| /* |
| * RISC-V linux replacement vdso. |
| * |
| * Copyright 2021 Linaro, Ltd. |
| * |
| * SPDX-License-Identifier: GPL-2.0-or-later |
| */ |
| |
| #include <asm/unistd.h> |
| #include <asm/errno.h> |
| |
| #if __riscv_xlen == 32 |
| # define TARGET_ABI32 |
| #endif |
| #include "vdso-asmoffset.h" |
| |
| .text |
| |
| .macro endf name |
| .globl \name |
| .type \name, @function |
| .size \name, . - \name |
| .endm |
| |
| .macro raw_syscall nr |
| li a7, \nr |
| ecall |
| .endm |
| |
| .macro vdso_syscall name, nr |
| \name: |
| raw_syscall \nr |
| ret |
| endf \name |
| .endm |
| |
| __vdso_gettimeofday: |
| .cfi_startproc |
| #ifdef __NR_gettimeofday |
| raw_syscall __NR_gettimeofday |
| ret |
| #else |
| /* No gettimeofday, fall back to clock_gettime64. */ |
| beq a1, zero, 1f |
| sw zero, 0(a1) /* tz->tz_minuteswest = 0 */ |
| sw zero, 4(a1) /* tz->tz_dsttime = 0 */ |
| 1: addi sp, sp, -32 |
| .cfi_adjust_cfa_offset 32 |
| sw a0, 16(sp) /* save tv */ |
| mv a0, sp |
| raw_syscall __NR_clock_gettime64 |
| lw t0, 0(sp) /* timespec.tv_sec.low */ |
| lw t1, 4(sp) /* timespec.tv_sec.high */ |
| lw t2, 8(sp) /* timespec.tv_nsec.low */ |
| lw a1, 16(sp) /* restore tv */ |
| addi sp, sp, 32 |
| .cfi_adjust_cfa_offset -32 |
| bne a0, zero, 9f /* syscall error? */ |
| li a0, -EOVERFLOW |
| bne t1, zero, 9f /* y2038? */ |
| li a0, 0 |
| li t3, 1000 |
| divu t2, t2, t3 /* nsec -> usec */ |
| sw t0, 0(a1) /* tz->tv_sec */ |
| sw t2, 4(a1) /* tz->tv_usec */ |
| 9: ret |
| #endif |
| .cfi_endproc |
| endf __vdso_gettimeofday |
| |
| .cfi_startproc |
| |
| #ifdef __NR_clock_gettime |
| vdso_syscall __vdso_clock_gettime, __NR_clock_gettime |
| #else |
| vdso_syscall __vdso_clock_gettime, __NR_clock_gettime64 |
| #endif |
| |
| #ifdef __NR_clock_getres |
| vdso_syscall __vdso_clock_getres, __NR_clock_getres |
| #else |
| vdso_syscall __vdso_clock_getres, __NR_clock_getres_time64 |
| #endif |
| |
| vdso_syscall __vdso_getcpu, __NR_getcpu |
| |
| __vdso_flush_icache: |
| /* qemu does not need to flush the icache */ |
| li a0, 0 |
| ret |
| endf __vdso_flush_icache |
| |
| .cfi_endproc |
| |
| /* |
| * Start the unwind info at least one instruction before the signal |
| * trampoline, because the unwinder will assume we are returning |
| * after a call site. |
| */ |
| |
| .cfi_startproc simple |
| .cfi_signal_frame |
| |
| #define sizeof_reg (__riscv_xlen / 4) |
| #define sizeof_freg 8 |
| #define B_GR (offsetof_uc_mcontext - sizeof_rt_sigframe) |
| #define B_FR (offsetof_uc_mcontext - sizeof_rt_sigframe + offsetof_freg0) |
| |
| .cfi_def_cfa 2, sizeof_rt_sigframe |
| |
| /* Return address */ |
| .cfi_return_column 64 |
| .cfi_offset 64, B_GR + 0 /* pc */ |
| |
| /* Integer registers */ |
| .cfi_offset 1, B_GR + 1 * sizeof_reg /* r1 (ra) */ |
| .cfi_offset 2, B_GR + 2 * sizeof_reg /* r2 (sp) */ |
