https://sourceware.org/bugzilla/show_bug.cgi?id=29004
Nelson Chu <nelsonc1225 at sourceware dot org> changed:
What |Removed |Added
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CC| |nelsonc1225 at sourceware dot
org
--- Comment #2 from Nelson Chu <nelsonc1225 at sourceware dot org> ---
(In reply to Mark Manning from comment #0)
> The following macro has worked perfectly for decades with numerous versions
> of the GNU assembler for countless processors but fails with riscv.
>
> .macro _header_ name, cfa
> .section .data // assemble into head space
> .quad _thread
> .set _thread, .
> 8: // address to link next word header against
> hstring "\name"
> .set lex, 0
> .quad \cfa // point header at new words cfa
> .previous // assemble into list space
> .endm
>
>
> the .set _thread . is where it fails. This was originally a highly critical
> bug for me as not having this macro in a working state killed my project but
> I found a workaround
>
> ...
> .set _thread, 9f
> 9:
> ...
Not sure what's . fails mean. I can get the same symbol value 8 for _thread,
when using . and 9f:
% cat tmp.s
.macro _header_ name, cfa
.section .data # assemble into head space
.quad _thread
.set _thread, .
8: # address to link next word header against
.string "\name"
.set lex, 0
.quad \cfa # point header at new words cfa
.previous # assemble into list space
.endm
_header_ A, B
% riscv64-unknown-elf-as -mno-arch-attr tmp.s -o tmp.o
% riscv64-unknown-elf-readelf -Ws tmp.o
Symbol table '.symtab' contains 7 entries:
Num: Value Size Type Bind Vis Ndx Name
0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND
1: 0000000000000000 0 SECTION LOCAL DEFAULT 1 .text
2: 0000000000000000 0 SECTION LOCAL DEFAULT 2 .data
3: 0000000000000000 0 SECTION LOCAL DEFAULT 4 .bss
4: 0000000000000008 0 NOTYPE LOCAL DEFAULT 2 _thread
5: 0000000000000000 0 NOTYPE LOCAL DEFAULT ABS lex
6: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND B
> Second problem, the RISCV version of the GNU assembler does not allow me to
> alias register names so now i have to remember that x29 is my floating point
> stack pointer, x28 is my return stack pointer, x27 is my parameter stack
> pointer, x26 is my interpretive pointer and x25 and x24 are my w1 and w2
> working registers respectively.
Could you please share which directive or which method that you expect to alias
register names? Thanks.
> Last bug, for some reason I cannot do .ascii "abcd;efgh" because the
> semicolon throws things off... i cant even explain the error here it
> literally makes no sense based on the text of the source...
>
> compile.s:207: Error: junk at end of line, first unrecognized character is
> `:'
I don't get error for this...
% cat tmp.s
.ascii "abcd;efgh"
% riscv64-unknown-elf-as -mno-arch-attr tmp.s -o tmp.o
% riscv64-unknown-elf-objdump -sj .text tmp.o
tmp.o: file format elf64-littleriscv
Contents of section .text:
0000 61626364 3b656667 68000000 abcd;efgh...
>
> where line 207 is...
> .colon "(;)", p_semi
>
> and this is the macros it invokes which works flawlessly if there is no ; in
> the word name....
>
> .macro .colon name, cfa
> .header "\name", \cfa
> \cfa:
> jal x25, nest
> .endm
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