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07 Apr 2021 08:30:53 -0700 IronPort-SDR: S/zRMmFYPV/GfPI1LS+wpGzLIjw7o2v/mGiuL8CAguAfgkFeylt/UnGYKywFpaTukM6ayibUy8 U8s6c8bznjYQF/fFN25skPrIhbKmj2+f4YegA1lx8mRySeparspDzx4toCMPUWOEK4phZjpe8T 1T6E8/kKepyQacW34LF5dGeONW75ZVW80qbMzgxKyO+I3QnqEukPhCkDP2SZMlhn+WTyYTra/j 7mUbbYKqIMyhmpoftI+CByFNFaxFhOB56JO2jdoGin5eh4rAnp+vCFkZ/ZOsFVxFOzfCpnh4fZ P3I= WDCIronportException: Internal Received: from unknown (HELO twashi.fujisawa.hgst.com) ([10.225.163.90]) by uls-op-cesaip01.wdc.com with ESMTP; 07 Apr 2021 08:49:33 -0700 From: Damien Le Moal To: Palmer Dabbelt , linux-riscv@lists.infradead.org, Alexander Viro , linux-kernel@vger.kernel.org Cc: Max Filippov , Greg Ungerer , Anup Patel , Christoph Hellwig Subject: [PATCH v2 2/2] riscv: Disable text-data gap in flat binaries Date: Thu, 8 Apr 2021 00:49:24 +0900 Message-Id: <20210407154924.1557489-3-damien.lemoal@wdc.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210407154924.1557489-1-damien.lemoal@wdc.com> References: <20210407154924.1557489-1-damien.lemoal@wdc.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210407_164940_963742_B7A34BA6 X-CRM114-Status: GOOD ( 10.65 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org uclibc/gcc combined with elf2flt riscv linker file fully resolve the PC relative __global_pointer$ value at compile time and do not generate a relocation entry to set a runtime gp value. As a result, if the flatbin loader introduces a gap between the text and data sections, the gp value becomes incorrect and prevent correct execution of a flatbin executable. Avoid this problem by enabling CONFIG_BINFMT_FLAT_NO_TEXT_DATA_GAP automatically when CONFIG_RISCV is enabled and CONFIG_MMU disabled. Signed-off-by: Damien Le Moal --- arch/riscv/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 0d0cf67359cb..6a85fbbd056e 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -33,6 +33,7 @@ config RISCV select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU select ARCH_WANT_FRAME_POINTERS select ARCH_WANT_HUGE_PMD_SHARE if 64BIT + select BINFMT_FLAT_NO_TEXT_DATA_GAP if !MMU select CLONE_BACKWARDS select CLINT_TIMER if !MMU select COMMON_CLK -- 2.30.2 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv