From d96391c1ffeb30a0afa695c86579517c69d9a889 Mon Sep 17 00:00:00 2001 From: James Hogan Date: Wed, 27 Apr 2016 23:21:06 +0100 Subject: target-mips: Fix RDHWR exception host PC Commit b00c72180c36 ("target-mips: add PC, XNP reg numbers to RDHWR") changed the rdhwr helpers to use check_hwrena() to check the register being accessed is enabled in CP0_HWREna when used from user mode. If that check fails an EXCP_RI exception is raised at the host PC calculated with GETPC(). However check_hwrena() may not be fully inlined as the do_raise_exception() part of it is common regardless of the arguments. This causes GETPC() to calculate the address in the call in the helper instead of the generated code calling the helper. No TB will be found and the EPC reported with the resulting guest RI exception points to the beginning of the TB instead of the RDHWR instruction. We can't reliably force check_hwrena() to be inlined, and converting it to a macro would be ugly, so instead pass the host PC in as an argument, with each rdhwr helper passing GETPC(). This should avoid any dependence on compiler behaviour, and in practice seems to ensure the full inlining of check_hwrena() on x86_64. This issue causes failures when running a MIPS KVM (trap & emulate) guest in a MIPS QEMU TCG guest, as the inner guest kernel will do a RDHWR of counter, which is disabled in the outer guest's CP0_HWREna by KVM so it can emulate the inner guest's counter. The emulation fails and the RI exception is passed to the inner guest. Fixes: b00c72180c36 ("target-mips: add PC, XNP reg numbers to RDHWR") Signed-off-by: James Hogan Cc: Leon Alrae Cc: Yongbok Kim Cc: Aurelien Jarno Reviewed-by: Aurelien Jarno Reviewed-by: Leon Alrae Signed-off-by: Leon Alrae --- target-mips/op_helper.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) (limited to 'target-mips/op_helper.c') diff --git a/target-mips/op_helper.c b/target-mips/op_helper.c index 8ec1bef7d0..4417e6ba22 100644 --- a/target-mips/op_helper.c +++ b/target-mips/op_helper.c @@ -2294,29 +2294,29 @@ void helper_deret(CPUMIPSState *env) } #endif /* !CONFIG_USER_ONLY */ -static inline void check_hwrena(CPUMIPSState *env, int reg) +static inline void check_hwrena(CPUMIPSState *env, int reg, uintptr_t pc) { if ((env->hflags & MIPS_HFLAG_CP0) || (env->CP0_HWREna & (1 << reg))) { return; } - do_raise_exception(env, EXCP_RI, GETPC()); + do_raise_exception(env, EXCP_RI, pc); } target_ulong helper_rdhwr_cpunum(CPUMIPSState *env) { - check_hwrena(env, 0); + check_hwrena(env, 0, GETPC()); return env->CP0_EBase & 0x3ff; } target_ulong helper_rdhwr_synci_step(CPUMIPSState *env) { - check_hwrena(env, 1); + check_hwrena(env, 1, GETPC()); return env->SYNCI_Step; } target_ulong helper_rdhwr_cc(CPUMIPSState *env) { - check_hwrena(env, 2); + check_hwrena(env, 2, GETPC()); #ifdef CONFIG_USER_ONLY return env->CP0_Count; #else @@ -2326,19 +2326,19 @@ target_ulong helper_rdhwr_cc(CPUMIPSState *env) target_ulong helper_rdhwr_ccres(CPUMIPSState *env) { - check_hwrena(env, 3); + check_hwrena(env, 3, GETPC()); return env->CCRes; } target_ulong helper_rdhwr_performance(CPUMIPSState *env) { - check_hwrena(env, 4); + check_hwrena(env, 4, GETPC()); return env->CP0_Performance0; } target_ulong helper_rdhwr_xnp(CPUMIPSState *env) { - check_hwrena(env, 5); + check_hwrena(env, 5, GETPC()); return (env->CP0_Config5 >> CP0C5_XNP) & 1; } -- cgit v1.2.3