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An Event-Based Branch (EBB) allows applications to change the NIA when a event-based exception occurs. Event-based exceptions are enabled by setting the Branch Event Status and Control Register (BESCR). If the event-based exception is enabled when the exception occurs, an EBB happens. The following operations happens during an EBB: - Global Enable (GE) bit of BESCR is set to 0; - bits 0-61 of the Event-Based Branch Return Register (EBBRR) are set to the the effective address of the NIA that would have executed if the EBB didn't happen; - Instruction fetch and execution will continue in the effective address contained in the Event-Based Branch Handler Register (EBBHR). The EBB Handler will process the event and then execute the Return From Event-Based Branch (rfebb) instruction. rfebb sets BESCR_GE and then redirects execution to the address pointed in EBBRR. This process is described in the PowerISA v3.1, Book II, Chapter 6 [1]. This patch implements the rfebb instruction. Descriptions of all relevant BESCR bits are also added - this patch is only using BESCR_GE, but the next patches will use the remaining bits. [1] https://wiki.raptorcs.com/w/images/f/f5/PowerISA_public.v3.1.pdf Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Reviewed-by: Matheus Ferst <matheus.ferst@eldorado.org.br> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com> Message-Id: <20211201151734.654994-9-danielhb413@gmail.com> Signed-off-by: Cédric Le Goater <clg@kaod.org> |
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| .. | ||
| translate | ||
| arch_dump.c | ||
| compat.c | ||
| cpu_init.c | ||
| cpu-models.c | ||
| cpu-models.h | ||
| cpu-param.h | ||
| cpu-qom.h | ||
| cpu.c | ||
| cpu.h | ||
| dfp_helper.c | ||
| excp_helper.c | ||
| fpu_helper.c | ||
| gdbstub.c | ||
| helper_regs.c | ||
| helper_regs.h | ||
| helper.h | ||
| insn32.decode | ||
| insn64.decode | ||
| int_helper.c | ||
| internal.h | ||
| Kconfig | ||
| kvm_ppc.h | ||
| kvm-stub.c | ||
| kvm.c | ||
| machine.c | ||
| mem_helper.c | ||
| meson.build | ||
| mfrom_table_gen.c | ||
| mfrom_table.c.inc | ||
| misc_helper.c | ||
| mmu_common.c | ||
| mmu_helper.c | ||
| mmu-book3s-v3.c | ||
| mmu-book3s-v3.h | ||
| mmu-books.h | ||
| mmu-hash32.c | ||
| mmu-hash32.h | ||
| mmu-hash64.c | ||
| mmu-hash64.h | ||
| mmu-radix64.c | ||
| mmu-radix64.h | ||
| monitor.c | ||
| power8-pmu-regs.c.inc | ||
| power8-pmu.c | ||
| power8-pmu.h | ||
| spr_tcg.h | ||
| tcg-stub.c | ||
| timebase_helper.c | ||
| trace-events | ||
| trace.h | ||
| translate.c | ||
| user_only_helper.c | ||