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| author | Jeff Johnston <jjohnstn@redhat.com> | 2002-10-18 21:09:02 +0000 |
|---|---|---|
| committer | Jeff Johnston <jjohnstn@redhat.com> | 2002-10-18 21:09:02 +0000 |
| commit | f545964009beb43bb99b9bb937bb52a18e7f1bb6 (patch) | |
| tree | f9c0eed7e14448e89e6ca033ec6b4dba7d2660ee /libgloss/m32r | |
| parent | 2ed0e93ccc77c8440012ed146b570eb64268b495 (diff) | |
| download | cygnal-f545964009beb43bb99b9bb937bb52a18e7f1bb6.tar.gz cygnal-f545964009beb43bb99b9bb937bb52a18e7f1bb6.tar.bz2 cygnal-f545964009beb43bb99b9bb937bb52a18e7f1bb6.zip | |
2002-10-04 Michael Snyder <msnyder@redhat.com>
* m32r/m32r-lib.c (exceptionHandler): Fix computation of
exception vector address, as suggested by Mitsubishi.
(getExceptionVector): Ditto.
Diffstat (limited to 'libgloss/m32r')
| -rw-r--r-- | libgloss/m32r/m32r-lib.c | 23 |
1 files changed, 14 insertions, 9 deletions
diff --git a/libgloss/m32r/m32r-lib.c b/libgloss/m32r/m32r-lib.c index cad55f54e..1d2d29131 100644 --- a/libgloss/m32r/m32r-lib.c +++ b/libgloss/m32r/m32r-lib.c @@ -109,15 +109,22 @@ void phex(long x) mesg(buf); } -/* Setup trap TT to go to ROUTINE. */ +/* + * These routines set and get exception handlers. They look a little + * funny because the M32R uses branch instructions in its exception + * vectors, not just the addresses. The instruction format used is + * BRA pcdisp24. + */ -void +#define TRAP_VECTOR_BASE_ADDR 0x00000040 + +/* Setup trap TT to go to ROUTINE. */ +void exceptionHandler (int tt, unsigned long routine) { #ifndef REVC - unsigned long *tb = (unsigned long *) 0x40; /* Trap vector base address */ - - tb[tt] = ((routine >> 2) | 0xff000000) - tt - (0x40 >> 2); + unsigned long *tb = (unsigned long *) TRAP_VECTOR_BASE_ADDR; + tb[tt] = (0xff000000 | ((routine - (unsigned long) (&tb[tt])) >> 2)); #else unsigned long *tb = 0; /* Trap vector base address */ @@ -126,14 +133,12 @@ exceptionHandler (int tt, unsigned long routine) } /* Return the address of trap TT handler */ - unsigned long getExceptionHandler (int tt) { #ifndef REVC - unsigned long *tb = (unsigned long *) 0x40; /* Trap vector base address */ - - return ((tb[tt] + tt + (0x40 >> 2)) | 0xff000000) << 2; + unsigned long *tb = (unsigned long *) TRAP_VECTOR_BASE_ADDR; + return ((tb[tt] & ~0xff000000) << 2) + (unsigned long) (&tb[tt]); #else unsigned long *tb = 0; /* Trap vector base address */ |