| 1 | /* |
| 2 | * PowerPC linux replacement vdso. |
| 3 | * |
| 4 | * Copyright 2023 Linaro, Ltd. |
| 5 | * |
| 6 | * SPDX-License-Identifier: GPL-2.0-or-later |
| 7 | */ |
| 8 | |
| 9 | #include <asm/unistd.h> |
| 10 | #include <asm/errno.h> |
| 11 | |
| 12 | #ifndef _ARCH_PPC64 |
| 13 | # define TARGET_ABI32 |
| 14 | #endif |
| 15 | #include "vdso-asmoffset.h" |
| 16 | |
| 17 | |
| 18 | .text |
| 19 | |
| 20 | .macro endf name |
| 21 | .globl \name |
| 22 | .size \name, .-\name |
| 23 | /* For PPC64, functions have special linkage; we export pointers. */ |
| 24 | #ifndef _ARCH_PPC64 |
| 25 | .type \name, @function |
| 26 | #endif |
| 27 | .endm |
| 28 | |
| 29 | .macro raw_syscall nr |
| 30 | addi 0, 0, \nr |
| 31 | sc |
| 32 | .endm |
| 33 | |
| 34 | .macro vdso_syscall name, nr |
| 35 | \name: |
| 36 | raw_syscall \nr |
| 37 | blr |
| 38 | endf \name |
| 39 | .endm |
| 40 | |
| 41 | .cfi_startproc |
| 42 | |
| 43 | vdso_syscall __kernel_gettimeofday, __NR_gettimeofday |
| 44 | vdso_syscall __kernel_clock_gettime, __NR_clock_gettime |
| 45 | vdso_syscall __kernel_clock_getres, __NR_clock_getres |
| 46 | vdso_syscall __kernel_getcpu, __NR_getcpu |
| 47 | vdso_syscall __kernel_time, __NR_time |
| 48 | |
| 49 | #ifdef __NR_clock_gettime64 |
| 50 | vdso_syscall __kernel_clock_gettime64, __NR_clock_gettime64 |
| 51 | #endif |
| 52 | |
| 53 | __kernel_sync_dicache: |
| 54 | /* qemu does not need to flush caches */ |
| 55 | blr |
| 56 | endf __kernel_sync_dicache |
| 57 | |
| 58 | .cfi_endproc |
| 59 | |
| 60 | /* |
| 61 | * TODO: __kernel_get_tbfreq |
| 62 | * This is probably a constant for QEMU. |
| 63 | */ |
| 64 | |
| 65 | /* |
| 66 | * Start the unwind info at least one instruction before the signal |
| 67 | * trampoline, because the unwinder will assume we are returning |
| 68 | * after a call site. |
| 69 | */ |
| 70 | |
| 71 | .cfi_startproc simple |
| 72 | .cfi_signal_frame |
| 73 | |
| 74 | #ifdef _ARCH_PPC64 |
| 75 | # define __kernel_sigtramp_rt __kernel_sigtramp_rt64 |
| 76 | # define sizeof_reg 8 |
| 77 | #else |
| 78 | # define __kernel_sigtramp_rt __kernel_sigtramp_rt32 |
| 79 | # define sizeof_reg 4 |
| 80 | #endif |
| 81 | #define sizeof_freg 8 |
| 82 | #define sizeof_vreg 16 |
| 83 | |
| 84 | .cfi_def_cfa 1, SIGNAL_FRAMESIZE + offsetof_rt_sigframe_mcontext |
| 85 | |
| 86 | /* Return address */ |
| 87 | .cfi_return_column 67 |
| 88 | .cfi_offset 67, 32 * sizeof_reg /* nip */ |
| 89 | |
| 90 | /* Integer registers */ |
| 91 | .cfi_offset 0, 0 * sizeof_reg |
| 92 | .cfi_offset 1, 1 * sizeof_reg |
| 93 | .cfi_offset 2, 2 * sizeof_reg |
| 94 | .cfi_offset 3, 3 * sizeof_reg |
| 95 | .cfi_offset 4, 4 * sizeof_reg |
| 96 | .cfi_offset 5, 5 * sizeof_reg |
| 97 | .cfi_offset 6, 6 * sizeof_reg |
| 98 | .cfi_offset 7, 7 * sizeof_reg |
| 99 | .cfi_offset 8, 8 * sizeof_reg |
| 100 | .cfi_offset 9, 9 * sizeof_reg |
| 101 | .cfi_offset 10, 10 * sizeof_reg |
