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Message-ID: <20120929054156.GA20623@brightrain.aerifal.cx>
Date: Sat, 29 Sep 2012 01:41:57 -0400
From: Rich Felker <dalias@...ifal.cx>
To: musl@...ts.openwall.com
Subject: microblaze port committed
Hi all,
I've committed the initial (and seemingly fully-working) version of
the microblaze port. Several caveats:
1. Upstream binutils has a serious bug in gas whereby the relocations
it generates for symbols with local weak definitions cannot be
resolved by the linker. Patch at:
http://permalink.gmane.org/gmane.linux.uclinux.microblaze/11155
2. The toolchain binaries from Xilinx seem to produce .o files
incompatible with standard binutils, and vice versa. Pick one or
the other; don't mix them.
3. Threads are untested because qemu is broken, at least my version of
qemu (app-level emu) has a bug where clone() does not advance the
program counter properly in the child, so it starts a forkbomb-like
cascade of clone syscalls (thankfully just linear growth rather
than exponential).
4. Until very recently, qemu did not support the lwx/swx instructions
needed for implementing atomics, and treated them instead as plain
lw/sw (load/store). I've added one otherwise-wasteful instruction
to the atomic asm in atomic.h so that atomic cas/swap will at least
behave as an equivalent non-atomic operation on older qemu, rather
than randomly going into infinite loop. Older hardware may be
affected by this issue too.
I'm sure we'll find other problems once there's a better build/test
environent in-place, but overall this seems to be the best
initial-commit quality of any port yet, probably due to the fact that
the microblaze ISA+ABI is the sanest, simplest ISA+ABI I've ever coded
to.
Rich
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