On Thu, 19 Sep 2002, Daniel Eischen wrote:
> On Wed, 18 Sep 2002, Julian Elischer wrote:
>
> > threads is broken right now..
> > due to a miscommunicatin,. the kernel and the threads library have
> > a disagreement regarding something..
> > Unfortunatly the person to slap up over this is offline for aday or
> > so..
> > please be patient for a day or so (we hope).
>
> I think it's because libc_r has been disconnected from the
> build:
>
> revision 1.143
> date: 2002/09/17 07:32:36; author: peter; state: Exp; lines: +1 -1
> Add i386 to the list of architectures that libc_r is broken on. This
> effectively removes pppctl from the build for now. It only compiles on
> alpha now (now ironic).
>
> And the i386 mcontext_t is now bigger because we account for the
> newer SSE (?) format FP register sets. Older libc_r's used ucontext_t's
> that were smaller and manually save and restore FP state into
> areas of ucontext_t which mc_len and mc_fpformat now occupy.
so does that code still exist?
> The kernel uses these to validate a context and returns an
> error if these fields aren't valid.
so, we need to change the kernel too right?
>
> The fix is to remove the two calls to FP_SAVE_UC and FP_RESTORE_UC
> in libc_r/uthread/uthread_kern.c. And to also hook libc_r back
> into the build (src/lib/Makefile).
If we remove the calls, is the original code still present?
or did that get removed?
>
> Libc_r patch included (which my mailer will probably mangle).
>
> --
> Dan Eischen
>
> Index: pthread_private.h
> ===================================================================
> RCS file: /opt/d/CVS/src/lib/libc_r/uthread/pthread_private.h,v
> retrieving revision 1.73
> diff -u -r1.73 pthread_private.h
> --- pthread_private.h 29 Aug 2002 23:06:06 -0000 1.73
> +++ pthread_private.h 19 Sep 2002 06:53:57 -0000
> @@ -75,16 +75,6 @@
> #define SET_STACK_JB(jb, stk) (jb)[0]._jb[2] = (int)(stk)
> #define SET_STACK_SJB(sjb, stk) (sjb)[0]._sjb[2] = (int)(stk)
> #define SET_STACK_UC(ucp, stk) (ucp)->uc_mcontext.mc_esp = (int)(stk)
> -#define FP_SAVE_UC(ucp) do { \
> - char *fdata; \
> - fdata = (char *) (ucp)->uc_mcontext.mc_fpregs; \
> - __asm__("fnsave %0": :"m"(*fdata)); \
> -} while (0)
> -#define FP_RESTORE_UC(ucp) do { \
> - char *fdata; \
> - fdata = (char *) (ucp)->uc_mcontext.mc_fpregs; \
> - __asm__("frstor %0": :"m"(*fdata)); \
> -} while (0)
> #define SET_RETURN_ADDR_JB(jb, ra) (jb)[0]._jb[0] = (int)(ra)
> #elif defined(__alpha__)
> #include <machine/reg.h>
> @@ -94,8 +84,6 @@
> #define SET_STACK_JB(jb, stk) (jb)[0]._jb[R_SP + 4] = (long)(stk)
> #define SET_STACK_SJB(sjb, stk) (sjb)[0]._sjb[R_SP + 4] = (long)(stk)
> #define SET_STACK_UC(ucp, stk) (ucp)->uc_mcontext.mc_regs[R_SP] = (unsigned
>long)(stk)
> -#define FP_SAVE_UC(ucp)
> -#define FP_RESTORE_UC(ucp)
> #define SET_RETURN_ADDR_JB(jb, ra) do { \
> (jb)[0]._jb[2] = (long)(ra); \
> (jb)[0]._jb[R_RA + 4] = (long)(ra); \
> Index: uthread_kern.c
> ===================================================================
> RCS file: /opt/d/CVS/src/lib/libc_r/uthread/uthread_kern.c,v
> retrieving revision 1.42
> diff -u -r1.42 uthread_kern.c
> --- uthread_kern.c 29 Aug 2002 00:44:11 -0000 1.42
> +++ uthread_kern.c 19 Sep 2002 06:53:55 -0000
> @@ -113,8 +113,6 @@
>
> /* Check if this function was called from the signal handler: */
> if (ucp != NULL) {
> - /* XXX - Save FP registers? */
> - FP_SAVE_UC(ucp);
> called_from_handler = 1;
> DBG_MSG("Entering scheduler due to signal\n");
> }
> @@ -156,9 +154,6 @@
> if (ucp == NULL)
> return;
> else {
> - /* XXX - Restore FP registers? */
> - FP_RESTORE_UC(ucp);
> -
> /*
> * Set the process signal mask in the context; it
> * could have changed by the handler.
>
>
>
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