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Re: [PATCH 8/8] target/ppc: 405: System call exception cleanup
From: |
David Gibson |
Subject: |
Re: [PATCH 8/8] target/ppc: 405: System call exception cleanup |
Date: |
Tue, 11 Jan 2022 13:31:21 +1100 |
On Mon, Jan 10, 2022 at 03:15:46PM -0300, Fabiano Rosas wrote:
> There's no sc 1.
>
> We also only used env->nip because of the vhyp code, so change to
> 'vector' now.
I don't think this is right. The point with the env->nip change is
changing the PC as it appeared *before* saving it to SRR0, so that
we'll eventually return to the right place. 'vector' is the address
for the interrupt vector itself.
>
> Signed-off-by: Fabiano Rosas <farosas@linux.ibm.com>
> ---
> target/ppc/excp_helper.c | 23 +++--------------------
> 1 file changed, 3 insertions(+), 20 deletions(-)
>
> diff --git a/target/ppc/excp_helper.c b/target/ppc/excp_helper.c
> index f7b9af5065..ab298d0d8f 100644
> --- a/target/ppc/excp_helper.c
> +++ b/target/ppc/excp_helper.c
> @@ -398,7 +398,7 @@ static void powerpc_excp_40x(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);
> @@ -518,30 +518,13 @@ static void powerpc_excp_40x(PowerPCCPU *cpu, int excp)
> }
> break;
> case POWERPC_EXCP_SYSCALL: /* System call exception
> */
> - lev = env->error_code;
> -
> - if ((lev == 1) && cpu->vhyp) {
> - dump_hcall(env);
> - } else {
> - dump_syscall(env);
> - }
> + dump_syscall(env);
>
> /*
> * We need to correct the NIP which in this case is supposed
> * to point to the next instruction
> */
> - env->nip += 4;
> -
> - /* "PAPR mode" built-in hypercall emulation */
> - 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;
> - }
> + vector += 4;
> break;
> case POWERPC_EXCP_FPU: /* Floating-point unavailable exception
> */
> case POWERPC_EXCP_APU: /* Auxiliary processor unavailable
> */
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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- Re: [PATCH 2/8] target/ppc: 405: Add missing exception handlers, (continued)
- [PATCH 5/8] target/ppc: 405: Critical exceptions cleanup, Fabiano Rosas, 2022/01/10
- [PATCH 7/8] target/ppc: 405: External exception cleanup, Fabiano Rosas, 2022/01/10
- [PATCH 3/8] target/ppc: Introduce powerpc_excp_40x, Fabiano Rosas, 2022/01/10
- [PATCH 6/8] target/ppc: 405: Machine check exception cleanup, Fabiano Rosas, 2022/01/10
- [PATCH 8/8] target/ppc: 405: System call exception cleanup, Fabiano Rosas, 2022/01/10
- Re: [PATCH 8/8] target/ppc: 405: System call exception cleanup,
David Gibson <=
- Re: [PATCH 0/8] target/ppc: powerpc_excp improvements [40x] (3/n), Cédric Le Goater, 2022/01/11