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[PULL,16/35] target/ppc: Sign-extend large decrementer to 64-bits

Message ID 20230904090630.725952-17-clg@kaod.org
State New
Headers show
Series [PULL,01/35] target/ppc: Generate storage interrupts for radix RC changes | expand

Commit Message

Cédric Le Goater Sept. 4, 2023, 9:06 a.m. UTC 
From: Nicholas Piggin <npiggin@gmail.com>

When storing a large decrementer value with the most significant
implemented bit set, it is to be treated as a negative and sign
extended.

This isn't hit for book3s DEC because of another bug, fixing it
in the next patch exposes this one and can cause additional
problems, so fix this first. It can be hit with HDECR and other
edge triggered types.

Fixes: a8dafa52518 ("target/ppc: Implement large decrementer support for TCG")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
---
 hw/ppc/ppc.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)
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Patch

diff --git a/hw/ppc/ppc.c b/hw/ppc/ppc.c
index a397820d9c34..fb4784793ce1 100644
--- a/hw/ppc/ppc.c
+++ b/hw/ppc/ppc.c
@@ -743,7 +743,9 @@  target_ulong cpu_ppc_load_decr(CPUPPCState *env)
      * to 64 bits, otherwise it is a 32 bit value.
      */
     if (env->spr[SPR_LPCR] & LPCR_LD) {
-        return decr;
+        PowerPCCPU *cpu = env_archcpu(env);
+        PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
+        return sextract64(decr, 0, pcc->lrg_decr_bits);
     }
     return (uint32_t) decr;
 }
@@ -762,7 +764,9 @@  target_ulong cpu_ppc_load_hdecr(CPUPPCState *env)
      * extended to 64 bits, otherwise it is 32 bits.
      */
     if (pcc->lrg_decr_bits > 32) {
-        return hdecr;
+        PowerPCCPU *cpu = env_archcpu(env);
+        PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
+        return sextract64(hdecr, 0, pcc->lrg_decr_bits);
     }
     return (uint32_t) hdecr;
 }