| 26,6 → 26,8 |
|---|
| # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| # |
| |
| #include <kernel/arch/context_offset.h> |
| |
| .text |
| |
| .global context_save |
| 41,16 → 43,12 |
|---|
| movl 0(%esp),%eax # the caller's return %eip |
| movl 4(%esp),%edx # address of the context variable to save context to |
| |
| 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 |
| # save registers to given structure |
| CONTEXT_SAVE_ARCH_CORE %edx %eax |
| |
| # Save TLS |
| movl %gs:0, %eax |
| movl %eax, 24(%edx) # tls -> ctx->tls |
| movl %eax, OFFSET_TLS(%edx) # tls -> ctx->tls |
| |
| xorl %eax,%eax # context_save returns 1 |
| incl %eax |
| 64,18 → 62,15 |
|---|
| # |
| context_restore: |
| movl 4(%esp),%eax # address of the context variable to restore context from |
| 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 |
| |
| # restore registers from jmp_buf |
| CONTEXT_RESTORE_ARCH_CORE %eax %edx |
| |
| movl %edx,0(%esp) # ctx->pc -> saver's return %eip |
| |
| # Set thread local storage |
| pushl %edx |
| movl 24(%eax), %edx # Set arg1 to TLS addr |
| movl OFFSET_TLS(%eax), %edx # Set arg1 to TLS addr |
| movl $1, %eax # Syscall SYS_TLS_SET |
| int $0x30 |
| popl %edx |