Messages in this thread | | | Date | Tue, 19 Jun 2018 15:50:10 -0700 | From | Guenter Roeck <> | Subject | Re: [PATCH 0/2] Make badr macro compatible with newer GAS versions |
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On Wed, Jun 20, 2018 at 12:23:56AM +0200, Ard Biesheuvel wrote: > > OK, so even the linker handling is inconsistent. > > Working (binutils 2.30) > > c0301164 <local_restart>: > c0301164: f8d9 a000 ldr.w sl, [r9] > c0301168: e92d 0030 stmdb sp!, {r4, r5} > c030116c: f01a 0ff0 tst.w sl, #240 ; 0xf0 > c0301170: d117 bne.n c03011a2 <__sys_trace> > c0301172: 46ba mov sl, r7 > c0301174: f5ba 7fc8 cmp.w sl, #400 ; 0x190 > c0301178: bf28 it cs > c030117a: f04f 0a00 movcs.w sl, #0 > c030117e: f3af 8014 csdb > c0301182: f2af 1e83 subw lr, pc, #387 ; 0x183 > c0301182: R_ARM_THM_ALU_PREL_11_0 .Lsym28 > > > Broken (binutils 2.26) > > c0301184 <local_restart>: > c0301184: f8d9 a000 ldr.w sl, [r9] > c0301188: e92d 0030 stmdb sp!, {r4, r5} > c030118c: f01a 0ff0 tst.w sl, #240 ; 0xf0 > c0301190: d117 bne.n c03011c2 <__sys_trace> > c0301192: 46ba mov sl, r7 > c0301194: f5ba 7fc8 cmp.w sl, #400 ; 0x190 > c0301198: bf28 it cs > c030119a: f04f 0a00 movcs.w sl, #0 > c030119e: f3af 8014 csdb > c03011a2: f2af 1ea2 subw lr, pc, #418 ; 0x1a2 > c03011a2: R_ARM_THM_ALU_PREL_11_0 .Lsym30 > > > Note the even immediate in the subw instruction. So this is another > dead end, unfortunately. > Looks like someone is trying to make things really difficunt :-(. I think I'll just stick with binutils 2.28.1. Not optimal, but at least it works.
Something else: I can boot Cortex-M under qemu (-M mps2-an385). The only problem I have is this:
/ # kill -1 1 [ 3.806568] [ 3.806568] Unhandled exception: IPSR = 00000006 LR = fffffffd [ 3.807221] CPU: 0 PID: 1 Comm: init Not tainted 4.18.0-rc1-00043-gba4dbdedd3ed #42 [ 3.807590] Hardware name: MPS2 (Device Tree Support) [ 3.808162] PC is at (null) [ 3.808374] LR is at 0x2170fc37 [ 3.808549] pc : [<00000000>] lr : [<2170fc37>] psr: 60000000 [ 3.808841] sp : 21761b90 ip : 21761f00 fp : 21758c04 [ 3.809118] r10: 00000000 r9 : 00000000 r8 : 00000000 [ 3.809329] r7 : 00000000 r6 : 00000001 r5 : 00000000 r4 : 2175452c [ 3.809565] r3 : 00000000 r2 : 00000000 r1 : 00000000 r0 : 00000001 [ 3.809791] xPSR: 60000000 [ 3.809926] CPU: 0 PID: 1 Comm: init Not tainted 4.18.0-rc1-00043-gba4dbdedd3ed #42 [ 3.810179] Hardware name: MPS2 (Device Tree Support) [ 3.811246] [<2100bd8d>] (unwind_backtrace) from [<2100b13b>] (show_stack+0xb/0xc) [ 3.811656] [<2100b13b>] (show_stack) from [<2100b87b>] (__invalid_entry+0x4b/0x4c)
Everything else seems to work, just sending a signal to init causes it to blow up. Any idea what might cause this ?
Thanks, Guenter
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