llx can not be addressed by the 32-bit offset from PC = %p\n", 157ef3a6140SOlof Johansson me->name, (long long)v, location); 158e7456e69SZong Li return -EINVAL; 159e7456e69SZong Li } 160e7456e69SZong Li 161e7456e69SZong Li hi20 = ((s32)v + 0x800) & 0xfffff000; 162e7456e69SZong Li *location = (*location & 0xfff) | hi20; 163e7456e69SZong Li return 0; 164e7456e69SZong Li } 165e7456e69SZong Li 166e7456e69SZong Li static int apply_r_riscv_lo12_i_rela(struct module *me, u32 *location, 167e7456e69SZong Li Elf_Addr v) 168e7456e69SZong Li { 169e7456e69SZong Li /* Skip medlow checking because of filtering by HI20 already */ 170e7456e69SZong Li s32 hi20 = ((s32)v + 0x800) & 0xfffff000; 171e7456e69SZong Li s32 lo12 = ((s32)v - hi20); 172e7456e69SZong Li *location = (*location & 0xfffff) | ((lo12 & 0xfff) << 20); 173e7456e69SZong Li return 0; 174e7456e69SZong Li } 175e7456e69SZong Li 176e7456e69SZong Li static int apply_r_riscv_lo12_s_rela(struct module *me, u32 *location, 177e7456e69SZong Li Elf_Addr v) 178e7456e69SZong Li { 179e7456e69SZong Li /* Skip medlow checking because of filtering by HI20 already */ 180e7456e69SZong Li s32 hi20 = ((s32)v + 0x800) & 0xfffff000; 181e7456e69SZong Li s32 lo12 = ((s32)v - hi20); 182e7456e69SZong Li u32 imm11_5 = (lo12 & 0xfe0) << (31 - 11); 183e7456e69SZong Li u32 imm4_0 = (lo12 & 0x1f) << (11 - 4); 184e7456e69SZong Li *location = (*location & 0x1fff07f) | imm11_5 | imm4_0; 185e7456e69SZong Li return 0; 186e7456e69SZong Li } 187e7456e69SZong Li 188da975dd4SZong Li static int apply_r_riscv_got_hi20_rela(struct module *me, u32 *location, 189da975dd4SZong Li Elf_Addr v) 190da975dd4SZong Li { 1917df85002SZong Li ptrdiff_t offset = (void *)v - (void *)location; 192da975dd4SZong Li s32 hi20; 193da975dd4SZong Li 194da975dd4SZong Li /* Always emit the got entry */ 195da975dd4SZong Li if (IS_ENABLED(CONFIG_MODULE_SECTIONS)) { 196da975dd4SZong Li offset = module_emit_got_entry(me, v); 197da975dd4SZong Li offset = (void *)offset - (void *)location; 198da975dd4SZong Li } else { 199da975dd4SZong Li pr_err( 200da975dd4SZong Li "%s: can not generate the GOT entry for symbol = %016llx from PC = %p\n", 201ef3a6140SOlof Johansson me->name, (long long)v, location); 202da975dd4SZong Li return -EINVAL; 203da975dd4SZong Li } 204da975dd4SZong Li 205da975dd4SZong Li hi20 = (offset + 0x800) & 0xfffff000; 206da975dd4SZong Li *location = (*location & 0xfff) | hi20; 207da975dd4SZong Li return 0; 208da975dd4SZong Li } 209da975dd4SZong Li 210e2c0cdfbSPalmer Dabbelt static int apply_r_riscv_call_plt_rela(struct module *me, u32 *location, 211e2c0cdfbSPalmer Dabbelt Elf_Addr v) 212e2c0cdfbSPalmer Dabbelt { 2137df85002SZong Li ptrdiff_t offset = (void *)v - (void *)location; 214e2c0cdfbSPalmer Dabbelt u32 hi20, lo12; 215e2c0cdfbSPalmer Dabbelt 2160966d385SEmil Renner Berthing if (!riscv_insn_valid_32bit_offset(offset)) { 217da975dd4SZong Li /* Only emit the plt entry if offset over 32-bit range */ 218da975dd4SZong Li if (IS_ENABLED(CONFIG_MODULE_SECTIONS)) { 