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[97.113.170.180]) by smtp.gmail.com with ESMTPSA id a18sm6973967pgj.30.2018.11.30.13.52.39 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Fri, 30 Nov 2018 13:52:40 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=8d6/+vDMAvBZgsrjYW7C4rNaADj256qJL0tBGY8IUpM=; b=EpGO1L28KpxiPJuzMayFrp+B5mRHRhs/jMBtgTcNox7cBMT4aQIs4Ua4ZttoVSE2JM h7bkL9MKdznGWwUtcJo5p9T3GB2bXVmFuzFm6ir3I+zNf0amZ4hD/PLmH8u4v00g1Kgw VxLCpi2FtXs0gJD6CtLw55KXYF82oBwAIk8aM= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=8d6/+vDMAvBZgsrjYW7C4rNaADj256qJL0tBGY8IUpM=; b=axAyY6/m6Rf87Z0gcZqnWNoqVWwKLMVVO2VmRG3UbUTX+hCSsl5KwLNBLe+QF8lKAS BCDVr9S5nye+z0AZAIRmyGhgHRbLQmOJrBKABkabcTFVRSbGcYK+zVyLcx0CTX4C+bT/ 2GRyUNEUNyvl9AaIMg6xqTDvH/fZu7ztJtIP0pHl2NU9vSc8QEDVhHG8NjbkvjpLzIit gDkoD7fujYqkhmEwKVJ5spBtTwNihPtfkOoQA+DijKAkzFwdZaOM03w0yelPeHaUmHCq negvNLv39hthkl2nyhWkxe8COklTBFjUR/tXkafv/DoHv7gwX+5J51fO6osFUjISM/fa 8F8w== X-Gm-Message-State: AA+aEWZBoJ6NOQ68QdYwaJD4flPbn9b92oN+1HfL1mPafSziat0Mjjig /pExzms0ojPUUrGfyqyz4cW14EKMi3I= X-Google-Smtp-Source: AFSGD/U4O6q3xyryIwfYzoZ6+a/agBWwxwsXToWTJRuME0q6fMVssPPm8UOuzXQwSsD3logzhXO/uA== X-Received: by 2002:a63:2d82:: with SMTP id t124mr6168883pgt.260.1543614760759; Fri, 30 Nov 2018 13:52:40 -0800 (PST) From: Richard Henderson To: qemu-devel@nongnu.org Date: Fri, 30 Nov 2018 13:52:19 -0800 Message-Id: <20181130215221.20554-15-richard.henderson@linaro.org> X-Mailer: git-send-email 2.17.2 In-Reply-To: <20181130215221.20554-1-richard.henderson@linaro.org> References: <20181130215221.20554-1-richard.henderson@linaro.org> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::442 Subject: [Qemu-devel] [PATCH v3 14/16] tcg/arm: Return false on failure from patch_reloc X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: alex.bennee@linaro.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" This does require an extra two checks within the slow paths to replace the assert that we're moving. Signed-off-by: Richard Henderson Reviewed-by: Alex Benn=C3=A9e --- tcg/arm/tcg-target.inc.c | 22 ++++++++++++++++------ 1 file changed, 16 insertions(+), 6 deletions(-) diff --git a/tcg/arm/tcg-target.inc.c b/tcg/arm/tcg-target.inc.c index deefa20fbf..49f57d655e 100644 --- a/tcg/arm/tcg-target.inc.c +++ b/tcg/arm/tcg-target.inc.c @@ -187,10 +187,14 @@ static const uint8_t tcg_cond_to_arm_cond[] =3D { [TCG_COND_GTU] =3D COND_HI, }; =20 -static inline void reloc_pc24(tcg_insn_unit *code_ptr, tcg_insn_unit *targ= et) +static inline bool reloc_pc24(tcg_insn_unit *code_ptr, tcg_insn_unit *targ= et) { ptrdiff_t offset =3D (tcg_ptr_byte_diff(target, code_ptr) - 8) >> 2; - *code_ptr =3D (*code_ptr & ~0xffffff) | (offset & 0xffffff); + if (offset =3D=3D sextract32(offset, 0, 24)) { + *code_ptr =3D (*code_ptr & ~0xffffff) | (offset & 0xffffff); + return true; + } + return false; } =20 static bool patch_reloc(tcg_insn_unit *code_ptr, int type, @@ -199,7 +203,7 @@ static bool patch_reloc(tcg_insn_unit *code_ptr, int ty= pe, tcg_debug_assert(addend =3D=3D 0); =20 if (type =3D=3D R_ARM_PC24) { - reloc_pc24(code_ptr, (tcg_insn_unit *)value); + return reloc_pc24(code_ptr, (tcg_insn_unit *)value); } else if (type =3D=3D R_ARM_PC13) { intptr_t diff =3D value - (uintptr_t)(code_ptr + 2); tcg_insn_unit insn =3D *code_ptr; @@ -213,7 +217,11 @@ static bool patch_reloc(tcg_insn_unit *code_ptr, int t= ype, } else { int rd =3D extract32(insn, 12, 4); int rt =3D rd =3D=3D TCG_REG_PC ? TCG_REG_TMP : rd; - assert(diff >=3D 0x1000 && diff < 0x100000); + + if (diff < 0x1000 || diff >=3D 0x100000) { + return false; + } + /* add rt, pc, #high */ *code_ptr++ =3D ((insn & 0xf0000000) | (1 << 25) | ARITH_ADD | (TCG_REG_PC << 16) | (rt << 12) @@ -1372,7 +1380,8 @@ static void tcg_out_qemu_ld_slow_path(TCGContext *s, = TCGLabelQemuLdst *lb) TCGMemOp opc =3D get_memop(oi); void *func; =20 - reloc_pc24(lb->label_ptr[0], s->code_ptr); + bool ok =3D reloc_pc24(lb->label_ptr[0], s->code_ptr); + tcg_debug_assert(ok); =20 argreg =3D tcg_out_arg_reg32(s, TCG_REG_R0, TCG_AREG0); if (TARGET_LONG_BITS =3D=3D 64) { @@ -1432,7 +1441,8 @@ static void tcg_out_qemu_st_slow_path(TCGContext *s, = TCGLabelQemuLdst *lb) TCGMemOpIdx oi =3D lb->oi; TCGMemOp opc =3D get_memop(oi); =20 - reloc_pc24(lb->label_ptr[0], s->code_ptr); + bool ok =3D reloc_pc24(lb->label_ptr[0], s->code_ptr); + tcg_debug_assert(ok); =20 argreg =3D TCG_REG_R0; argreg =3D tcg_out_arg_reg32(s, argreg, TCG_AREG0); --=20 2.17.2