1 files changed, 53 insertions, 0 deletions

diff --git a/arch/arm/kernel/module.c b/arch/arm/kernel/module.c
index bac03c81489d..f28c5e9c51ea 100644
--- a/arch/arm/kernel/module.c
+++ b/arch/arm/kernel/module.c
@@ -102,6 +102,7 @@ apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex,
                 unsigned long loc;
                 Elf32_Sym *sym;
                 s32 offset;
+                u32 upper, lower, sign, j1, j2;
 
                 offset = ELF32_R_SYM(rel->r_info);
                 if (offset < 0 || offset > (symsec->sh_size / sizeof(Elf32_Sym))) {
@@ -184,6 +185,58 @@ apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex,
                                         (offset & 0x0fff);
                         break;
 
+                case R_ARM_THM_CALL:
+                case R_ARM_THM_JUMP24:
+                        upper = *(u16 *)loc;
+                        lower = *(u16 *)(loc + 2);
+
+                        /*
+                         * 25 bit signed address range (Thumb-2 BL and B.W
+                         * instructions):
+                         *   S:I1:I2:imm10:imm11:0
+                         * where:
+                         *   S     = upper[10]   = offset[24]
+                         *   I1    = ~(J1 ^ S)   = offset[23]
+                         *   I2    = ~(J2 ^ S)   = offset[22]
+                         *   imm10 = upper[9:0]  = offset[21:12]
+                         *   imm11 = lower[10:0] = offset[11:1]
+                         *   J1    = lower[13]
+                         *   J2    = lower[11]
+                         */
+                        sign = (upper >> 10) & 1;
+                        j1 = (lower >> 13) & 1;
+                        j2 = (lower >> 11) & 1;
+                        offset = (sign << 24) | ((~(j1 ^ sign) & 1) << 23) |
+                                ((~(j2 ^ sign) & 1) << 22) |
+                                ((upper & 0x03ff) << 12) |
+                                ((lower & 0x07ff) << 1);
+                        if (offset & 0x01000000)
+                                offset -= 0x02000000;
+                        offset += sym->st_value - loc;
+
+                        /* only Thumb addresses allowed (no interworking) */
+                        if (!(offset & 1) ||
+                            offset <= (s32)0xff000000 ||
+                            offset >= (s32)0x01000000) {
+                                printk(KERN_ERR
+                                       "%s: relocation out of range, section "
+                                       "%d reloc %d sym '%s'\n", module->name,
+                                       relindex, i, strtab + sym->st_name);
+                                return -ENOEXEC;
+                        }
+
+                        sign = (offset >> 24) & 1;
+                        j1 = sign ^ (~(offset >> 23) & 1);
+                        j2 = sign ^ (~(offset >> 22) & 1);
+                        *(u16 *)loc = (u16)((upper & 0xf800) | (sign << 10) |
+                                            ((offset >> 12) & 0x03ff));
+                        *(u16 *)(loc + 2) = (u16)((lower & 0xd000) |
+                                                  (j1 << 13) | (j2 << 11) |
+                                                  ((offset >> 1) & 0x07ff));
+                        upper = *(u16 *)loc;
+                        lower = *(u16 *)(loc + 2);
+                        break;
+
                 default:
                         printk(KERN_ERR "%s: unknown relocation: %u\n",
                                module->name, ELF32_R_TYPE(rel->r_info));