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Sync with i386 - set rbp reg to 0 for upcalls as a frame marker, not that

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it is guaranteed to be used in userland though.
This commit is contained in:
Peter Wemm 2004-08-16 22:57:13 +00:00
parent 717209c708
commit b93b95f67f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=133902
1 changed files with 1 additions and 0 deletions
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sys/amd64/amd64/vm_machdep.c
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@ -314,6 +314,7 @@ cpu_set_upcall_kse(struct thread *td, struct kse_upcall *ku)
* Set the trap frame to point at the beginning of the uts
* function.
*/
td->td_frame->tf_rbp = 0;
td->td_frame->tf_rsp =
((register_t)ku->ku_stack.ss_sp + ku->ku_stack.ss_size) & ~0x0f;
td->td_frame->tf_rsp -= 8;