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SubjectRe: [PATCH 0/2] Make badr macro compatible with newer GAS versions
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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