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| author | Alex Rønne Petersen <alexrp@xamarin.com> | 2013-11-15 15:08:06 +0100 |
|---|---|---|
| committer | Alex Rønne Petersen <alexrp@xamarin.com> | 2013-11-15 15:08:06 +0100 |
| commit | 43b05e3c36d05526f7a9f3f8767569d026e4f1c6 (patch) | |
| tree | 49c1133e751ee72616fddb1a22733d7ec8fa9ebd | |
| parent | 2f56d471f089b8f514377ce501a0c1643652d639 (diff) | |
| download | ffts-43b05e3c36d05526f7a9f3f8767569d026e4f1c6.zip ffts-43b05e3c36d05526f7a9f3f8767569d026e4f1c6.tar.gz | |
Fix the `nop` opcode on some MIPS-based Loongson CPUs.
After much trouble building Mono in Debian/MIPS, @directhex
narrowed it down to this issue:
https://sourceware.org/ml/binutils/2009-11/msg00387.html
So since some of the 2E and 2F versions of the Loongson CPUs
break with a regular `sll zero, zero, 0` we need to issue an
`or at, at, 0`. This makes sure we don't randomly deadlock or
blow up when the CPU is under heavy load.
Yes, really.
| -rw-r--r-- | mips/mips-codegen.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mips/mips-codegen.h b/mips/mips-codegen.h index dc4df7d..1dbd1c6 100644 --- a/mips/mips-codegen.h +++ b/mips/mips-codegen.h @@ -334,7 +334,7 @@ enum { /* misc and coprocessor ops */ #define mips_move(c,dest,src) mips_addu(c,dest,src,mips_zero) #define mips_dmove(c,dest,src) mips_daddu(c,dest,src,mips_zero) -#define mips_nop(c) mips_sll(c,0,0,0) +#define mips_nop(c) mips_or(c,mips_at,mips_at,0) #define mips_break(c,code) mips_emit32(c, ((code)<<6)|13) #define mips_mfhi(c,dest) mips_format_r(c,0,0,0,dest,0,16) #define mips_mflo(c,dest) mips_format_r(c,0,0,0,dest,0,18) |
