From 72dd27306224497c8ba97f391d30b774d4d973fb Mon Sep 17 00:00:00 2001 From: Jan Kratochvil Date: Mon, 5 Feb 2018 20:19:49 +0100 Subject: [PATCH] ppc64: Fix stwux encoding With gcc-8.0.1-0.9.fc28.x86_64 I get: ../../gdb/rs6000-tdep.c: In function 'CORE_ADDR skip_prologue(gdbarch*, CORE_ADDR, CORE_ADDR, rs6000_framedata*)': ../../gdb/rs6000-tdep.c:1911:34: error: bitwise comparison always evaluates to false [-Werror=tautological-compare] else if ((op & 0xfc1f016a) == 0x7c01016e) ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~ https://www.ibm.com/support/knowledgecenter/en/ssw_aix_72/com.ibm.aix.alangref/idalangref_stwux_stux_instrs.htm says bit 21 - 30 = 183 Those are bits 1..10 in normal bit order: 183<<1 = 0x16e gdb/ChangeLog 2018-02-04 Jan Kratochvil * rs6000-tdep.c (skip_prologue): Fix stwux encoding. --- gdb/rs6000-tdep.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/gdb/rs6000-tdep.c b/gdb/rs6000-tdep.c index 794605fac1..70dc55fb51 100644 --- a/gdb/rs6000-tdep.c +++ b/gdb/rs6000-tdep.c @@ -1857,7 +1857,7 @@ skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc, CORE_ADDR lim_pc, offset = fdata->offset; continue; } - else if ((op & 0xfc1f016a) == 0x7c01016e) + else if ((op & 0xfc1f016e) == 0x7c01016e) { /* stwux rX,r1,rY */ /* No way to figure out what r1 is going to be. */ fdata->frameless = 0; -- 2.34.1