diff options
Diffstat (limited to 'swtch.S')
| -rw-r--r-- | swtch.S | 59 |
1 files changed, 33 insertions, 26 deletions
@@ -1,35 +1,42 @@ # Context switch # -# void swtch(struct context **old, struct context *new); +# void swtch(struct context *old, struct context *new); # -# Save the current registers on the stack, creating -# a struct context, and save its address in *old. -# Switch stacks to new and pop previously-saved registers. +# Save current registers in old. Load from new. + .globl swtch swtch: - # Save old callee-saved registers - push %rbp - push %rbx - push %r11 - push %r12 - push %r13 - push %r14 - push %r15 - - # Switch stacks - mov %rsp, (%rdi) # first arg of swtch is in rdi - mov %rsi, %rsp # second arg of swtch is in rsi - - # Load new callee-saved registers - pop %r15 - pop %r14 - pop %r13 - pop %r12 - pop %r11 - pop %rbx - pop %rbp + sd ra, 0(a0) + sd sp, 8(a0) + sd s0, 16(a0) + sd s1, 24(a0) + sd s2, 32(a0) + sd s3, 40(a0) + sd s4, 48(a0) + sd s5, 56(a0) + sd s6, 64(a0) + sd s7, 72(a0) + sd s8, 80(a0) + sd s9, 88(a0) + sd s10, 96(a0) + sd s11, 104(a0) - ret + ld ra, 0(a1) + ld sp, 8(a1) + ld s0, 16(a1) + ld s1, 24(a1) + ld s2, 32(a1) + ld s3, 40(a1) + ld s4, 48(a1) + ld s5, 56(a1) + ld s6, 64(a1) + ld s7, 72(a1) + ld s8, 80(a1) + ld s9, 88(a1) + ld s10, 96(a1) + ld s11, 104(a1) + + ret |