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[Qemu-devel] [PATCH] qemu-system-hppa: Raise exception 26 on emulated ha
From: |
Helge Deller |
Subject: |
[Qemu-devel] [PATCH] qemu-system-hppa: Raise exception 26 on emulated hardware |
Date: |
Sun, 7 Oct 2018 22:51:53 +0200 |
User-agent: |
Mutt/1.9.1 (2017-09-22) |
On PCXS chips (PA7000, pa 1.1a), trap #18 is raised on memory faults,
while all later chips (>= PA7100) generate either trap #26, #27 or #28
(depending on the fault type).
Since the current qemu emulation emulates a B160L machine (with a
PA7300LC PCX-L2 chip, we should raise trap #26 (EXCP_DMAR) instead of
#18 (EXCP_DMP) on access faults by the Linux kernel to page zero.
With the patch we now get the correct output (I tested against real
hardware):
Kernel Fault: Code=26 (Data memory access rights trap) (Addr=00000004)
instead of:
Kernel Fault: Code=18 (Data memory protection/unaligned access trap)
(Addr=00000004)
Signed-off-by: Helge Deller <address@hidden>
diff --git a/target/hppa/mem_helper.c b/target/hppa/mem_helper.c
index ab160c2a74..aecf3075f6 100644
--- a/target/hppa/mem_helper.c
+++ b/target/hppa/mem_helper.c
@@ -137,7 +137,8 @@ int hppa_get_physical_address(CPUHPPAState *env, vaddr
addr, int mmu_idx,
if (unlikely(!(prot & type))) {
/* The access isn't allowed -- Inst/Data Memory Protection Fault. */
- ret = (type & PAGE_EXEC ? EXCP_IMP : EXCP_DMP);
+ ret = (type & PAGE_EXEC ? EXCP_IMP :
+ prot & PAGE_READ ? EXCP_DMP : EXCP_DMAR);
goto egress;
}
- [Qemu-devel] [PATCH] qemu-system-hppa: Raise exception 26 on emulated hardware,
Helge Deller <=