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target/ppc: 7xx: 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: <20220204173430.1457358-8-farosas@linux.ibm.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
This commit is contained in:
Fabiano Rosas 2022-02-09 09:08:56 +01:00 committed by Cédric Le Goater
parent ab36939033
commit 3b57863593
1 changed files with 13 additions and 8 deletions
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21
target/ppc/excp_helper.c
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@ -747,7 +747,7 @@ static void powerpc_excp_7xx(PowerPCCPU *cpu, int excp)
CPUPPCState *env = &cpu->env;
int excp_model = env->excp_model;
target_ulong msr, new_msr, vector;
int srr0, srr1, lev = -1;
int srr0, srr1;
if (excp <= POWERPC_EXCP_NONE || excp >= POWERPC_EXCP_NB) {
cpu_abort(cs, "Invalid PowerPC exception %d. Aborting\n", excp);
@ -860,9 +860,10 @@ static void powerpc_excp_7xx(PowerPCCPU *cpu, int excp)
}
break;
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);
} else {
dump_syscall(env);
@ -874,17 +875,21 @@ static void powerpc_excp_7xx(PowerPCCPU *cpu, int excp)
*/
env->nip += 4;
/* "PAPR mode" built-in hypercall emulation */
if ((lev == 1) && cpu->vhyp) {
/*
* The Virtual Open Firmware (VOF) relies on the 'sc 1'
* instruction to communicate with QEMU. The pegasos2 machine
* uses VOF and the 7xx CPUs, so although the 7xx don't have
* HV mode, we need to keep hypercall support.
*/
if (lev == 1 && cpu->vhyp) {
PPCVirtualHypervisorClass *vhc =
PPC_VIRTUAL_HYPERVISOR_GET_CLASS(cpu->vhyp);
vhc->hypercall(cpu->vhyp, cpu);
return;
}
if (lev == 1) {
new_msr |= (target_ulong)MSR_HVB;
}
break;
}
case POWERPC_EXCP_FPU: /* Floating-point unavailable exception */
case POWERPC_EXCP_DECR: /* Decrementer exception */
break;