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arm64 TRACE improvement

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modified:   stub/src/arm64-linux.elf-entry.S

	modified:   stub/arm64-linux.elf-entry.h
	modified:   stub/tmp/arm64-linux.elf-entry.bin.dump
This commit is contained in:
John Reiser 2017-05-07 12:06:20 -07:00
parent 90714cf624
commit 082dd7d5ee
1 changed files with 11 additions and 10 deletions
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21
src/stub/src/arm64-linux.elf-entry.S
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@ -162,7 +162,7 @@ D_stm1=0*8
#if DEBUG /*{*/
TRACE_BUFLEN=1024
trace: // DEFICIENCY: modifies condition code
trace: // preserves condition code (thank you, CBNZ) [if write() does!]
stp x0, x1,[sp,#-32*8]!
stp x2, x3,[sp,# 2*8]
stp x4, x5,[sp,# 4*8]
@ -234,20 +234,21 @@ L610: // each word
trace_hex2:
mov w3,#2; b trace_hexwid
trace_hex: // In: x0=val, w1=punctuation before, x2=ptr; Uses: w3, x7
trace_hex: // In: x0=value, w1=punctuation before, x2=ptr; Uses: w3, x8
mov w3,#16 // ndigits
trace_hexwid:
strb w1,[x2],#1; lsr w1,w1,#8; cbnz w1,trace_hexwid // punctuation
adr x7,hex
sub w3,w3,#1
trace_hexwid: // In: x0= value; w1= punctuation; x2= ptr; w3= number of low-order digits
strb w1,[x2],#1; lsr w1,w1,#8; cbnz w1,trace_hexwid // prefix punctuation
adr x8,hex
L620:
cmp w3,#-1+ 8; mov w1,#'_'; strb w1,[x2]; cinc x2,x2,eq
sub w3,w3,#1 // number of less-significant digits
lsl w1,w3,#2 // 4 bits per hex digit
lsr x1,x0,x1 // right justify next digit
lsr x1,x0,x1 // right justify this digit
and x1,x1,#0xf
ldrb w1,[x7, x1]
ldrb w1,[x8, x1]
strb w1,[x2],#1
subs w3,w3,#1; bge L620
sub w1,w3,#8; cbnz w1,0f; mov w1,#'_'; strb w1,[x2],#1 // 8-digit readability
0:
cbnz w3,L620
ret
hex:
.ascii "0123456789abcdef"