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Patch from Eric Norum <eric@skatter.USask.Ca>:

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I found that my 68040/68360 test programs would not run even after
    I fixed the `wrong BSP' problem.

    It seems that there's a bug in the interrupt handling code for
    processors with hardware interrupt stacks (e.g. 68040).  The wrong
    status register was getting pushed on the stack for the `return
    from exception' to call _ISR__Dispatch.   This ended up making
    the context switch code run on the interrupt stack, so interrupt-driven
    context switches would always fail.

    I guess that no one has tried running any of the RTEMS-4.0 snapshots
    on a 68040 machine!

    Anyhow, here are the patches for
        1) gen68360.cfg   ---   to fix the `wrong-BSP' problem.
        2) m68k/cpu_asm.s ---   to fix the hardware interrupt stack problem.

    With these patches in place, the network demo programs run on my
    68040/68360 system.  The paranoia program runs with no failures,
    defects nor flaws.
This commit is contained in:
Joel Sherrill
1998-09-30 13:02:30 +00:00
parent 982ed3f825
commit 17408b901b
3 changed files with 1 additions and 25 deletions
Download Patch File Download Diff File Expand all files Collapse all files
c/src/exec/score/cpu/m68k/cpu_asm.s
+1 -1
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@@ -238,7 +238,7 @@ bframe: clrl SYM (_ISR_Signals_to_thread_executing)
movec msp,a0 | a0 = master stack pointer
movew #0,a0@- | push format word
movel #SYM(_ISR_Dispatch),a0@- | push return addr
movew sr,a0@- | push existing sr
movew a0@(6),a0@- | push saved sr
movec a0,msp | set master stack pointer
#else
jsr SYM (_Thread_Dispatch) | Perform context switch
c/src/exec/score/cpu/m68k/m68k.h
-17
View File
@@ -148,23 +148,6 @@ extern "C" {
# define M68K_HAS_FPSP_PACKAGE 0
# endif
#elif defined(__mc68060__)
#define CPU_MODEL_NAME "m68060"
#define M68K_HAS_VBR 1
#define M68K_HAS_SEPARATE_STACKS 0
#define M68K_HAS_BFFFO 1
#define M68K_HAS_PREINDEXING 1
#define M68K_HAS_EXTB_L 1
#define M68K_HAS_MISALIGNED 1
# if defined (__HAVE_68881__)
# define M68K_HAS_FPU 1
# define M68K_HAS_FPSP_PACKAGE 1
# else
# define M68K_HAS_FPU 0
# define M68K_HAS_FPSP_PACKAGE 0
# endif
#elif defined(__mc68302__)
#define CPU_MODEL_NAME "m68302"
#define M68K_HAS_VBR 0
make/custom/gen68360.cfg
-7
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@@ -19,13 +19,6 @@ include $(RTEMS_ROOT)/make/custom/default.cfg
# This is the actual bsp directory used during the build process.
RTEMS_BSP_FAMILY=gen68360
## Target compiler config file, if any
CONFIG.$(TARGET_ARCH).CC = $(RTEMS_ROOT)/make/compilers/gcc-target-default.cfg
# We may install in a CPU model based directory but this is still
# a gen68360 based bsp.
RTEMS_BSP=gen68360
#
# You must use versions of gcc and gas that support the -mcpu32 option.
#