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SubjectRe: [RFC] ARC: initial ftrace support
Hi Claudiu,

Is is possible to switch between mcount modes (Linux-style <-> baremetal-style) via command-line options for ARC GCC?

>From: Alexey Brodkin <>
>Sent: Thursday, April 2, 2020 17:15
>To: Claudiu Zissulescu Ianculescu
>Cc:; Steven Rostedt; Ingo Molnar;; Eugeniy Paltsev; Vineet Gupta
>Subject: RE: [RFC] ARC: initial ftrace support
> Hi Claus,
>> -----Original Message-----
>> From: linux-snps-arc <> On Behalf Of Claudiu Zissulescu
>> Ianculescu
>> Sent: Thursday, April 2, 2020 11:10 AM
>> To: Vineet Gupta <>
>> Cc: Alexey Brodkin <>;; Steven Rostedt
>> <>; Ingo Molnar <>;; Eugeniy
>> Paltsev <>
>> Subject: Re: [RFC] ARC: initial ftrace support
>> Hi,
>> ARC-gcc has two modes to call the mcount routines. When using elf32
>> configuration, the toolchain is set to use newlib mcount. When
>> configured for linux, gcc toolchain is using a library call to _mcall
>> (single underscore) having blink as input argument.
>> So, using the proper linux toolchain, your patch should work.
> Is there a chance to switch to Linux-style mcount in Elf32 toolchain with a command-line
> option?
> Otherwise I guess we'll need to implement some warning which explicitly says why Elf32
> toolchain is not usable for building the Linux kernel... at least in case with ftrace enabled.

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