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target/m68k: use EXCP_ILLEGAL instead of EXCP_UNSUPPORTED

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Coldfire defines an "Unsupported instruction" exception if execution
of a valid instruction is attempted but the required hardware is not
present in the processor.

We use it with instructions that are in fact undefined or illegal,
and the exception expected in this case by the kernel is the
illegal exception, so this patch fixes that.

Backports commit b9f8e55bf7e994e192ab7360830731580384b813 from qemu
This commit is contained in:
Laurent Vivier 2018-11-11 08:30:49 -05:00 committed by Lioncash
parent 800c9db9c9
commit 26d8891d1b
No known key found for this signature in database
GPG key ID: 4E3C3CC1031BA9C7
2 changed files with 4 additions and 5 deletions
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1
qemu/target/m68k/cpu.h
View file

@ -71,7 +71,6 @@
#define EXCP_MMU_CONF 56 /* MMU Configuration Error */
#define EXCP_MMU_ILLEGAL 57 /* MMU Illegal Operation Error */
#define EXCP_MMU_ACCESS 58 /* MMU Access Level Violation Error */
#define EXCP_UNSUPPORTED 61
#define EXCP_RTE 0x100
#define EXCP_HALT_INSN 0x101

8
qemu/target/m68k/translate.c
View file

@ -1592,7 +1592,7 @@ DISAS_INSN(undef)
but actually illegal for CPU32 or pre-68020. */
qemu_log_mask(LOG_UNIMP, "Illegal instruction: %04x @ %08x\n",
insn, s->base.pc_next);
gen_exception(s, s->base.pc_next, EXCP_UNSUPPORTED);
gen_exception(s, s->base.pc_next, EXCP_ILLEGAL);
}
DISAS_INSN(mulw)
@ -2891,7 +2891,7 @@ DISAS_INSN(mull)
if (ext & 0x400) {
if (!m68k_feature(s->env, M68K_FEATURE_QUAD_MULDIV)) {
gen_exception(s, s->base.pc_next, EXCP_UNSUPPORTED);
gen_exception(s, s->base.pc_next, EXCP_ILLEGAL);
return;
}
@ -4690,7 +4690,7 @@ DISAS_INSN(strldsr)
addr = s->pc - 2;
ext = read_im16(env, s);
if (ext != 0x46FC) {
gen_exception(s, addr, EXCP_UNSUPPORTED);
gen_exception(s, addr, EXCP_ILLEGAL);
return;
}
ext = read_im16(env, s);
@ -4978,7 +4978,7 @@ DISAS_INSN(wdebug)
}
/* TODO: Implement wdebug. */
qemu_log("WDEBUG not implemented\n");
gen_exception(s, s->pc - 2, EXCP_UNSUPPORTED);
gen_exception(s, s->pc - 2, EXCP_ILLEGAL);
}
#endif