File target-alpha-fix-tlb_fill-trap_arg2-valu.patch of Package qemu

Overview Repositories Revisions Requests Users Attributes Meta

File target-alpha-fix-tlb_fill-trap_arg2-valu.patch of Package qemu (Revision 2b2ec40cac84f0f7228f35537d83fcee)

Currently displaying revision 2b2ec40cac84f0f7228f35537d83fcee , Show latest

From: Aurelien Jarno <aurelien@aurel32.net>
Date: Thu, 22 Aug 2019 10:45:14 -0700
Subject: target/alpha: fix tlb_fill trap_arg2 value for instruction fetch

Git-commit: cb1de55a83eaca9ee32be9c959dca99e11f2fea8

Commit e41c94529740cc26 ("target/alpha: Convert to CPUClass::tlb_fill")
slightly changed the way the trap_arg2 value is computed in case of TLB
fill. The type of the variable used in the ternary operator has been
changed from an int to an enum. This causes the -1 value to not be
sign-extended to 64-bit in case of an instruction fetch. The trap_arg2
ends up with 0xffffffff instead of 0xffffffffffffffff. Fix that by
changing the -1 into -1LL.

This fixes the execution of user space processes in qemu-system-alpha.

Fixes: e41c94529740cc26
Cc: qemu-stable@nongnu.org
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
[rth: Test MMU_DATA_LOAD and MMU_DATA_STORE instead of implying them.]
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 target/alpha/helper.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/target/alpha/helper.c b/target/alpha/helper.c
index 93b8e788b185f8b199b71256e5ff..d0cc6231925c932c192640632658 100644
--- a/target/alpha/helper.c
+++ b/target/alpha/helper.c
@@ -283,7 +283,9 @@ bool alpha_cpu_tlb_fill(CPUState *cs, vaddr addr, int size,
         cs->exception_index = EXCP_MMFAULT;
         env->trap_arg0 = addr;
         env->trap_arg1 = fail;
-        env->trap_arg2 = (access_type == MMU_INST_FETCH ? -1 : access_type);
+        env->trap_arg2 = (access_type == MMU_DATA_LOAD ? 0ull :
+                          access_type == MMU_DATA_STORE ? 1ull :
+                          /* access_type == MMU_INST_FETCH */ -1ull);
         cpu_loop_exit_restore(cs, retaddr);
     }

Places

File target-alpha-fix-tlb_fill-trap_arg2-valu.patch of Package qemu (Revision 2b2ec40cac84f0f7228f35537d83fcee)

Places