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In cpu_set_upcall_kse(), create the upcall according to the entry

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path into the kernel. Normally it's due to a syscall, but one can
also be created as the result of a clock interrupt (for example).
This now even more looks like exec_setregs().

While here, add an assert that we don't expect more than 8KB of
dirty registers on the kernel stack.
This commit is contained in:
Marcel Moolenaar 2003-08-06 23:28:19 +00:00
parent 3b5e70922f
commit bee4e73025
1 changed files with 19 additions and 12 deletions
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31
sys/ia64/ia64/vm_machdep.c
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@ -156,18 +156,15 @@ cpu_set_upcall_kse(struct thread *td, struct kse_upcall *ku)
uint64_t stack;
tf = td->td_frame;
KASSERT(tf->tf_flags & FRAME_SYSCALL, ("foo"));
bzero(&tf->tf_special, sizeof(tf->tf_special));
/*
* ku->ku_func of course points to a function descriptor. Fetch the
* code address and GP value from userland.
*/
KASSERT((tf->tf_special.ndirty & ~PAGE_MASK) == 0,
("Whoa there! We have more than 8KB of dirty registers!"));
fd = ku->ku_func;
tf->tf_special.rp = fuword(&fd->func);
tf->tf_special.gp = fuword(&fd->gp);
tf->tf_special.pfs = (3UL<<62) | (1UL<<7) | 1UL;
stack = (uint64_t)ku->ku_stack.ss_sp;
tf->tf_special.bspstore = stack + 8;
bzero(&tf->tf_special, sizeof(tf->tf_special));
tf->tf_special.gp = fuword(&fd->gp);
tf->tf_special.sp = (stack + ku->ku_stack.ss_size - 16) & ~15;
tf->tf_special.rsc = 0xf;
tf->tf_special.fpsr = IA64_FPSR_DEFAULT;
@ -175,8 +172,18 @@ cpu_set_upcall_kse(struct thread *td, struct kse_upcall *ku)
IA64_PSR_DT | IA64_PSR_RT | IA64_PSR_DFH | IA64_PSR_BN |
IA64_PSR_CPL_USER;
/* XXX assumes that (bspstore & 0x1f8) < 0x1e0. */
suword((caddr_t)tf->tf_special.bspstore - 8, (uint64_t)ku->ku_mailbox);
if (tf->tf_flags & FRAME_SYSCALL) {
tf->tf_special.rp = fuword(&fd->func);
tf->tf_special.pfs = (3UL<<62) | (1UL<<7) | 1UL;
tf->tf_special.bspstore = stack + 8;
suword((caddr_t)stack, (uint64_t)ku->ku_mailbox);
} else {
tf->tf_special.iip = fuword(&fd->func);
tf->tf_special.cfm = (1UL<<63) | (1UL<<7) | 1UL;
tf->tf_special.bspstore = stack;
tf->tf_special.ndirty = 8;
*(uint64_t*)stack = (uint64_t)ku->ku_mailbox;
}
}
/*