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target/hppa: Raise exception 26 on emulated hardware

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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)
instead of:
 Kernel Fault: Code=18 (Data memory protection/unaligned access trap)

Signed-off-by: Helge Deller <deller@gmx.de>
Message-Id: <20181007205153.GA30270@ls3530.fritz.box>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Helge Deller 2018-10-07 22:51:53 +02:00 committed by Richard Henderson
parent 09558375a6
commit 5f538f7532
1 changed files with 2 additions and 1 deletions
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3
target/hppa/mem_helper.c
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@ -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;
}