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target/ppc: 74xx: System Call exception cleanup

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Remove the BookE code and add a comment explaining why we need to keep
hypercall support even though this CPU does not have a hypervisor
mode.

Signed-off-by: Fabiano Rosas <farosas@linux.ibm.com>
Message-Id: <20220127201116.1154733-7-farosas@linux.ibm.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
This commit is contained in:
Fabiano Rosas 2022-01-28 13:15:07 +01:00 committed by Cédric Le Goater
parent 0ea2a65fe8
commit bca2c6d9e0
1 changed files with 11 additions and 6 deletions
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17
target/ppc/excp_helper.c
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@ -556,7 +556,7 @@ static void powerpc_excp_74xx(PowerPCCPU *cpu, int excp)
CPUState *cs = CPU(cpu); CPUState *cs = CPU(cpu);
CPUPPCState *env = &cpu->env; CPUPPCState *env = &cpu->env;
target_ulong msr, new_msr, vector; target_ulong msr, new_msr, vector;
int srr0, srr1, lev = -1; int srr0, srr1;
if (excp <= POWERPC_EXCP_NONE || excp >= POWERPC_EXCP_NB) { if (excp <= POWERPC_EXCP_NONE || excp >= POWERPC_EXCP_NB) {
cpu_abort(cs, "Invalid PowerPC exception %d. Aborting\n", excp); cpu_abort(cs, "Invalid PowerPC exception %d. Aborting\n", excp);
@ -669,7 +669,8 @@ static void powerpc_excp_74xx(PowerPCCPU *cpu, int excp)
} }
break; break;
case POWERPC_EXCP_SYSCALL: /* System call exception */ case POWERPC_EXCP_SYSCALL: /* System call exception */
lev = env->error_code; {
int lev = env->error_code;
if ((lev == 1) && cpu->vhyp) { if ((lev == 1) && cpu->vhyp) {
dump_hcall(env); dump_hcall(env);
@ -683,17 +684,21 @@ static void powerpc_excp_74xx(PowerPCCPU *cpu, int excp)
*/ */
env->nip += 4; env->nip += 4;
/* "PAPR mode" built-in hypercall emulation */ /*
* The Virtual Open Firmware (VOF) relies on the 'sc 1'
* instruction to communicate with QEMU. The pegasos2 machine
* uses VOF and the 74xx CPUs, so although the 74xx don't have
* HV mode, we need to keep hypercall support.
*/
if ((lev == 1) && cpu->vhyp) { if ((lev == 1) && cpu->vhyp) {
PPCVirtualHypervisorClass *vhc = PPCVirtualHypervisorClass *vhc =
PPC_VIRTUAL_HYPERVISOR_GET_CLASS(cpu->vhyp); PPC_VIRTUAL_HYPERVISOR_GET_CLASS(cpu->vhyp);
vhc->hypercall(cpu->vhyp, cpu); vhc->hypercall(cpu->vhyp, cpu);
return; return;
} }
if (lev == 1) {
new_msr |= (target_ulong)MSR_HVB;
}
break; break;
}
case POWERPC_EXCP_FPU: /* Floating-point unavailable exception */ case POWERPC_EXCP_FPU: /* Floating-point unavailable exception */
case POWERPC_EXCP_DECR: /* Decrementer exception */ case POWERPC_EXCP_DECR: /* Decrementer exception */
break; break;