* [PATCH v2] LoongArch: Adapt R_LARCH_{PCALA,GOT,TLS_IE,TLS_DESC}64_* handling per psABI v2.30
@ 2024-01-16 7:00 Xi Ruoyao
0 siblings, 0 replies; only message in thread
From: Xi Ruoyao @ 2024-01-16 7:00 UTC (permalink / raw)
To: binutils
Cc: liuzhensong, mengqinggang, i.swmail, maskray, hejinyang, cailulu,
chenglulu, xuchenghua, luweining, Xi Ruoyao
In LoongArch psABI v2.30, an offset (-8 for LO20 and -12 for HI12)
should be applied on PC for these reloc types to avoid wrong relocation
when the instruction sequence crosses a page boundary.
The lld linker has already adapted the change. Make it for the bfd
linker too.
Link: https://github.com/loongson/la-abi-specs/releases/v2.30
Link: https://github.com/loongson-community/discussions/issues/17
Link: https://github.com/llvm/llvm-project/pull/73387
Signed-off-by: Xi Ruoyao <xry111@xry111.site>
---
[v1] -> v2:
- Add parentheses around "pc" in RELOCATE_CALC_PC64_HI32 to fix FTBFS
without --disable-werror.
- Remove "-shared" from the test case.
[v1]:https://sourceware.org/pipermail/binutils/2024-January/131852.html
bfd/elfnn-loongarch.c | 31 +++++++++++--------
.../ld-loongarch-elf/ld-loongarch-elf.exp | 1 +
ld/testsuite/ld-loongarch-elf/pcala64.d | 15 +++++++++
ld/testsuite/ld-loongarch-elf/pcala64.s | 8 +++++
4 files changed, 42 insertions(+), 13 deletions(-)
create mode 100644 ld/testsuite/ld-loongarch-elf/pcala64.d
create mode 100644 ld/testsuite/ld-loongarch-elf/pcala64.s
diff --git a/bfd/elfnn-loongarch.c b/bfd/elfnn-loongarch.c
index 3858a3179fd..8103967269b 100644
--- a/bfd/elfnn-loongarch.c
+++ b/bfd/elfnn-loongarch.c
@@ -2529,7 +2529,7 @@ loongarch_reloc_is_fatal (struct bfd_link_info *info,
({ \
bfd_vma __lo = (relocation & (bfd_vma)0xfff); \
relocation = (relocation & ~(bfd_vma)0xfff) \
- - (pc & ~(bfd_vma)0xfff); \
+ - ((pc) & ~(bfd_vma)0xfff); \
if (__lo > 0x7ff) \
relocation += (0x1000 - 0x100000000); \
if (relocation & 0x80000000) \
@@ -3544,14 +3544,16 @@ loongarch_elf_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
}
break;
- case R_LARCH_PCALA64_LO20:
case R_LARCH_PCALA64_HI12:
+ pc -= 4;
+ /* Fall through. */
+ case R_LARCH_PCALA64_LO20:
if (h && h->plt.offset != MINUS_ONE)
relocation = sec_addr (plt) + h->plt.offset;
else
relocation += rel->r_addend;
- RELOCATE_CALC_PC64_HI32 (relocation, pc);
+ RELOCATE_CALC_PC64_HI32 (relocation, pc - 8);
break;
@@ -3678,9 +3680,10 @@ loongarch_elf_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
relocation = got_off + sec_addr (got);
}
- if (r_type == R_LARCH_GOT64_PC_HI12
- || r_type == R_LARCH_GOT64_PC_LO20)
- RELOCATE_CALC_PC64_HI32 (relocation, pc);
+ if (r_type == R_LARCH_GOT64_PC_HI12)
+ RELOCATE_CALC_PC64_HI32 (relocation, pc - 12);
+ else if (r_type == R_LARCH_GOT64_PC_LO20)
+ RELOCATE_CALC_PC64_HI32 (relocation, pc - 8);
break;
