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91bafd5631
(From OE-Core rev: f35552e4bbf865aa20148b161d5520de025faf02) Signed-off-by: Ting Liu <b28495@freescale.com> Signed-off-by: Saul Wold <sgw@linux.intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
35 lines
960 B
Diff
35 lines
960 B
Diff
powerpc64: fix 64-bit process detection on embedded
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* syscall.c (get_scno) [POWERPC64]: Fix 64-bit process detection
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on embedded powerpc.
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Upstream-Status: Backport
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Signed-off-by: James Yang <james.yang@freescale.com>
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Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>
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diff --git a/syscall.c.orig b/syscall.c
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index 7efee0e..72d9453 100644
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--- a/syscall.c.orig
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+++ b/syscall.c
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@@ -1207,11 +1207,14 @@ get_scno(struct tcb *tcp)
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/* Check for 64/32 bit mode. */
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if (upeek(tcp, sizeof(unsigned long)*PT_MSR, &val) < 0)
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return -1;
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- /* SF is bit 0 of MSR */
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- if (val < 0)
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- currpers = 0;
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- else
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- currpers = 1;
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+
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+ /*
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+ * Check for 64/32 bit mode.
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+ * Embedded implementations covered by Book E extension of PPC use
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+ * bit 0 (CM) of 32-bit Machine state register (MSR).
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+ * Other implementations use bit 0 (SF) of 64-bit MSR.
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+ */
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+ currpers = (val & 0x8000000080000000) ? 0 : 1;
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update_personality(tcp, currpers);
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# endif
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#elif defined(AVR32)
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