[PATCH 2/3] fix matching errors related to i386 addressing modes in CFI generation script

[Alex Dowad <alexinbeijing@gmail.com>]

the regexps previously used to identify registers clobbered by MOVs, ADDs,
and various other operations would erroneously match index registers. In other
words, the following asm:

    mov $0, (%eax,%ebx,4)

...would cause EBX to be considered as overwritten, which might prevent a
debugger from displaying a variable's value in a higher stack frame.

thanks to Rich Felker for noticing this problem.
---
 tools/add-cfi.i386.awk | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/tools/add-cfi.i386.awk b/tools/add-cfi.i386.awk
index fc0d8cf..bd7932f 100644
--- a/tools/add-cfi.i386.awk
+++ b/tools/add-cfi.i386.awk
@@ -184,13 +184,13 @@ function trashed(register) {
 }
 # this does NOT exhaustively check for all possible instructions which could
 # overwrite a register value inherited from the caller (just the common ones)
-/mov.*,%e(ax|bx|cx|dx|si|di|bp)/  { trashed(get_reg2()) }
-/(add|addl|sub|subl|and|or|xor|lea|sal|sar|shl|shr).*,%e(ax|bx|cx|dx|si|di|bp)/ {
+/mov.*,%e(ax|bx|cx|dx|si|di|bp)$/  { trashed(get_reg2()) }
+/(add|addl|sub|subl|and|or|xor|lea|sal|sar|shl|shr).*,%e(ax|bx|cx|dx|si|di|bp)$/ {
   trashed(get_reg2())
 }
-/^i?mul [^,]*$/                     { trashed("eax"); trashed("edx") }
-/^i?mul.*,%e(ax|bx|cx|dx|si|di|bp)/ { trashed(get_reg2()) }
-/^i?div/                            { trashed("eax"); trashed("edx") }
+/^i?mul [^,]*$/                      { trashed("eax"); trashed("edx") }
+/^i?mul.*,%e(ax|bx|cx|dx|si|di|bp)$/ { trashed(get_reg2()) }
+/^i?div/                             { trashed("eax"); trashed("edx") }
 /(dec|inc|not|neg|pop) %e(ax|bx|cx|dx|si|di|bp)/  { trashed(get_reg()) }
 /cpuid/ { trashed("eax"); trashed("ebx"); trashed("ecx"); trashed("edx") }
 
-- 
2.0.0.GIT