| 38,23 → 38,16 |
|---|
| # pointed by the 1st argument. Returns 1 in EAX. |
| # |
| context_save: |
| push %ebx |
| movl 0(%esp),%eax # the caller's return %eip |
| movl 4(%esp),%edx # address of the kernel_context variable to save context to |
| |
| movl 4(%esp),%eax # the caller's return %eip |
| movl 8(%esp),%ebx # address of the kernel_context variable to save context to |
| movl %eax,4(%ebx) # %eip -> ctx->pc |
| movl %esp,(%ebx) # %esp -> ctx->sp |
| movl %esp,0(%edx) # %esp -> ctx->sp |
| movl %eax,4(%edx) # %eip -> ctx->pc |
| movl %ebx,8(%edx) # %ebx -> ctx->ebx |
| movl %esi,12(%edx) # %esi -> ctx->esi |
| movl %edi,16(%edx) # %edi -> ctx->edi |
| movl %ebp,20(%edx) # %ebp -> ctx->ebp |
| |
| movl %ebx,%eax |
| pop %ebx |
| |
| movl %ebx,8(%eax) |
| movl %ecx,12(%eax) |
| movl %edx,16(%eax) |
| movl %esi,20(%eax) |
| movl %edi,24(%eax) |
| movl %ebp,28(%eax) |
| |
| xorl %eax,%eax # context_save returns 1 |
| incl %eax |
| ret |
| 67,17 → 60,13 |
|---|
| # |
| context_restore: |
| movl 4(%esp),%eax # address of the kernel_context variable to restore context from |
| movl (%eax),%esp # ctx->sp -> %esp |
| addl $4,%esp # this is for the pop we don't do |
| movl 0(%eax),%esp # ctx->sp -> %esp |
| movl 4(%eax),%edx # ctx->pc -> %edx |
| movl 8(%eax),%ebx # ctx->ebx -> %ebx |
| movl 12(%eax),%esi # ctx->esi -> %esi |
| movl 16(%eax),%edi # ctx->edi -> %edi |
| movl 20(%eax),%ebp # ctx->ebp -> %ebp |
| |
| movl 8(%eax),%ebx |
| movl 12(%eax),%ecx |
| movl 16(%eax),%edx |
| movl 20(%eax),%esi |
| movl 24(%eax),%edi |
| movl 28(%eax),%ebp |
| |
| movl 4(%eax),%eax |
| movl %eax,(%esp) # ctx->pc -> saver's return %eip |
| movl %edx,0(%esp) # ctx->pc -> saver's return %eip |
| xorl %eax,%eax # context_restore returns 0 |
| ret |