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([2607:fb90:b763:d52:6ee3:1cf3:f2d2:e12d]) by smtp.gmail.com with ESMTPSA id fa9-20020a17090af0c900b0027360359b70sm12392489pjb.48.2023.10.10.09.16.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 10 Oct 2023 09:16:15 -0700 (PDT) Message-ID: <692e508d-ea6f-48fa-a885-dcc32fa2f653@linaro.org> Date: Tue, 10 Oct 2023 09:16:10 -0700 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] semihosting/arm-compat: Have TARGET_SYS_EXIT[_EXTENDED] return signed Content-Language: en-US To: =?UTF-8?Q?Philippe_Mathieu-Daud=C3=A9?= , qemu-devel@nongnu.org Cc: =?UTF-8?Q?Alex_Benn=C3=A9e?= References: <20231005062610.57351-1-philmd@linaro.org> From: Richard Henderson In-Reply-To: <20231005062610.57351-1-philmd@linaro.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::62e; envelope-from=richard.henderson@linaro.org; helo=mail-pl1-x62e.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 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, 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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On 10/4/23 23:26, Philippe Mathieu-Daudé wrote: > Per the "Semihosting for AArch32 and AArch64" spec. v2 (2023Q3) [*]: > > 6.5 SYS_EXIT (0x18) > 6.5.2 Entry (64-bit) > > On entry, the PARAMETER REGISTER contains a pointer to > a two-field argument block: > > . field 1 > The exception type, which is one of the set of reason > codes in the above tables. > > . field 2 > A subcode, whose meaning depends on the reason code in > field 1. > > In particular, if field 1 is ADP_Stopped_ApplicationExit > then field 2 is an exit status code, as passed to the C > standard library exit() function. [...] > > Having libc exit() is declared as: > > LIBRARY > Standard C Library (libc, -lc) > > SYNOPSIS > > void > exit(int status); > > the status is expected to be signed. Reviewed-by: Richard Henderson r~