projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
| ecea4ab6 | 2 | #include <linux/export.h> |
| 8ec53663 RK |
3 | #include <linux/sched.h> |
| 4 | #include <linux/personality.h> | |
| 5 | #include <linux/binfmts.h> | |
| 6 | #include <linux/elf.h> | |
| 9f97da78 | 7 | #include <asm/system_info.h> |
| 8ec53663 RK |
8 | |
| 9 | int elf_check_arch(const struct elf32_hdr *x) | |
| 10 | { | |
| 11 | unsigned int eflags; | |
| 12 | ||
| 13 | /* Make sure it's an ARM executable */ | |
| 14 | if (x->e_machine != EM_ARM) | |
| 15 | return 0; | |
| 16 | ||
| 17 | /* Make sure the entry address is reasonable */ | |
| 18 | if (x->e_entry & 1) { | |
| 19 | if (!(elf_hwcap & HWCAP_THUMB)) | |
| 20 | return 0; | |
| 21 | } else if (x->e_entry & 3) | |
| 22 | return 0; | |
| 23 | ||
| 24 | eflags = x->e_flags; | |
| 25 | if ((eflags & EF_ARM_EABI_MASK) == EF_ARM_EABI_UNKNOWN) { | |
| d2ed5cb8 RK |
26 | unsigned int flt_fmt; |
| 27 | ||
| 8ec53663 RK |
28 | /* APCS26 is only allowed if the CPU supports it */ |
| 29 | if ((eflags & EF_ARM_APCS_26) && !(elf_hwcap & HWCAP_26BIT)) | |
| 30 | return 0; | |
| 31 | ||
| d2ed5cb8 RK |
32 | flt_fmt = eflags & (EF_ARM_VFP_FLOAT | EF_ARM_SOFT_FLOAT); |
| 33 | ||
| 8ec53663 | 34 | /* VFP requires the supporting code */ |
| d2ed5cb8 | 35 | if (flt_fmt == EF_ARM_VFP_FLOAT && !(elf_hwcap & HWCAP_VFP)) |
| 8ec53663 RK |
36 | return 0; |
| 37 | } | |
| 38 | return 1; | |
| 39 | } | |
| 40 | EXPORT_SYMBOL(elf_check_arch); | |
| 41 | ||
| 42 | void elf_set_personality(const struct elf32_hdr *x) | |
| 43 | { | |
| 44 | unsigned int eflags = x->e_flags; | |
| 5e143436 NP |
45 | unsigned int personality = current->personality & ~PER_MASK; |
| 46 | ||
| 47 | /* | |
| 48 | * We only support Linux ELF executables, so always set the | |
| 49 | * personality to LINUX. | |
| 50 | */ | |
| 51 | personality |= PER_LINUX; | |
| 8ec53663 RK |
52 | |
| 53 | /* | |
| 54 | * APCS-26 is only valid for OABI executables | |
| 55 | */ | |
| 5e143436 NP |
56 | if ((eflags & EF_ARM_EABI_MASK) == EF_ARM_EABI_UNKNOWN && |
| 57 | (eflags & EF_ARM_APCS_26)) | |
| 58 | personality &= ~ADDR_LIMIT_32BIT; | |
| 59 | else | |
| 60 | personality |= ADDR_LIMIT_32BIT; | |
| 8ec53663 RK |
61 | |
| 62 | set_personality(personality); | |
| 63 | ||
| 64 | /* | |
| 65 | * Since the FPA coprocessor uses CP1 and CP2, and iWMMXt uses CP0 | |
| 66 | * and CP1, we only enable access to the iWMMXt coprocessor if the | |
| 67 | * binary is EABI or softfloat (and thus, guaranteed not to use | |
| 68 | * FPA instructions.) | |
| 69 | */ | |
| 70 | if (elf_hwcap & HWCAP_IWMMXT && | |
| 71 | eflags & (EF_ARM_EABI_MASK | EF_ARM_SOFT_FLOAT)) { | |
| 72 | set_thread_flag(TIF_USING_IWMMXT); | |
| 73 | } else { | |
| 74 | clear_thread_flag(TIF_USING_IWMMXT); | |
| 75 | } | |
| 76 | } | |
| 77 | EXPORT_SYMBOL(elf_set_personality); | |
| 78 | ||
| 79 | /* | |
| 80 | * Set READ_IMPLIES_EXEC if: | |
| 81 | * - the binary requires an executable stack | |
| 82 | * - we're running on a CPU which doesn't support NX. | |
| 83 | */ | |
| 84 | int arm_elf_read_implies_exec(const struct elf32_hdr *x, int executable_stack) | |
| 85 | { | |
| 9da616fb | 86 | if (executable_stack != EXSTACK_DISABLE_X) |
| 8ec53663 | 87 | return 1; |
| 9da616fb | 88 | if (cpu_architecture() < CPU_ARCH_ARMv6) |
| 8ec53663 RK |
89 | return 1; |
| 90 | return 0; | |
| 91 | } | |
| 92 | EXPORT_SYMBOL(arm_elf_read_implies_exec); |