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| Rev 103 | Rev 125 | ||
|---|---|---|---|
| Line 40... | Line 40... | ||
| 40 | context_save: |
40 | context_save: |
| 41 | push %ebx |
41 | push %ebx |
| 42 | 42 | ||
| 43 | movl 4(%esp),%eax # the caller's return %eip |
43 | movl 4(%esp),%eax # the caller's return %eip |
| 44 | movl 8(%esp),%ebx # address of the kernel_context variable to save context to |
44 | movl 8(%esp),%ebx # address of the kernel_context variable to save context to |
| 45 | movl %eax,4(%ebx) # %eip -> ctx->pc |
45 | movl %eax,4(%ebx) # %eip -> ctx->pc |
| 46 | movl %esp,(%ebx) # %esp -> ctx->sp |
46 | movl %esp,(%ebx) # %esp -> ctx->sp |
| 47 | 47 | ||
| 48 | movl %ebx,%eax |
48 | movl %ebx,%eax |
| 49 | pop %ebx |
49 | pop %ebx |
| 50 | 50 | ||
| 51 | movl %ebx,8(%eax) |
51 | movl %ebx,8(%eax) |
| 52 | movl %ecx,12(%eax) |
52 | movl %ecx,12(%eax) |
| 53 | movl %edx,16(%eax) |
53 | movl %edx,16(%eax) |
| 54 | movl %esi,20(%eax) |
54 | movl %esi,20(%eax) |
| 55 | movl %edi,24(%eax) |
55 | movl %edi,24(%eax) |
| 56 | movl %ebp,28(%eax) |
56 | movl %ebp,28(%eax) |
| 57 | 57 | ||
| 58 | xorl %eax,%eax # context_save returns 1 |
58 | xorl %eax,%eax # context_save returns 1 |
| 59 | incl %eax |
59 | incl %eax |
| 60 | ret |
60 | ret |
| 61 | 61 | ||
| 62 | 62 | ||
| 63 | ## Restore current CPU context |
63 | ## Restore current CPU context |
| 64 | # |
64 | # |
| 65 | # Restore CPU context from the kernel_context variable |
65 | # Restore CPU context from the kernel_context variable |
| 66 | # pointed by the 1st argument. Returns 0 in EAX. |
66 | # pointed by the 1st argument. Returns 0 in EAX. |
| 67 | # |
67 | # |
| 68 | context_restore: |
68 | context_restore: |
| 69 | movl 4(%esp),%eax # address of the kernel_context variable to restore context from |
69 | movl 4(%esp),%eax # address of the kernel_context variable to restore context from |
| 70 | movl (%eax),%esp # ctx->sp -> %esp |
70 | movl (%eax),%esp # ctx->sp -> %esp |
| 71 | addl $4,%esp # this is for the pop we don't do |
71 | addl $4,%esp # this is for the pop we don't do |
| 72 | 72 | ||
| Line 77... | Line 77... | ||
| 77 | movl 24(%eax),%edi |
77 | movl 24(%eax),%edi |
| 78 | movl 28(%eax),%ebp |
78 | movl 28(%eax),%ebp |
| 79 | 79 | ||
| 80 | movl 4(%eax),%eax |
80 | movl 4(%eax),%eax |
| 81 | movl %eax,(%esp) # ctx->pc -> saver's return %eip |
81 | movl %eax,(%esp) # ctx->pc -> saver's return %eip |
| 82 | xorl %eax,%eax # context_restore returns 0 |
82 | xorl %eax,%eax # context_restore returns 0 |
| 83 | ret |
83 | ret |