| .globl _tas | |
| _tas: | |
| movl $0xCAFEBABE, %eax | |
| movl 4(%esp), %ecx | |
| xchgl %eax, 0(%ecx) | |
| ret | |
| .globl setmcontext | |
| setmcontext: | |
| movl 4(%esp), %edx | |
| movl 8(%edx), %fs | |
| movl 12(%edx), %es | |
| movl 16(%edx), %ds | |
| movl 76(%edx), %ss | |
| movl 20(%edx), %edi | |
| movl 24(%edx), %esi | |
| movl 28(%edx), %ebp | |
| movl %esp, %ecx | |
| movl 72(%edx), %esp | |
| pushl 60(%edx) /* eip */ | |
| pushl 44(%edx) /* ecx */ | |
| pushl 48(%edx) /* eax */ | |
| movl 36(%edx), %ebx | |
| movl 40(%edx), %edx | |
| movl 12(%ecx), %eax | |
| popl %eax | |
| popl %ecx | |
| ret | |
| .globl getmcontext | |
| getmcontext: | |
| pushl %edx | |
| movl 8(%esp), %edx | |
| movl %fs, 8(%edx) | |
| movl %es, 12(%edx) | |
| movl %ds, 16(%edx) | |
| movl %ss, 76(%edx) | |
| movl %edi, 20(%edx) | |
| movl %esi, 24(%edx) | |
| movl %ebp, 28(%edx) | |
| movl %ebx, 36(%edx) | |
| movl $1, 48(%edx) | |
| popl %eax | |
| movl %eax, 40(%edx) | |
| movl %ecx, 44(%edx) | |
| movl (%esp), %eax /* eip */ | |
| movl %eax, 60(%edx) | |
| movl %esp, %eax | |
| addl $4, %eax /* setmcontext will re-push the eip */ | |
| movl %eax, 72(%edx) | |
| movl 40(%edx), %edx | |
| xorl %eax, %eax | |
| ret | |