219da975dd4SZong Li offset = module_emit_plt_entry(me, v); 220da975dd4SZong Li offset = (void *)offset - (void *)location; 221da975dd4SZong Li } else { 222e2c0cdfbSPalmer Dabbelt pr_err( 223e2c0cdfbSPalmer Dabbelt "%s: target %016llx can not be addressed by the 32-bit offset from PC = %p\n", 224ef3a6140SOlof Johansson me->name, (long long)v, location); 225e2c0cdfbSPalmer Dabbelt return -EINVAL; 226e2c0cdfbSPalmer Dabbelt } 227da975dd4SZong Li } 228e2c0cdfbSPalmer Dabbelt 229e2c0cdfbSPalmer Dabbelt hi20 = (offset + 0x800) & 0xfffff000; 230e2c0cdfbSPalmer Dabbelt lo12 = (offset - hi20) & 0xfff; 231e2c0cdfbSPalmer Dabbelt *location = (*location & 0xfff) | hi20; 232e2c0cdfbSPalmer Dabbelt *(location + 1) = (*(location + 1) & 0xfffff) | (lo12 << 20); 233e2c0cdfbSPalmer Dabbelt return 0; 234e2c0cdfbSPalmer Dabbelt } 235e2c0cdfbSPalmer Dabbelt 236e1910c72SZong Li static int apply_r_riscv_call_rela(struct module *me, u32 *location, 237e1910c72SZong Li Elf_Addr v) 238e1910c72SZong Li { 2397df85002SZong Li ptrdiff_t offset = (void *)v - (void *)location; 240e1910c72SZong Li u32 hi20, lo12; 241e1910c72SZong Li 2420966d385SEmil Renner Berthing if (!riscv_insn_valid_32bit_offset(offset)) { 243e1910c72SZong Li pr_err( 244e1910c72SZong Li "%s: target %016llx can not be addressed by the 32-bit offset from PC = %p\n", 245ef3a6140SOlof Johansson me->name, (long long)v, location); 246e1910c72SZong Li return -EINVAL; 247e1910c72SZong Li } 248e1910c72SZong Li 249e1910c72SZong Li hi20 = (offset + 0x800) & 0xfffff000; 250e1910c72SZong Li lo12 = (offset - hi20) & 0xfff; 251e1910c72SZong Li *location = (*location & 0xfff) | hi20; 252e1910c72SZong Li *(location + 1) = (*(location + 1) & 0xfffff) | (lo12 << 20); 253e1910c72SZong Li return 0; 254e1910c72SZong Li } 255e1910c72SZong Li 256e2c0cdfbSPalmer Dabbelt static int apply_r_riscv_relax_rela(struct module *me, u32 *location, 257e2c0cdfbSPalmer Dabbelt Elf_Addr v) 258e2c0cdfbSPalmer Dabbelt { 259e2c0cdfbSPalmer Dabbelt return 0; 260e2c0cdfbSPalmer Dabbelt } 261e2c0cdfbSPalmer Dabbelt 26229e405cdSZong Li static int apply_r_riscv_align_rela(struct module *me, u32 *location, 26329e405cdSZong Li Elf_Addr v) 26429e405cdSZong Li { 26529e405cdSZong Li pr_err( 26629e405cdSZong Li "%s: The unexpected relocation type 'R_RISCV_ALIGN' from PC = %p\n", 26729e405cdSZong Li me->name, location); 26829e405cdSZong Li return -EINVAL; 26929e405cdSZong Li } 27029e405cdSZong Li 2718e691b16SZong Li static int apply_r_riscv_add32_rela(struct module *me, u32 *location, 2728e691b16SZong Li Elf_Addr v) 2738e691b16SZong Li { 274781c8fe2SAndreas Schwab *(u32 *)location += (u32)v; 2758e691b16SZong Li return 0; 2768e691b16SZong Li } 2778e691b16SZong Li 27811a54f42SEmil Renner Berthing static int apply_r_riscv_add64_rela(struct module *me, u32 *location, 27911a54f42SEmil Renner Berthing Elf_Addr v) 28011a54f42SEmil Renner Berthing { 28111a54f42SEmil Renner Berthing *(u64 *)location += (u64)v; 28211a54f42SEmil Renner Berthing return 0; 