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crti.S: Mark program and data addresses using PRELD. 

* config/mmix/crti.S: Mark program and data addresses using PRELD.
	Remove typo'd and unnecessary alignment-LOC for .data.  Remove
	no-longer-needed LDBU insns.

From-SVN: r192646
This commit is contained in:
Hans-Peter Nilsson 2012-10-21 03:16:47 +00:00 committed by Hans-Peter Nilsson
parent ada750d42e
commit 8a740f0731
2 changed files with 51 additions and 9 deletions
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6
libgcc/ChangeLog
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@ -1,3 +1,9 @@
2012-10-21 Hans-Peter Nilsson <hp@bitrange.com>
* config/mmix/crti.S: Mark program and data addresses using PRELD.
Remove typo'd and unnecessary alignment-LOC for .data. Remove
no-longer-needed LDBU insns.
2012-10-18 Sebastian Huber <sebastian.huber@embedded-brains.de>
* config.host

54
libgcc/config/mmix/crti.S
View File

@ -35,20 +35,25 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
% respectively, so the compiler can switch between them pretending they're
% segments.
% This little treasure is here so the 32 lowest address bits of user data
% will not be zero. Because of truncation, that would cause testcase
% gcc.c-torture/execute/980701-1.c to incorrectly fail.
% This little treasure (some contents) is required so the 32 lowest
% address bits of user data will not be zero. Because of truncation,
% that would cause testcase gcc.c-torture/execute/980701-1.c to
% incorrectly fail.
.data ! mmixal:= 8H LOC Data_Segment
.p2align 3
LOC @+(8-@)@7
OCTA 2009
dstart OCTA 2009
.text ! mmixal:= 9H LOC 8B; LOC #100
.global Main
% The __Stack_start symbol is provided by the link script.
stackpp OCTA __Stack_start
crtstxt OCTA _init % Assumed to be the lowest executed address.
OCTA __etext % Assumed to be beyond the highest executed address.
crtsdat OCTA dstart % Assumed to be the lowest accessed address.
OCTA _end % Assumed to be beyond the highest accessed address.
% "Main" is the magic symbol the simulator jumps to. We want to go
% on to "main".
@ -56,16 +61,47 @@ stackpp OCTA __Stack_start
Main SETL $255,32
PUT rG,$255
% Make sure we have valid memory for addresses in .text and .data (and
% .bss, but we include this in .data), for the benefit of mmo-using
% simulators that require validation of addresses for which contents
% is not present. Due to its implicit-zero nature, zeros in contents
% may be left out in the mmo format, but we don't know the boundaries
% of those zero-chunks; for mmo files from binutils, they correspond
% to the beginning and end of sections in objects before linking. We
% validate the contents by executing PRELD (0; one byte) on each
% 2048-byte-boundary of our .text .data, and we assume this size
% matches the magic lowest-denominator chunk-size for all
% validation-requiring simulators. The effect of the PRELD (any size)
% is assumed to be the same as initial loading of the contents, as
% long as the PRELD happens before the first PUSHJ/PUSHGO. If it
% happens after that, we'll need to distinguish between
% access-for-execution and read/write access.
GETA $255,crtstxt
LDOU $2,$255,0
ANDNL $2,#7ff % Align the start at a 2048-boundary.
LDOU $3,$255,8
SETL $4,2048
0H PRELD 0,$2,0
ADDU $2,$2,$4
CMP $255,$2,$3
BN $255,0B
GETA $255,crtsdat
LDOU $2,$255,0
ANDNL $2,#7ff
LDOU $3,$255,8
0H PRELD 0,$2,0
ADDU $2,$2,$4
CMP $255,$2,$3
BN $255,0B
% Initialize the stack pointer. It is supposedly made a global
% zero-initialized (allowed to change) register in crtn.S; we use the
% explicit number.
GETA $255,stackpp
LDOU $254,$255,0
% Make sure we get more than one mem, to simplify counting cycles.
LDBU $255,$1,0
LDBU $255,$1,1
PUSHJ $2,_init
#ifdef __MMIX_ABI_GNU__