@@ -3881,13 +3884,14 @@ loongarch_elf_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
/* Use both TLS_GD and TLS_DESC. */
if ((tls_type & GOT_TLS_GD) && (tls_type & GOT_TLS_GDESC))
relocation += 2 * GOT_ENTRY_SIZE;
- }
- if (r_type == R_LARCH_TLS_DESC64_PC_LO20
- || r_type == R_LARCH_TLS_DESC64_PC_HI12)
- RELOCATE_CALC_PC64_HI32 (relocation, pc);
+ if (r_type == R_LARCH_TLS_DESC64_PC_LO20)
+ RELOCATE_CALC_PC64_HI32 (relocation, pc - 8);
+ else if (r_type == R_LARCH_TLS_DESC64_PC_HI12)
+ RELOCATE_CALC_PC64_HI32 (relocation, pc - 12);
break;
+ }
case R_LARCH_TLS_DESC_LD:
case R_LARCH_TLS_DESC_CALL:
@@ -3916,9 +3920,10 @@ loongarch_elf_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
else if (GOT_TLS_GD_ANY_P (tls_type) && (tls_type & GOT_TLS_IE))
relocation += 2 * GOT_ENTRY_SIZE;
- if (r_type == R_LARCH_TLS_IE64_PC_LO20
- || r_type == R_LARCH_TLS_IE64_PC_HI12)
- RELOCATE_CALC_PC64_HI32 (relocation, pc);
+ if (r_type == R_LARCH_TLS_IE64_PC_LO20)
+ RELOCATE_CALC_PC64_HI32 (relocation, pc - 8);
+ else if (r_type == R_LARCH_TLS_IE64_PC_HI12)
+ RELOCATE_CALC_PC64_HI32 (relocation, pc - 12);
break;
diff --git a/ld/testsuite/ld-loongarch-elf/ld-loongarch-elf.exp b/ld/testsuite/ld-loongarch-elf/ld-loongarch-elf.exp
index 6ab87163039..2ff06d62236 100644
--- a/ld/testsuite/ld-loongarch-elf/ld-loongarch-elf.exp
+++ b/ld/testsuite/ld-loongarch-elf/ld-loongarch-elf.exp
@@ -26,6 +26,7 @@ if [istarget "loongarch64-*-*"] {
run_dump_test "disas-jirl"
run_dump_test "local-ifunc-reloc"
run_dump_test "anno-sym"
+ run_dump_test "pcala64"
}
if [istarget "loongarch32-*-*"] {
diff --git a/ld/testsuite/ld-loongarch-elf/pcala64.d b/ld/testsuite/ld-loongarch-elf/pcala64.d
new file mode 100644
index 00000000000..e0e9819d387
--- /dev/null
+++ b/ld/testsuite/ld-loongarch-elf/pcala64.d
@@ -0,0 +1,15 @@
+#ld: -Ttext=0x180000ff8 -Tdata=0x1000000000
+#objdump: -d
+
+.*:[ ]+file format .*
+
+
+Disassembly of section .text:
+
+0000000180000ff8 <_start>:
+[ ]+180000ff8:[ ]+1b000004[ ]+pcalau12i[ ]+\$a0,[ ]+-524288
+[ ]+180000ffc:[ ]+02c0000c[ ]+li.d[ ]+\$t0,[ ]+0
+[ ]+180001000:[ ]+160001ec[ ]+lu32i.d[ ]+\$t0,[ ]+15
+[ ]+180001004:[ ]+0300018c[ ]+lu52i.d[ ]+\$t0,[ ]+\$t0,[ ]+0
+[ ]+180001008:[ ]+0010b084[ ]+add.d[ ]+\$a0,[ ]+\$a0,[ ]+\$t0
+[ ]+18000100c:[ ]+4c000020[ ]+ret
diff --git a/ld/testsuite/ld-loongarch-elf/pcala64.s b/ld/testsuite/ld-loongarch-elf/pcala64.s
new file mode 100644
index 00000000000..dfef0e2b7b7
--- /dev/null
+++ b/ld/testsuite/ld-loongarch-elf/pcala64.s
@@ -0,0 +1,8 @@
+.text
+.globl _start
+_start:
+ la.pcrel $a0, $t0, sym
+ jr $ra
+.data
+sym:
+ .dword 0
--
2.43.0
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2024-01-16 7:00 [PATCH v2] LoongArch: Adapt R_LARCH_{PCALA,GOT,TLS_IE,TLS_DESC}64_* handling per psABI v2.30 Xi Ruoyao
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