34 lines
1.2 KiB
Diff
34 lines
1.2 KiB
Diff
These are experimental fixes for running 32-bit little endian binaries on
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Linux/ppc64le. While this may seem pointless, it does work, does not break
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anything, and may allow enablement of things we couldn't do before (e.g.
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support for box86 and thus reasonably fast emulation of 32-bit x86 games).
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The first part is a signal handler fix, the second part enables the 32-bit
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VDSO by removing the ppc32/big endian restriction.
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Source: @eerykitty
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--- a/arch/powerpc/kernel/signal_32.c
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+++ b/arch/powerpc/kernel/signal_32.c
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@@ -1423,8 +1423,9 @@ int handle_signal32(struct ksignal *ksig, sigset_t *oldset,
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regs->gpr[3] = ksig->sig;
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regs->gpr[4] = (unsigned long) sc;
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regs->nip = (unsigned long) (unsigned long)ksig->ka.sa.sa_handler;
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- /* enter the signal handler in big-endian mode */
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+ /* enter the signal handler in native-endian mode */
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regs->msr &= ~MSR_LE;
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+ regs->msr |= (MSR_KERNEL & MSR_LE);
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return 0;
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badframe:
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--- a/arch/powerpc/platforms/Kconfig.cputype
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+++ b/arch/powerpc/platforms/Kconfig.cputype
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@@ -429,7 +429,6 @@ endmenu
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config VDSO32
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def_bool y
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- depends on PPC32 || CPU_BIG_ENDIAN
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help
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This symbol controls whether we build the 32-bit VDSO. We obviously
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want to do that if we're building a 32-bit kernel. If we're building
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