root/kernel/swtch.S

   1 # Context switch
   2 #
   3 #   void swtch(struct context *old, struct context *new);
   4 # 
   5 # Save current registers in old. Load from new. 
   6 
   7 
   8 .globl swtch
   9 swtch:
  10         sd ra, 0(a0)
  11         sd sp, 8(a0)
  12         sd s0, 16(a0)
  13         sd s1, 24(a0)
  14         sd s2, 32(a0)
  15         sd s3, 40(a0)
  16         sd s4, 48(a0)
  17         sd s5, 56(a0)
  18         sd s6, 64(a0)
  19         sd s7, 72(a0)
  20         sd s8, 80(a0)
  21         sd s9, 88(a0)
  22         sd s10, 96(a0)
  23         sd s11, 104(a0)
  24 
  25         ld ra, 0(a1)
  26         ld sp, 8(a1)
  27         ld s0, 16(a1)
  28         ld s1, 24(a1)
  29         ld s2, 32(a1)
  30         ld s3, 40(a1)
  31         ld s4, 48(a1)
  32         ld s5, 56(a1)
  33         ld s6, 64(a1)
  34         ld s7, 72(a1)
  35         ld s8, 80(a1)
  36         ld s9, 88(a1)
  37         ld s10, 96(a1)
  38         ld s11, 104(a1)
  39         
  40         ret
  41 
  42