linux-kernel - Re: [PATCH 7/7] DWARF: add the config option

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Message-ID: <f4a85bab-3331-3342-0e68-ee75b3e34b1f@suse.cz>
Date:   Fri, 26 May 2017 08:54:50 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     Josh Poimboeuf <jpoimboe@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>
Cc:     linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        live-patching@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        the arch/x86 maintainers <x86@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Jiri Kosina <jikos@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 7/7] DWARF: add the config option

On 05/19/2017, 11:35 PM, Josh Poimboeuf wrote:
>   https://github.com/jpoimboe/linux/blob/undwarf/arch/x86/kernel/unwind_undwarf.c

JFYI, it crashes in sha1_transform_avx due to crypto changes. You
perhaps missed that this beast uses ebp (not rbp) register for
computations. I had to do:

--- a/arch/x86/crypto/sha1_ssse3_asm.S
+++ b/arch/x86/crypto/sha1_ssse3_asm.S
@@ -37,7 +37,7 @@
 #define REG_A  %ecx
 #define REG_B  %esi
 #define REG_C  %edi
-#define REG_D  %ebp
+#define REG_D  %r12d
 #define REG_E  %edx

 #define REG_T1 %eax
@@ -74,6 +74,7 @@
        SYM_FUNC_START(\name)

        push    %rbx
+       push    %r12
        push    %rbp

        mov     %rsp, %rbp
@@ -99,6 +100,7 @@
        rep stosq

        leaveq                          # deallocate workspace
+       pop     %r12
        pop     %rbx
        ret


I am afraid there are more of these, e.g. in aesni-intel_asm.S.

thanks,
-- 
js
suse labs