| .cfi_offset 3, B_GR + 3 * sizeof_reg |
| .cfi_offset 4, B_GR + 4 * sizeof_reg |
| .cfi_offset 5, B_GR + 5 * sizeof_reg |
| .cfi_offset 6, B_GR + 6 * sizeof_reg |
| .cfi_offset 7, B_GR + 7 * sizeof_reg |
| .cfi_offset 8, B_GR + 8 * sizeof_reg |
| .cfi_offset 9, B_GR + 9 * sizeof_reg |
| .cfi_offset 10, B_GR + 10 * sizeof_reg |
| .cfi_offset 11, B_GR + 11 * sizeof_reg |
| .cfi_offset 12, B_GR + 12 * sizeof_reg |
| .cfi_offset 13, B_GR + 13 * sizeof_reg |
| .cfi_offset 14, B_GR + 14 * sizeof_reg |
| .cfi_offset 15, B_GR + 15 * sizeof_reg |
| .cfi_offset 16, B_GR + 16 * sizeof_reg |
| .cfi_offset 17, B_GR + 17 * sizeof_reg |
| .cfi_offset 18, B_GR + 18 * sizeof_reg |
| .cfi_offset 19, B_GR + 19 * sizeof_reg |
| .cfi_offset 20, B_GR + 20 * sizeof_reg |
| .cfi_offset 21, B_GR + 21 * sizeof_reg |
| .cfi_offset 22, B_GR + 22 * sizeof_reg |
| .cfi_offset 23, B_GR + 23 * sizeof_reg |
| .cfi_offset 24, B_GR + 24 * sizeof_reg |
| .cfi_offset 25, B_GR + 25 * sizeof_reg |
| .cfi_offset 26, B_GR + 26 * sizeof_reg |
| .cfi_offset 27, B_GR + 27 * sizeof_reg |
| .cfi_offset 28, B_GR + 28 * sizeof_reg |
| .cfi_offset 29, B_GR + 29 * sizeof_reg |
| .cfi_offset 30, B_GR + 30 * sizeof_reg |
| .cfi_offset 31, B_GR + 31 * sizeof_reg /* r31 */ |
| |
| .cfi_offset 32, B_FR + 0 /* f0 */ |
| .cfi_offset 33, B_FR + 1 * sizeof_freg /* f1 */ |
| .cfi_offset 34, B_FR + 2 * sizeof_freg |
| .cfi_offset 35, B_FR + 3 * sizeof_freg |
| .cfi_offset 36, B_FR + 4 * sizeof_freg |
| .cfi_offset 37, B_FR + 5 * sizeof_freg |
| .cfi_offset 38, B_FR + 6 * sizeof_freg |
| .cfi_offset 39, B_FR + 7 * sizeof_freg |
| .cfi_offset 40, B_FR + 8 * sizeof_freg |
| .cfi_offset 41, B_FR + 9 * sizeof_freg |
| .cfi_offset 42, B_FR + 10 * sizeof_freg |
| .cfi_offset 43, B_FR + 11 * sizeof_freg |
| .cfi_offset 44, B_FR + 12 * sizeof_freg |
| .cfi_offset 45, B_FR + 13 * sizeof_freg |
| .cfi_offset 46, B_FR + 14 * sizeof_freg |
| .cfi_offset 47, B_FR + 15 * sizeof_freg |
| .cfi_offset 48, B_FR + 16 * sizeof_freg |
| .cfi_offset 49, B_FR + 17 * sizeof_freg |
| .cfi_offset 50, B_FR + 18 * sizeof_freg |
| .cfi_offset 51, B_FR + 19 * sizeof_freg |
| .cfi_offset 52, B_FR + 20 * sizeof_freg |
| .cfi_offset 53, B_FR + 21 * sizeof_freg |
| .cfi_offset 54, B_FR + 22 * sizeof_freg |
| .cfi_offset 55, B_FR + 23 * sizeof_freg |
| .cfi_offset 56, B_FR + 24 * sizeof_freg |
| .cfi_offset 57, B_FR + 25 * sizeof_freg |
| .cfi_offset 58, B_FR + 26 * sizeof_freg |
| .cfi_offset 59, B_FR + 27 * sizeof_freg |
| .cfi_offset 60, B_FR + 28 * sizeof_freg |
| .cfi_offset 61, B_FR + 29 * sizeof_freg |
| .cfi_offset 62, B_FR + 30 * sizeof_freg |
| .cfi_offset 63, B_FR + 31 * sizeof_freg /* f31 */ |
| |
| nop |
| |
| __vdso_rt_sigreturn: |
| raw_syscall __NR_rt_sigreturn |
| endf __vdso_rt_sigreturn |
| |
| .cfi_endproc |
