Warning: That file was not part of the compilation database. It may have many parsing errors.
1 | // SPDX-License-Identifier: GPL-2.0 |
---|---|
2 | #include <linux/export.h> |
3 | #include <linux/sched.h> |
4 | #include <linux/personality.h> |
5 | #include <linux/binfmts.h> |
6 | #include <linux/elf.h> |
7 | #include <linux/elf-fdpic.h> |
8 | #include <asm/system_info.h> |
9 | |
10 | int elf_check_arch(const struct elf32_hdr *x) |
11 | { |
12 | unsigned int eflags; |
13 | |
14 | /* Make sure it's an ARM executable */ |
15 | if (x->e_machine != EM_ARM) |
16 | return 0; |
17 | |
18 | /* Make sure the entry address is reasonable */ |
19 | if (x->e_entry & 1) { |
20 | if (!(elf_hwcap & HWCAP_THUMB)) |
21 | return 0; |
22 | } else if (x->e_entry & 3) |
23 | return 0; |
24 | |
25 | eflags = x->e_flags; |
26 | if ((eflags & EF_ARM_EABI_MASK) == EF_ARM_EABI_UNKNOWN) { |
27 | unsigned int flt_fmt; |
28 | |
29 | /* APCS26 is only allowed if the CPU supports it */ |
30 | if ((eflags & EF_ARM_APCS_26) && !(elf_hwcap & HWCAP_26BIT)) |
31 | return 0; |
32 | |
33 | flt_fmt = eflags & (EF_ARM_VFP_FLOAT | EF_ARM_SOFT_FLOAT); |
34 | |
35 | /* VFP requires the supporting code */ |
36 | if (flt_fmt == EF_ARM_VFP_FLOAT && !(elf_hwcap & HWCAP_VFP)) |
37 | return 0; |
38 | } |
39 | return 1; |
40 | } |
41 | EXPORT_SYMBOL(elf_check_arch); |
42 | |
43 | void elf_set_personality(const struct elf32_hdr *x) |
44 | { |
45 | unsigned int eflags = x->e_flags; |
46 | unsigned int personality = current->personality & ~PER_MASK; |
47 | |
48 | /* |
49 | * We only support Linux ELF executables, so always set the |
50 | * personality to LINUX. |
51 | */ |
52 | personality |= PER_LINUX; |
53 | |
54 | /* |
55 | * APCS-26 is only valid for OABI executables |
56 | */ |
57 | if ((eflags & EF_ARM_EABI_MASK) == EF_ARM_EABI_UNKNOWN && |
58 | (eflags & EF_ARM_APCS_26)) |
59 | personality &= ~ADDR_LIMIT_32BIT; |
60 | else |
61 | personality |= ADDR_LIMIT_32BIT; |
62 | |
63 | set_personality(personality); |
64 | |
65 | /* |
66 | * Since the FPA coprocessor uses CP1 and CP2, and iWMMXt uses CP0 |
67 | * and CP1, we only enable access to the iWMMXt coprocessor if the |
68 | * binary is EABI or softfloat (and thus, guaranteed not to use |
69 | * FPA instructions.) |
70 | */ |
71 | if (elf_hwcap & HWCAP_IWMMXT && |
72 | eflags & (EF_ARM_EABI_MASK | EF_ARM_SOFT_FLOAT)) { |
73 | set_thread_flag(TIF_USING_IWMMXT); |
74 | } else { |
75 | clear_thread_flag(TIF_USING_IWMMXT); |
76 | } |
77 | } |
78 | EXPORT_SYMBOL(elf_set_personality); |
79 | |
80 | /* |
81 | * Set READ_IMPLIES_EXEC if: |
82 | * - the binary requires an executable stack |
83 | * - we're running on a CPU which doesn't support NX. |
84 | */ |
85 | int arm_elf_read_implies_exec(int executable_stack) |
86 | { |
87 | if (executable_stack != EXSTACK_DISABLE_X) |
88 | return 1; |
89 | if (cpu_architecture() < CPU_ARCH_ARMv6) |
90 | return 1; |
91 | return 0; |
92 | } |
93 | EXPORT_SYMBOL(arm_elf_read_implies_exec); |
94 | |
95 | #if defined(CONFIG_MMU) && defined(CONFIG_BINFMT_ELF_FDPIC) |
96 | |
97 | void elf_fdpic_arch_lay_out_mm(struct elf_fdpic_params *exec_params, |
98 | struct elf_fdpic_params *interp_params, |
99 | unsigned long *start_stack, |
100 | unsigned long *start_brk) |
101 | { |
102 | elf_set_personality(&exec_params->hdr); |
103 | |
104 | exec_params->load_addr = 0x8000; |
105 | interp_params->load_addr = ELF_ET_DYN_BASE; |
106 | *start_stack = TASK_SIZE - SZ_16M; |
107 | |
108 | if ((exec_params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) == ELF_FDPIC_FLAG_INDEPENDENT) { |
109 | exec_params->flags &= ~ELF_FDPIC_FLAG_ARRANGEMENT; |
110 | exec_params->flags |= ELF_FDPIC_FLAG_CONSTDISP; |
111 | } |
112 | } |
113 | |
114 | #endif |
115 |
Warning: That file was not part of the compilation database. It may have many parsing errors.