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loongarch64: add TLSDESC support

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Xing Li 2024-09-10 09:15:33 +08:00 committed by Rich Felker
parent 9b6a24f9c5
commit 61399d4bd0
3 changed files with 39 additions and 0 deletions
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1
arch/loongarch64/reloc.h
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@ -17,6 +17,7 @@
#define REL_TPOFF R_LARCH_TLS_TPREL64
#define REL_RELATIVE R_LARCH_RELATIVE
#define REL_SYMBOLIC R_LARCH_64
#define REL_TLSDESC R_LARCH_TLS_DESC64
#define CRTJMP(pc,sp) __asm__ __volatile__( \
"move $sp, %1 ; jr %0" : : "r"(pc), "r"(sp) : "memory" )

1
include/elf.h
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@ -3329,6 +3329,7 @@ enum
#define R_LARCH_TLS_TPREL32 10
#define R_LARCH_TLS_TPREL64 11
#define R_LARCH_IRELATIVE 12
#define R_LARCH_TLS_DESC64 14
#define R_LARCH_MARK_LA 20
#define R_LARCH_MARK_PCREL 21
#define R_LARCH_SOP_PUSH_PCREL 22

37
src/ldso/loongarch64/tlsdesc.s Normal file
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@ -0,0 +1,37 @@
.text
.global __tlsdesc_static
.hidden __tlsdesc_static
.type __tlsdesc_static,%function
__tlsdesc_static:
ld.d $a0, $a0, 8
jr $ra
# size_t __tlsdesc_dynamic(size_t *a)
# {
# struct {size_t modidx,off;} *p = (void*)a[1];
# size_t *dtv = *(size_t**)(tp - 8);
# return dtv[p->modidx] + p->off - tp;
# }
.global __tlsdesc_dynamic
.hidden __tlsdesc_dynamic
.type __tlsdesc_dynamic,%function
__tlsdesc_dynamic:
addi.d $sp, $sp, -16
st.d $t1, $sp, 0
st.d $t2, $sp, 8
ld.d $t2, $tp, -8 # t2=dtv
ld.d $a0, $a0, 8 # a0=&{modidx,off}
ld.d $t1, $a0, 8 # t1=off
ld.d $a0, $a0, 0 # a0=modidx
slli.d $a0, $a0, 3 # a0=8*modidx
add.d $a0, $a0, $t2 # a0=dtv+8*modidx
ld.d $a0, $a0, 0 # a0=dtv[modidx]
add.d $a0, $a0, $t1 # a0=dtv[modidx]+off
sub.d $a0, $a0, $tp # a0=dtv[modidx]+off-tp
ld.d $t1, $sp, 0
ld.d $t2, $sp, 8
addi.d $sp, $sp, 16
jr $ra