| 102 | .cfi_offset 11, 11 * sizeof_reg |
| 103 | .cfi_offset 12, 12 * sizeof_reg |
| 104 | .cfi_offset 13, 13 * sizeof_reg |
| 105 | .cfi_offset 14, 14 * sizeof_reg |
| 106 | .cfi_offset 15, 15 * sizeof_reg |
| 107 | .cfi_offset 16, 16 * sizeof_reg |
| 108 | .cfi_offset 17, 17 * sizeof_reg |
| 109 | .cfi_offset 18, 18 * sizeof_reg |
| 110 | .cfi_offset 19, 19 * sizeof_reg |
| 111 | .cfi_offset 20, 20 * sizeof_reg |
| 112 | .cfi_offset 21, 21 * sizeof_reg |
| 113 | .cfi_offset 22, 22 * sizeof_reg |
| 114 | .cfi_offset 23, 23 * sizeof_reg |
| 115 | .cfi_offset 24, 24 * sizeof_reg |
| 116 | .cfi_offset 25, 25 * sizeof_reg |
| 117 | .cfi_offset 26, 26 * sizeof_reg |
| 118 | .cfi_offset 27, 27 * sizeof_reg |
| 119 | .cfi_offset 28, 28 * sizeof_reg |
| 120 | .cfi_offset 29, 29 * sizeof_reg |
| 121 | .cfi_offset 30, 30 * sizeof_reg |
| 122 | .cfi_offset 31, 31 * sizeof_reg |
| 123 | .cfi_offset 65, 36 * sizeof_reg /* lr */ |
| 124 | .cfi_offset 70, 38 * sizeof_reg /* ccr */ |
| 125 | |
| 126 | /* Floating point registers */ |
| 127 | .cfi_offset 32, offsetof_mcontext_fregs |
| 128 | .cfi_offset 33, offsetof_mcontext_fregs + 1 * sizeof_freg |
| 129 | .cfi_offset 34, offsetof_mcontext_fregs + 2 * sizeof_freg |
| 130 | .cfi_offset 35, offsetof_mcontext_fregs + 3 * sizeof_freg |
| 131 | .cfi_offset 36, offsetof_mcontext_fregs + 4 * sizeof_freg |
| 132 | .cfi_offset 37, offsetof_mcontext_fregs + 5 * sizeof_freg |
| 133 | .cfi_offset 38, offsetof_mcontext_fregs + 6 * sizeof_freg |
| 134 | .cfi_offset 39, offsetof_mcontext_fregs + 7 * sizeof_freg |
| 135 | .cfi_offset 40, offsetof_mcontext_fregs + 8 * sizeof_freg |
| 136 | .cfi_offset 41, offsetof_mcontext_fregs + 9 * sizeof_freg |
| 137 | .cfi_offset 42, offsetof_mcontext_fregs + 10 * sizeof_freg |
| 138 | .cfi_offset 43, offsetof_mcontext_fregs + 11 * sizeof_freg |
| 139 | .cfi_offset 44, offsetof_mcontext_fregs + 12 * sizeof_freg |
| 140 | .cfi_offset 45, offsetof_mcontext_fregs + 13 * sizeof_freg |
| 141 | .cfi_offset 46, offsetof_mcontext_fregs + 14 * sizeof_freg |
| 142 | .cfi_offset 47, offsetof_mcontext_fregs + 15 * sizeof_freg |
| 143 | .cfi_offset 48, offsetof_mcontext_fregs + 16 * sizeof_freg |
| 144 | .cfi_offset 49, offsetof_mcontext_fregs + 17 * sizeof_freg |
| 145 | .cfi_offset 50, offsetof_mcontext_fregs + 18 * sizeof_freg |
| 146 | .cfi_offset 51, offsetof_mcontext_fregs + 19 * sizeof_freg |
| 147 | .cfi_offset 52, offsetof_mcontext_fregs + 20 * sizeof_freg |
| 148 | .cfi_offset 53, offsetof_mcontext_fregs + 21 * sizeof_freg |
| 149 | .cfi_offset 54, offsetof_mcontext_fregs + 22 * sizeof_freg |
| 150 | .cfi_offset 55, offsetof_mcontext_fregs + 23 * sizeof_freg |
| 151 | .cfi_offset 56, offsetof_mcontext_fregs + 24 * sizeof_freg |
| 152 | .cfi_offset 57, offsetof_mcontext_fregs + 25 * sizeof_freg |
| 153 | .cfi_offset 58, offsetof_mcontext_fregs + 26 * sizeof_freg |