28311a54f42SEmil Renner Berthing } 28411a54f42SEmil Renner Berthing 2854aad074cSZong Li static int apply_r_riscv_sub32_rela(struct module *me, u32 *location, 2864aad074cSZong Li Elf_Addr v) 2874aad074cSZong Li { 288781c8fe2SAndreas Schwab *(u32 *)location -= (u32)v; 2894aad074cSZong Li return 0; 2904aad074cSZong Li } 2914aad074cSZong Li 29211a54f42SEmil Renner Berthing static int apply_r_riscv_sub64_rela(struct module *me, u32 *location, 29311a54f42SEmil Renner Berthing Elf_Addr v) 29411a54f42SEmil Renner Berthing { 29511a54f42SEmil Renner Berthing *(u64 *)location -= (u64)v; 29611a54f42SEmil Renner Berthing return 0; 29711a54f42SEmil Renner Berthing } 29811a54f42SEmil Renner Berthing 299e2c0cdfbSPalmer Dabbelt static int (*reloc_handlers_rela[]) (struct module *me, u32 *location, 300e2c0cdfbSPalmer Dabbelt Elf_Addr v) = { 30177aa85deSAndreas Schwab [R_RISCV_32] = apply_r_riscv_32_rela, 302e2c0cdfbSPalmer Dabbelt [R_RISCV_64] = apply_r_riscv_64_rela, 303e2c0cdfbSPalmer Dabbelt [R_RISCV_BRANCH] = apply_r_riscv_branch_rela, 304e2c0cdfbSPalmer Dabbelt [R_RISCV_JAL] = apply_r_riscv_jal_rela, 30561748760SWu Caize [R_RISCV_RVC_BRANCH] = apply_r_riscv_rvc_branch_rela, 30656ea45aeSZong Li [R_RISCV_RVC_JUMP] = apply_r_riscv_rvc_jump_rela, 307e2c0cdfbSPalmer Dabbelt [R_RISCV_PCREL_HI20] = apply_r_riscv_pcrel_hi20_rela, 308e2c0cdfbSPalmer Dabbelt [R_RISCV_PCREL_LO12_I] = apply_r_riscv_pcrel_lo12_i_rela, 309e2c0cdfbSPalmer Dabbelt [R_RISCV_PCREL_LO12_S] = apply_r_riscv_pcrel_lo12_s_rela, 310e7456e69SZong Li [R_RISCV_HI20] = apply_r_riscv_hi20_rela, 311e7456e69SZong Li [R_RISCV_LO12_I] = apply_r_riscv_lo12_i_rela, 312e7456e69SZong Li [R_RISCV_LO12_S] = apply_r_riscv_lo12_s_rela, 313da975dd4SZong Li [R_RISCV_GOT_HI20] = apply_r_riscv_got_hi20_rela, 314e2c0cdfbSPalmer Dabbelt [R_RISCV_CALL_PLT] = apply_r_riscv_call_plt_rela, 315e1910c72SZong Li [R_RISCV_CALL] = apply_r_riscv_call_rela, 316e2c0cdfbSPalmer Dabbelt [R_RISCV_RELAX] = apply_r_riscv_relax_rela, 31729e405cdSZong Li [R_RISCV_ALIGN] = apply_r_riscv_align_rela, 3188e691b16SZong Li [R_RISCV_ADD32] = apply_r_riscv_add32_rela, 31911a54f42SEmil Renner Berthing [R_RISCV_ADD64] = apply_r_riscv_add64_rela, 3204aad074cSZong Li [R_RISCV_SUB32] = apply_r_riscv_sub32_rela, 32111a54f42SEmil Renner Berthing [R_RISCV_SUB64] = apply_r_riscv_sub64_rela, 322e2c0cdfbSPalmer Dabbelt }; 323e2c0cdfbSPalmer Dabbelt 324e2c0cdfbSPalmer Dabbelt int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab, 325e2c0cdfbSPalmer Dabbelt unsigned int symindex, unsigned int relsec, 326e2c0cdfbSPalmer Dabbelt struct module *me) 327e2c0cdfbSPalmer Dabbelt { 328e2c0cdfbSPalmer Dabbelt Elf_Rela *rel = (void *) sechdrs[relsec].sh_addr; 329e2c0cdfbSPalmer Dabbelt int (*handler)(struct module *me, u32 *location, Elf_Addr v); 330e2c0cdfbSPalmer Dabbelt Elf_Sym *sym; 331e2c0cdfbSPalmer Dabbelt u32 *location; 332e2c0cdfbSPalmer Dabbelt unsigned int i, type; 333e2c0cdfbSPalmer Dabbelt Elf_Addr v; 334e2c0cdfbSPalmer Dabbelt int res; 335e2c0cdfbSPalmer