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[174.21.70.228]) by smtp.gmail.com with ESMTPSA id u13sm3272110pga.64.2021.06.16.16.15.51 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 16 Jun 2021 16:15:51 -0700 (PDT) Subject: Re: [PATCH 07/21] linux-user/hexagon: Implement setup_sigtramp To: Taylor Simpson , "qemu-devel@nongnu.org" References: <20210616011209.1446045-1-richard.henderson@linaro.org> <20210616011209.1446045-8-richard.henderson@linaro.org> <43f61832-1d76-31dc-4ba4-e35007b16fe7@linaro.org> <94c4e258-e1c3-9d58-f53e-72c4249ea93a@linaro.org> From: Richard Henderson Message-ID: Date: Wed, 16 Jun 2021 16:15:48 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=2607:f8b0:4864:20::62c; envelope-from=richard.henderson@linaro.org; helo=mail-pl1-x62c.google.com X-Spam_score_int: -22 X-Spam_score: -2.3 X-Spam_bar: -- X-Spam_report: (-2.3 / 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, NICE_REPLY_A=-0.17, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action 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: "alex.bennee@linaro.org" , "laurent@vivier.eu" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 6/16/21 2:37 PM, Taylor Simpson wrote: > Yes, I'm confused. Why is signal frame unwinding in libgcc? Because it's tied to the compiler, and it was a decent solution back in 1997. I see llvm calls it libunwind, and only has special signal frame support for aarch64. I wonder if ever other target is expecting unwind info in a vdso? r~