examples/performance-thread/common/arch/arm64/ctx.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2017 Cavium, Inc
   3  */
   4
   5 #include <rte_common.h>
   6 #include <ctx.h>
   7
   8 void
   9 ctx_switch(struct ctx *new_ctx __rte_unused, struct ctx *curr_ctx __rte_unused)
  10 {
  11         /* SAVE CURRENT CONTEXT */
  12         asm volatile (
  13                 /* Save SP */
  14                 "mov x3, sp\n"
  15                 "str x3, [x1, #0]\n"
  16
  17                 /* Save FP and LR */
  18                 "stp x29, x30, [x1, #8]\n"
  19
  20                 /* Save Callee Saved Regs x19 - x28 */
  21                 "stp x19, x20, [x1, #24]\n"
  22                 "stp x21, x22, [x1, #40]\n"
  23                 "stp x23, x24, [x1, #56]\n"
  24                 "stp x25, x26, [x1, #72]\n"
  25                 "stp x27, x28, [x1, #88]\n"
  26
  27                 /*
  28                  * Save bottom 64-bits of Callee Saved
  29                  * SIMD Regs v8 - v15
  30                  */
  31                 "stp d8, d9, [x1, #104]\n"
  32                 "stp d10, d11, [x1, #120]\n"
  33                 "stp d12, d13, [x1, #136]\n"
  34                 "stp d14, d15, [x1, #152]\n"
  35         );
  36
  37         /* RESTORE NEW CONTEXT */
  38         asm volatile (
  39                 /* Restore SP */
  40                 "ldr x3, [x0, #0]\n"
  41                 "mov sp, x3\n"
  42
  43                 /* Restore FP and LR */
  44                 "ldp x29, x30, [x0, #8]\n"
  45
  46                 /* Restore Callee Saved Regs x19 - x28 */
  47                 "ldp x19, x20, [x0, #24]\n"
  48                 "ldp x21, x22, [x0, #40]\n"
  49                 "ldp x23, x24, [x0, #56]\n"
  50                 "ldp x25, x26, [x0, #72]\n"
  51                 "ldp x27, x28, [x0, #88]\n"
  52
  53                 /*
  54                  * Restore bottom 64-bits of Callee Saved
  55                  * SIMD Regs v8 - v15
  56                  */
  57                 "ldp d8, d9, [x0, #104]\n"
  58                 "ldp d10, d11, [x0, #120]\n"
  59                 "ldp d12, d13, [x0, #136]\n"
  60                 "ldp d14, d15, [x0, #152]\n"
  61         );
  62 }