From mboxrd@z Thu Jan 1 00:00:00 1970 From: liuwenliang@huawei.com (Liuwenliang (Lamb)) Date: Tue, 17 Oct 2017 13:02:06 +0000 Subject: [PATCH 04/11] Define the virtual space of KASan's shadow region In-Reply-To: References: <20171011082227.20546-5-liuwenliang@huawei.com> <201710141957.mbxeZJHB%fengguang.wu@intel.com> Message-ID: To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 10/17/2017 8:45 PM, Abbott Liu wrote: >What I said was > >'if the value of TASK_SIZE fits its 12-bit immediate field' > >and your value of TASK_SIZE is 0xb6e00000, which cannot be decomposed in the right way. > >If you build with KASAN disabled, it will generate a mov instruction instead. Thanks for your explain. I understand now. I has tested and the testing result proves that what you said is right. Here is test log: c010e9e0 <__irq_svc>: c010e9e0: e24dd04c sub sp, sp, #76 ; 0x4c c010e9e4: e31d0004 tst sp, #4 c010e9e8: 024dd004 subeq sp, sp, #4 c010e9ec: e88d1ffe stm sp, {r1, r2, r3, r4, r5, r6, r7, r8, r9, sl, fp, ip} c010e9f0: e8900038 ldm r0, {r3, r4, r5} c010e9f4: e28d7030 add r7, sp, #48 ; 0x30 c010e9f8: e3e06000 mvn r6, #0 c010e9fc: e28d204c add r2, sp, #76 ; 0x4c c010ea00: 02822004 addeq r2, r2, #4 c010ea04: e52d3004 push {r3} ; (str r3, [sp, #-4]!) c010ea08: e1a0300e mov r3, lr c010ea0c: e887007c stm r7, {r2, r3, r4, r5, r6} c010ea10: e1a0972d lsr r9, sp, #14 c010ea14: e1a09709 lsl r9, r9, #14 c010ea18: e5990008 ldr r0, [r9, #8] c010ea1c: e3a014bf mov r1, #-1090519040 ; 0xbf000000 // ldr r1,=0xbf000000