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Tue, 06 Feb 2024 09:05:50 -0800 (PST) From: YunQiang Su To: nickc@redhat.com Cc: binutils@sourceware.org, macro@orcam.me.uk, xry111@xry111.site Subject: [PATCH v4] MIPS/Gas: Disallow branch to absolute address for PIC Date: Wed, 7 Feb 2024 01:05:38 +0800 Message-Id: <20240206170538.2937169-1-syq@gcc.gnu.org> X-Mailer: git-send-email 2.39.2 MIME-Version: 1.0 X-Spam-Status: No, score=-11.0 required=5.0 tests=BAYES_00, FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM, GIT_PATCH_0, HEADER_FROM_DIFFERENT_DOMAINS, KAM_DMARC_STATUS, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H3, RCVD_IN_MSPIKE_WL, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: binutils@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Binutils mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: binutils-bounces+ouuuleilei=gmail.com@sourceware.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1790170044606117071 X-GMAIL-MSGID: 1790170044606117071 The asm code like b (0) will generate binary like: 00000000 <.text>: 0: 1000ffff b 0x0 0: R_MIPS_PC16 *ABS* 4: 00000000 nop If this object is linked into an PIC/PIC dynamic executable, this branch instruction will jump to a wrong address, with low 16bit unset. Maybe we need a new dynamic relocation, which is not even defined by MIPS psABI, and I don't think that it is worth at all. See PR31343. --- gas/config/tc-mips.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/gas/config/tc-mips.c b/gas/config/tc-mips.c index 43c12de2c8a..f3f5c1f469d 100644 --- a/gas/config/tc-mips.c +++ b/gas/config/tc-mips.c @@ -7560,6 +7560,9 @@ append_insn (struct mips_cl_insn *ip, expressionS *address_expr, ip->insn_opcode |= ((address_expr->X_add_number >> shift) & 0xffff); } + if (mips_pic != NO_PIC && address_expr->X_op == O_constant) + as_bad (_("PIC code branch to absolute address (0x%lx)"), + (unsigned long) address_expr->X_add_number); } break; @@ -7577,6 +7580,9 @@ append_insn (struct mips_cl_insn *ip, expressionS *address_expr, (unsigned long) address_expr->X_add_number); ip->insn_opcode |= ((address_expr->X_add_number >> shift) & 0x1fffff); + if (mips_pic != NO_PIC && address_expr->X_op == O_constant) + as_bad (_("PIC code branch to absolute address (0x%lx)"), + (unsigned long) address_expr->X_add_number); } break; @@ -7594,6 +7600,9 @@ append_insn (struct mips_cl_insn *ip, expressionS *address_expr, (unsigned long) address_expr->X_add_number); ip->insn_opcode |= ((address_expr->X_add_number >> shift) & 0x3ffffff); + if (mips_pic != NO_PIC && address_expr->X_op == O_constant) + as_bad (_("PIC code branch to absolute address (0x%lx)"), + (unsigned long) address_expr->X_add_number); } break;