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Mon, 20 Sep 2021 16:06:22 +0800 (CST) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=xen0n.name; s=mail; t=1632125182; bh=0eHzsl2x/Qi54fYRqdqvLO1ukdxYXSVcFQeFmk/nHbA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=f4v3cBl3pSfJ4bTgZaADidgsf0YtpVpfdLBZFCoJAOXMjuiNptoCTmsQItmBuMakf 29SUt4BqAe2NEQeqRLozH24Bjondegr81SYMDbAaSoG5ekeZx1nM9Dc4gOg5Izr9Vz e85um5b5wD7nrD5t1Wyyihz79ggFI0LszLyiOkPI= From: WANG Xuerui To: qemu-devel@nongnu.org Subject: [PATCH 30/30] accel/tcg/user-exec: Implement CPU-specific signal handler for LoongArch hosts Date: Mon, 20 Sep 2021 16:04:51 +0800 Message-Id: <20210920080451.408655-31-git@xen0n.name> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210920080451.408655-1-git@xen0n.name> References: <20210920080451.408655-1-git@xen0n.name> MIME-Version: 1.0 X-Host-Lookup-Failed: Reverse DNS lookup failed for 115.28.160.31 (failed) Received-SPF: pass client-ip=115.28.160.31; envelope-from=git@xen0n.name; helo=mailbox.box.xen0n.name X-Spam_score_int: -12 X-Spam_score: -1.3 X-Spam_bar: - X-Spam_report: (-1.3 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RDNS_NONE=0.793, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-Mailman-Approved-At: Mon, 20 Sep 2021 09:57:24 -0400 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: WANG Xuerui Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Signed-off-by: WANG Xuerui --- accel/tcg/user-exec.c | 83 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 83 insertions(+) diff --git a/accel/tcg/user-exec.c b/accel/tcg/user-exec.c index 8fed542622..0f85062e61 100644 --- a/accel/tcg/user-exec.c +++ b/accel/tcg/user-exec.c @@ -878,6 +878,89 @@ int cpu_signal_handler(int host_signum, void *pinfo, return handle_cpu_signal(pc, info, is_write, &uc->uc_sigmask); } +#elif defined(__loongarch__) + +/* + * This logic is bitness-agnostic, so the generic __loongarch__ guard is used + * instead of explicit ones like __loongarch64. + */ + +int cpu_signal_handler(int host_signum, void *pinfo, + void *puc) +{ + siginfo_t *info = pinfo; + ucontext_t *uc = puc; + greg_t pc = uc->uc_mcontext.__pc; + uint32_t insn = *(uint32_t *)pc; + int is_write = 0; + + /* Detect store by reading the instruction at the program counter. */ + switch ((insn >> 26) & 0b111111) { + case 0b001000: /* {ll,sc}.[wd] */ + switch ((insn >> 24) & 0b11) { + case 0b01: /* sc.w */ + case 0b11: /* sc.d */ + is_write = 1; + break; + } + break; + case 0b001001: /* {ld,st}ox4.[wd] ({ld,st}ptr.[wd]) */ + switch ((insn >> 24) & 0b11) { + case 0b01: /* stox4.w (stptr.w) */ + case 0b11: /* stox4.d (stptr.d) */ + is_write = 1; + break; + } + break; + case 0b001010: /* {ld,st}.* family */ + switch ((insn >> 22) & 0b1111) { + case 0b0100: /* st.b */ + case 0b0101: /* st.h */ + case 0b0110: /* st.w */ + case 0b0111: /* st.d */ + case 0b1101: /* fst.s */ + case 0b1111: /* fst.d */ + is_write = 1; + break; + } + break; + case 0b001110: /* indexed, atomic, bounds-checking memory operations */ + uint32_t sel = (insn >> 15) & 0b11111111111; + + switch (sel) { + case 0b00000100000: /* stx.b */ + case 0b00000101000: /* stx.h */ + case 0b00000110000: /* stx.w */ + case 0b00000111000: /* stx.d */ + case 0b00001110000: /* fstx.s */ + case 0b00001111000: /* fstx.d */ + case 0b00011101100: /* fstgt.s */ + case 0b00011101101: /* fstgt.d */ + case 0b00011101110: /* fstle.s */ + case 0b00011101111: /* fstle.d */ + case 0b00011111000: /* stgt.b */ + case 0b00011111001: /* stgt.h */ + case 0b00011111010: /* stgt.w */ + case 0b00011111011: /* stgt.d */ + case 0b00011111100: /* stle.b */ + case 0b00011111101: /* stle.h */ + case 0b00011111110: /* stle.w */ + case 0b00011111111: /* stle.d */ + is_write = 1; + break; + default: + /* test for am* instruction range */ + if (0b00011000000 <= sel && sel <= 0b00011100011) { + is_write = 1; + } + break; + } + break; + } + + return handle_cpu_signal(pc, info, is_write, &uc->uc_sigmask); +} + #else #error host CPU specific signal handler needed