| 154 | .cfi_offset 59, offsetof_mcontext_fregs + 27 * sizeof_freg |
| 155 | .cfi_offset 60, offsetof_mcontext_fregs + 28 * sizeof_freg |
| 156 | .cfi_offset 61, offsetof_mcontext_fregs + 29 * sizeof_freg |
| 157 | .cfi_offset 62, offsetof_mcontext_fregs + 30 * sizeof_freg |
| 158 | .cfi_offset 63, offsetof_mcontext_fregs + 31 * sizeof_freg |
| 159 | |
| 160 | /* |
| 161 | * Unlike the kernel, unconditionally represent the Altivec/VSX regs. |
| 162 | * The space within the stack frame is always available, and most of |
| 163 | * our supported processors have them enabled. The only complication |
| 164 | * for PPC64 is the misalignment, so that we have to use indirection. |
| 165 | */ |
| 166 | .macro save_vreg_ofs reg, ofs |
| 167 | #ifdef _ARCH_PPC64 |
| 168 | /* |
| 169 | * vreg = *(cfa + offsetof(v_regs)) + ofs |
| 170 | * |
| 171 | * The CFA is input to the expression on the stack, so: |
| 172 | * DW_CFA_expression reg, length (7), |
| 173 | * DW_OP_plus_uconst (0x23), vreg_ptr, DW_OP_deref (0x06), |
| 174 | * DW_OP_plus_uconst (0x23), ofs |
| 175 | */ |
| 176 | .cfi_escape 0x10, 77 + \reg, 7, 0x23, (offsetof_mcontext_vregs_ptr & 0x7f) + 0x80, offsetof_mcontext_vregs_ptr >> 7, 0x06, 0x23, (\ofs & 0x7f) | 0x80, \ofs >> 7 |
| 177 | #else |
| 178 | .cfi_offset 77 + \reg, offsetof_mcontext_vregs + \ofs |
| 179 | #endif |
| 180 | .endm |
| 181 | |
| 182 | .macro save_vreg reg |
| 183 | save_vreg_ofs \reg, (\reg * sizeof_vreg) |
| 184 | .endm |
| 185 | |
| 186 | save_vreg 0 |
| 187 | save_vreg 1 |
| 188 | save_vreg 2 |
| 189 | save_vreg 3 |
| 190 | save_vreg 4 |
| 191 | save_vreg 5 |
| 192 | save_vreg 6 |
| 193 | save_vreg 7 |
| 194 | save_vreg 8 |
| 195 | save_vreg 9 |
| 196 | save_vreg 10 |
| 197 | save_vreg 11 |
| 198 | save_vreg 12 |
| 199 | save_vreg 13 |
| 200 | save_vreg 14 |
| 201 | save_vreg 15 |
| 202 | save_vreg 16 |
| 203 | save_vreg 17 |
| 204 | save_vreg 18 |
| 205 | save_vreg 19 |
| 206 | save_vreg 20 |
| 207 | save_vreg 21 |
| 208 | save_vreg 22 |
| 209 | save_vreg 23 |
| 210 | save_vreg 24 |
| 211 | save_vreg 25 |
| 212 | save_vreg 26 |
| 213 | save_vreg 27 |
| 214 | save_vreg 28 |
| 215 | save_vreg 29 |
| 216 | save_vreg 30 |
| 217 | save_vreg 31 |
| 218 | save_vreg 32 |
| 219 | save_vreg_ofs 33, (32 * sizeof_vreg + 12) |
| 220 | |
| 221 | nop |
| 222 | |
| 223 | sigreturn_region_start: |
| 224 | __kernel_sigtramp_rt: |
| 225 | raw_syscall __NR_rt_sigreturn |
| 226 | endf __kernel_sigtramp_rt |
| 227 | |
| 228 | #ifndef _ARCH_PPC64 |
| 229 | /* |
| 230 | * The non-rt sigreturn has the same layout at a different offset. |
| 231 | * Move the CFA and leave all the other descriptions the same. |
| 232 | */ |
| 233 | .cfi_def_cfa 1, SIGNAL_FRAMESIZE + offsetof_sigframe_mcontext |
| 234 | nop |
| 235 | __kernel_sigtramp32: |
| 236 | raw_syscall __NR_sigreturn |
| 237 | endf __kernel_sigtramp32 |
| 238 | #endif |
| 239 | sigreturn_region_end: |
| 240 | |
| 241 | .cfi_endproc |