qemu-e2k/target/m68k
Mark Cave-Ayland d6cbd8f7a1 target/m68k: don't set SSW ATC bit for physical bus errors
If a NuBus slot doesn't contain a card, the Quadra hardware generates a physical
bus error if the CPU attempts to access the slot address space. Both Linux and
MacOS use a separate bus error handler during NuBus accesses in order to detect
and recover when addressing empty slots.

According to the MC68040 users manual the ATC bit of the SSW is used to
distinguish between ATC faults and physical bus errors. MacOS specifically checks
the stack frame generated by a NuBus error and panics if the SSW ATC bit is set.

Update m68k_cpu_transaction_failed() so that the SSW ATC bit is not set if the
memory API returns MEMTX_DECODE_ERROR which will be used to indicate that an
access to an empty NuBus slot occurred.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20210308121155.2476-2-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
2021-03-11 21:12:32 +01:00
..
cpu-param.h
cpu-qom.h qom: Remove module_obj_name parameter from OBJECT_DECLARE* macros 2020-09-18 14:12:32 -04:00
cpu.c m68k: add MSP detection support for stack pointer swap helpers 2021-02-11 21:10:01 +01:00
cpu.h m68k: add MSP detection support for stack pointer swap helpers 2021-02-11 21:10:01 +01:00
fpu_helper.c target/m68k: Add vmstate definition for M68kCPU 2020-12-12 18:12:39 +01:00
gdbstub.c gdbstub: extend GByteArray to read register helpers 2020-03-17 17:38:38 +00:00
helper.c target/m68k: Drop use of gdb_get_float64() and ldfq_p() 2021-02-15 09:38:40 +00:00
helper.h target/m68k: implement opcode fetoxm1 2020-06-02 13:59:02 +02:00
m68k-semi.c gdbstub: drop CPUEnv from gdb_exit() 2021-01-18 10:05:06 +00:00
meson.build meson: target 2020-08-21 06:30:35 -04:00
monitor.c hmp: Pass monitor to mon_get_cpu_env() 2020-11-13 12:45:51 +00:00
op_helper.c target/m68k: don't set SSW ATC bit for physical bus errors 2021-03-11 21:12:32 +01:00
qregs.def
softfloat_fpsp_tables.h m68k comments break patch submission due to being incorrectly formatted 2019-06-26 17:14:39 +02:00
softfloat.c softfloat: merge floatx80_mod and floatx80_rem 2020-06-26 09:39:37 -04:00
softfloat.h softfloat: merge floatx80_mod and floatx80_rem 2020-06-26 09:39:37 -04:00
translate.c target/m68k: implement rtr instruction 2021-03-11 21:12:32 +01:00