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8l, runtime: place G and M pointers relative to _tos on Plan 9, instead of hardcoded values for USTKTOP.

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This should allow executing both on native Plan 9 and inside 9vx.

R=rsc
CC=golang-dev
https://golang.org/cl/3993044
This commit is contained in:
Yuval Pavel Zholkover 2011-02-11 13:39:05 -05:00 committed by Russ Cox
parent bbfad5f1cc
commit 7e77623120
6 changed files with 51 additions and 20 deletions
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1
src/cmd/8l/obj.c
View File

@ -188,6 +188,7 @@ main(int argc, char *argv[])
INITRND = 0;
break;
case 2: /* plan 9 */
tlsoffset = -8;
HEADR = 32L;
if(INITTEXT == -1)
INITTEXT = 4096+32;

29
src/cmd/8l/pass.c
View File

@ -250,6 +250,7 @@ patch(void)
Prog *p, *q;
Sym *s;
int32 vexit;
Sym *plan9_tos;
if(debug['v'])
Bprint(&bso, "%5.2f mkfwd\n", cputime());
@ -260,6 +261,10 @@ patch(void)
Bflush(&bso);
s = lookup("exit", 0);
vexit = s->value;
if(HEADTYPE == 2)
plan9_tos = lookup("_tos", 0);
for(cursym = textp; cursym != nil; cursym = cursym->next) {
for(p = cursym->text; p != P; p = p->link) {
if(HEADTYPE == 10) { // Windows
@ -303,9 +308,15 @@ patch(void)
if(HEADTYPE == 2) { // Plan 9
if(p->from.type == D_INDIR+D_GS
&& p->to.type >= D_AX && p->to.type <= D_DI) {
q = appendp(p);
q->from = p->from;
q->from.type = D_INDIR + p->to.type;
q->to = p->to;
q->as = p->as;
p->as = AMOVL;
p->from.type = D_ADDR+D_STATIC;
p->from.offset += 0xdfffefc0;
p->from.type = D_EXTERN;
p->from.sym = plan9_tos;
p->from.offset = 0;
}
}
if(p->as == ACALL || (p->as == AJMP && p->to.type != D_BRANCH)) {
@ -389,6 +400,7 @@ dostkoff(void)
int a;
Prog *pmorestack;
Sym *symmorestack;
Sym *plan9_tos;
pmorestack = P;
symmorestack = lookup("runtime.morestack", 0);
@ -400,6 +412,9 @@ dostkoff(void)
symmorestack->text->from.scale |= NOSPLIT;
}
if(HEADTYPE == 2)
plan9_tos = lookup("_tos", 0);
for(cursym = textp; cursym != nil; cursym = cursym->next) {
if(cursym->text == nil || cursym->text->link == nil)
continue;
@ -443,8 +458,14 @@ dostkoff(void)
case 2: // Plan 9
p->as = AMOVL;
p->from.type = D_ADDR+D_STATIC;
p->from.offset = 0xdfffefc0;
p->from.type = D_EXTERN;
p->from.sym = plan9_tos;
p->to.type = D_CX;
p = appendp(p);
p->as = AMOVL;
p->from.type = D_INDIR+D_CX;
p->from.offset = tlsoffset + 0;
p->to.type = D_CX;
break;

6
src/pkg/runtime/mkasmh.sh
View File

@ -25,9 +25,9 @@ case "$GOARCH" in
echo '#define m(r) 4(r)'
;;
plan9)
echo '#define get_tls(r)'
echo '#define g(r) 0xdfffefc0'
echo '#define m(r) 0xdfffefc4'
echo '#define get_tls(r) MOVL _tos(SB), r '
echo '#define g(r) -8(r)'
echo '#define m(r) -4(r)'
;;
linux)
# On Linux systems, what we call 0(GS) and 4(GS) for g and m

1
src/pkg/runtime/plan9/386/defs.h
View File

@ -1 +1,2 @@
// nothing to see here
#define tos_pid 48

3
src/pkg/runtime/plan9/386/sys.s
View File

@ -58,7 +58,8 @@ TEXT runtime·rfork(SB),7,$0
MOVL BX, m(AX)
// Initialize AX from _tos->pid
MOVL 0xdfffeff8, AX
MOVL _tos(SB), AX
MOVL tos_pid(AX), AX
MOVL AX, m_procid(BX) // save pid as m->procid
CALL runtime·stackcheck(SB) // smashes AX, CX

29
src/pkg/runtime/plan9/mem.c
View File

@ -10,40 +10,47 @@ static byte *bloc = { end };
enum
{
Round = 7
Round = 4095
};
void*
runtime·SysAlloc(uintptr ask)
runtime·SysAlloc(uintptr nbytes)
{
uintptr bl;
// Plan 9 sbrk from /sys/src/libc/9sys/sbrk.c
bl = ((uintptr)bloc + Round) & ~Round;
if(runtime·brk_((void*)(bl + ask)) < 0)
if(runtime·brk_((void*)(bl + nbytes)) < 0)
return (void*)-1;
bloc = (byte*)bl + ask;
bloc = (byte*)bl + nbytes;
return (void*)bl;
}
void
runtime·SysFree(void *v, uintptr n)
runtime·SysFree(void *v, uintptr nbytes)
{
// from tiny/mem.c
// Push pointer back if this is a free
// of the most recent SysAlloc.
n += (n + Round) & ~Round;
if(bloc == (byte*)v+n)
bloc -= n;
nbytes += (nbytes + Round) & ~Round;
if(bloc == (byte*)v+nbytes)
bloc -= nbytes;
}
void
runtime·SysUnused(void *v, uintptr n)
runtime·SysUnused(void *v, uintptr nbytes)
{
USED(v, n);
USED(v, nbytes);
}
void
runtime·SysMemInit(void)
runtime·SysMap(void *v, uintptr nbytes)
{
USED(v, nbytes);
}
void*
runtime·SysReserve(void *v, uintptr nbytes)
{
return runtime·SysAlloc(nbytes);
}