Dabbelt 336e2c0cdfbSPalmer Dabbelt pr_debug("Applying relocate section %u to %u\n", relsec, 337e2c0cdfbSPalmer Dabbelt sechdrs[relsec].sh_info); 338e2c0cdfbSPalmer Dabbelt 339e2c0cdfbSPalmer Dabbelt for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { 340e2c0cdfbSPalmer Dabbelt /* This is where to make the change */ 341e2c0cdfbSPalmer Dabbelt location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr 342e2c0cdfbSPalmer Dabbelt + rel[i].r_offset; 343e2c0cdfbSPalmer Dabbelt /* This is the symbol it is referring to */ 344e2c0cdfbSPalmer Dabbelt sym = (Elf_Sym *)sechdrs[symindex].sh_addr 345e2c0cdfbSPalmer Dabbelt + ELF_RISCV_R_SYM(rel[i].r_info); 346e2c0cdfbSPalmer Dabbelt if (IS_ERR_VALUE(sym->st_value)) { 347e2c0cdfbSPalmer Dabbelt /* Ignore unresolved weak symbol */ 348e2c0cdfbSPalmer Dabbelt if (ELF_ST_BIND(sym->st_info) == STB_WEAK) 349e2c0cdfbSPalmer Dabbelt continue; 35004ce8d3fSKefeng Wang pr_warn("%s: Unknown symbol %s\n", 351e2c0cdfbSPalmer Dabbelt me->name, strtab + sym->st_name); 352e2c0cdfbSPalmer Dabbelt return -ENOENT; 353e2c0cdfbSPalmer Dabbelt } 354e2c0cdfbSPalmer Dabbelt 355e2c0cdfbSPalmer Dabbelt type = ELF_RISCV_R_TYPE(rel[i].r_info); 356e2c0cdfbSPalmer Dabbelt 357e2c0cdfbSPalmer Dabbelt if (type < ARRAY_SIZE(reloc_handlers_rela)) 358e2c0cdfbSPalmer Dabbelt handler = reloc_handlers_rela[type]; 359e2c0cdfbSPalmer Dabbelt else 360e2c0cdfbSPalmer Dabbelt handler = NULL; 361e2c0cdfbSPalmer Dabbelt 362e2c0cdfbSPalmer Dabbelt if (!handler) { 363e2c0cdfbSPalmer Dabbelt pr_err("%s: Unknown relocation type %u\n", 364e2c0cdfbSPalmer Dabbelt me->name, type); 365e2c0cdfbSPalmer Dabbelt return -EINVAL; 366e2c0cdfbSPalmer Dabbelt } 367e2c0cdfbSPalmer Dabbelt 368e2c0cdfbSPalmer Dabbelt v = sym->st_value + rel[i].r_addend; 369e2c0cdfbSPalmer Dabbelt 370e2c0cdfbSPalmer Dabbelt if (type == R_RISCV_PCREL_LO12_I || type == R_RISCV_PCREL_LO12_S) { 371e2c0cdfbSPalmer Dabbelt unsigned int j; 372e2c0cdfbSPalmer Dabbelt 373e2c0cdfbSPalmer Dabbelt for (j = 0; j < sechdrs[relsec].sh_size / sizeof(*rel); j++) { 3747df85002SZong Li unsigned long hi20_loc = 375e2c0cdfbSPalmer Dabbelt sechdrs[sechdrs[relsec].sh_info].sh_addr 376e2c0cdfbSPalmer Dabbelt + rel[j].r_offset; 377da975dd4SZong Li u32 hi20_type = ELF_RISCV_R_TYPE(rel[j].r_info); 378da975dd4SZong Li 379da975dd4SZong Li /* Find the corresponding HI20 relocation entry */ 380da975dd4SZong Li if (hi20_loc == sym->st_value 381da975dd4SZong Li && (hi20_type == R_RISCV_PCREL_HI20 382da975dd4SZong Li || hi20_type == R_RISCV_GOT_HI20)) { 383da975dd4SZong Li s32 hi20, lo12; 384e2c0cdfbSPalmer Dabbelt Elf_Sym *hi20_sym = 385e2c0cdfbSPalmer Dabbelt (Elf_Sym *)sechdrs[symindex].sh_addr 386e2c0cdfbSPalmer Dabbelt + ELF_RISCV_R_SYM(rel[j].r_info); 3877df85002SZong Li unsigned long hi20_sym_val = 388e2c0cdfbSPalmer Dabbelt hi20_sym->st_value 389e2c0cdfbSPalmer Dabbelt + rel[j].r_addend; 390da975dd4SZong Li 391e2c0cdfbSPalmer Dabbelt /* Calculate lo12 */ 3927df85002SZong Li size_t offset = hi20_sym_val - hi20_loc; 393da975dd4SZong Li if (IS_ENABLED(CONFIG_MODULE_SECTIONS) 394da975dd4SZong Li && hi20_type == R_RISCV_GOT_HI20) { 395da975dd4SZong Li offset = module_emit_got_entry( 396da975dd4SZong Li me, hi20_sym_val); 397da975dd4SZong Li offset = offset - hi20_loc; 398da975dd4SZong Li } 399da975dd4SZong Li hi20 = (offset + 0x800) & 0xfffff000; 400da975dd4SZong Li lo12 = offset - hi20; 401e2c0cdfbSPalmer Dabbelt v = lo12; 402da975dd4SZong Li 403e2c0cdfbSPalmer Dabbelt break; 404e2c0cdfbSPalmer Dabbelt } 405e2c0cdfbSPalmer Dabbelt } 406e2c0cdfbSPalmer Dabbelt if (j == sechdrs[relsec].sh_size / sizeof(*rel)) { 407e2c0cdfbSPalmer Dabbelt pr_err( 408da975dd4SZong Li "%s: Can not find HI20 relocation information\n", 409e2c0cdfbSPalmer Dabbelt me->name); 410e2c0cdfbSPalmer Dabbelt return -EINVAL; 411e2c0cdfbSPalmer Dabbelt } 412e2c0cdfbSPalmer Dabbelt } 413e2c0cdfbSPalmer Dabbelt 414e2c0cdfbSPalmer Dabbelt res = handler(me, location, v); 415e2c0cdfbSPalmer Dabbelt if (res) 416e2c0cdfbSPalmer Dabbelt return res; 417e2c0cdfbSPalmer Dabbelt } 418e2c0cdfbSPalmer Dabbelt 419e2c0cdfbSPalmer Dabbelt return 0; 420e2c0cdfbSPalmer Dabbelt } 4210cff8bffSVincent Chen 4220cff8bffSVincent Chen #if defined(CONFIG_MMU) && defined(CONFIG_64BIT) 4230cff8bffSVincent Chen void *module_alloc(unsigned long size) 4240cff8bffSVincent Chen { 4252bfc6cd8SAlexandre Ghiti return __vmalloc_node_range(size, 1, MODULES_VADDR, 4262bfc6cd8SAlexandre Ghiti MODULES_END, GFP_KERNEL, 4275387054bSJisheng Zhang PAGE_KERNEL, 0, NUMA_NO_NODE, 4280cff8bffSVincent Chen __builtin_return_address(0)); 4290cff8bffSVincent Chen } 4300cff8bffSVincent Chen #endif 431*a8e91016SHeiko Stuebner 432*a8e91016SHeiko Stuebner static const Elf_Shdr *find_section(const Elf_Ehdr *hdr, 433*a8e91016SHeiko Stuebner const Elf_Shdr *sechdrs, 434*a8e91016SHeiko Stuebner const char *name) 435*a8e91016SHeiko Stuebner { 436*a8e91016SHeiko Stuebner const Elf_Shdr *s, *se; 437*a8e91016SHeiko Stuebner const char *secstrs = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; 438*a8e91016SHeiko Stuebner 439*a8e91016SHeiko Stuebner for (s = sechdrs, se = sechdrs + hdr->e_shnum; s < se; s++) { 440*a8e91016SHeiko Stuebner if (strcmp(name, secstrs + s->sh_name) == 0) 441*a8e91016SHeiko Stuebner return s; 442*a8e91016SHeiko Stuebner } 443*a8e91016SHeiko Stuebner 444*a8e91016SHeiko Stuebner return NULL; 445*a8e91016SHeiko Stuebner } 446*a8e91016SHeiko Stuebner 447*a8e91016SHeiko Stuebner int module_finalize(const Elf_Ehdr *hdr, 448*a8e91016SHeiko Stuebner const Elf_Shdr *sechdrs, 449*a8e91016SHeiko Stuebner struct module *me) 450*a8e91016SHeiko Stuebner { 451*a8e91016SHeiko Stuebner const Elf_Shdr *s; 452*a8e91016SHeiko Stuebner 453*a8e91016SHeiko Stuebner s = find_section(hdr, sechdrs, ".alternative"); 454*a8e91016SHeiko Stuebner if (s) 455*a8e91016SHeiko Stuebner apply_module_alternatives((void *)s->sh_addr, s->sh_size); 456*a8e91016SHeiko Stuebner 457*a8e91016SHeiko Stuebner return 0; 458*a8e91016SHeiko Stuebner } 459