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Implement set_mcontext() and get_mcontext(). Just as for sendsig() and

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sigreturn(), we cheat and assume the preserved registers are still
on-chip and unmodified. This is actually the case, but more by accident
than by design. We need to use unwinding eventually or explicitly
compile the kernel in a way that the compiler steers clear from using
the preserved registers completely.
This commit is contained in:
Marcel Moolenaar 2003-05-31 21:07:08 +00:00
parent b6a42c898a
commit c01da18e22
1 changed files with 14 additions and 4 deletions
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18
sys/ia64/ia64/machdep.c
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@ -1008,17 +1008,27 @@ freebsd4_sigreturn(struct thread *td, struct freebsd4_sigreturn_args *uap)
#endif
int
get_mcontext(struct thread *td, mcontext_t *mcp, int clear_ret)
get_mcontext(struct thread *td, mcontext_t *mc, int clear_ret)
{
struct trapframe *tf;
return (ENOSYS);
tf = td->td_frame;
mc->mc_special = tf->tf_special;
save_callee_saved(&mc->mc_preserved);
save_callee_saved_fp(&mc->mc_preserved_fp);
return (0);
}
int
set_mcontext(struct thread *td, const mcontext_t *mcp)
set_mcontext(struct thread *td, const mcontext_t *mc)
{
struct trapframe *tf;
return (ENOSYS);
tf = td->td_frame;
tf->tf_special = mc->mc_special;
restore_callee_saved(&mc->mc_preserved);
restore_callee_saved_fp(&mc->mc_preserved_fp);
return (0);
}
/*