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charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer2=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::430; envelope-from=alex.bennee@linaro.org; helo=mail-wr1-x430.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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peter.maydell@linaro.org, qemu-arm@nongnu.org, =?UTF-8?q?Alex=20Benn=C3=A9e?= , Andrew Strauss Errors-To: qemu-devel-bounces+importer2=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) The previous numbers were a guess at best. While we could extract the information from a loaded ELF file via -kernel we could still get tripped up by self decompressing or relocating code. Besides sane library code like newlib will fall back to known symbols to determine of the location of the heap. We can still report the limits though as we are reasonably confident that busting out of RAM would be a bad thing for either stack or heap. Signed-off-by: Alex Benn=C3=A9e Tested-by: Andrew Strauss Reviewed-by: Andrew Strauss Message-Id: <20210601090715.22330-1-alex.bennee@linaro.org> --- v2 - report some known information (limits) - reword the commit message --- semihosting/arm-compat-semi.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/semihosting/arm-compat-semi.c b/semihosting/arm-compat-semi.c index 1c29146dcf..8873486e8c 100644 --- a/semihosting/arm-compat-semi.c +++ b/semihosting/arm-compat-semi.c @@ -1202,10 +1202,14 @@ target_ulong do_common_semihosting(CPUState *cs) retvals[3] =3D 0; /* Stack limit. */ #else limit =3D current_machine->ram_size; - /* TODO: Make this use the limit of the loaded application. */ - retvals[0] =3D rambase + limit / 2; - retvals[1] =3D rambase + limit; - retvals[2] =3D rambase + limit; /* Stack base */ + /* + * Reporting 0 indicates we couldn't calculate the real + * values which should force most software to fall back to + * using information it has. + */ + retvals[0] =3D 0; /* Heap Base */ + retvals[1] =3D rambase + limit; /* Heap Limit */ + retvals[2] =3D 0; /* Stack base */ retvals[3] =3D rambase; /* Stack limit. */ #endif =20 --=20 2.20.1