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target/openrisc: Fixes for memory debugging 

When debugging in gdb you might want to inspect instructions in mapped
pages or in exception vectors like 0x800 etc.  This was previously not
possible in qemu since the *get_phys_page_debug() routine only looked
into the data tlb.

Change to fall back to look into instruction tlb and plain physical
pages.

Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Stafford Horne <shorne@gmail.com>
This commit is contained in:
Stafford Horne 2017-03-13 23:53:29 +09:00
parent 3fee028d1e
commit 461a4b944f
1 changed files with 20 additions and 4 deletions
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24
target/openrisc/mmu.c
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@ -124,7 +124,7 @@ static int cpu_openrisc_get_phys_addr(OpenRISCCPU *cpu,
{
int ret = TLBRET_MATCH;
if (rw == 2) { /* ITLB */
if (rw == MMU_INST_FETCH) { /* ITLB */
*physical = 0;
ret = cpu->env.tlb->cpu_openrisc_map_address_code(cpu, physical,
prot, address, rw);
@ -221,12 +221,28 @@ hwaddr openrisc_cpu_get_phys_page_debug(CPUState *cs, vaddr addr)
OpenRISCCPU *cpu = OPENRISC_CPU(cs);
hwaddr phys_addr;
int prot;
int miss;
if (cpu_openrisc_get_phys_addr(cpu, &phys_addr, &prot, addr, 0)) {
return -1;
/* Check memory for any kind of address, since during debug the
gdb can ask for anything, check data tlb for address */
miss = cpu_openrisc_get_phys_addr(cpu, &phys_addr, &prot, addr, 0);
/* Check instruction tlb */
if (miss) {
miss = cpu_openrisc_get_phys_addr(cpu, &phys_addr, &prot, addr,
MMU_INST_FETCH);
}
return phys_addr;
/* Last, fall back to a plain address */
if (miss) {
miss = cpu_openrisc_get_phys_nommu(cpu, &phys_addr, &prot, addr, 0);
}
if (miss) {
return -1;
} else {
return phys_addr;
}
}
void cpu_openrisc_mmu_init(OpenRISCCPU *cpu)