From b679fb488a8c35e573d50f118a09f72c1f6289de Mon Sep 17 00:00:00 2001 From: Nelson Chu Date: Sat, 25 Mar 2023 08:41:12 +0800 Subject: RISC-V: Clarify link behaviors of R_RISCV_32/64 relocations with ABS symbol. There are two improvements, which are all referenced to aarch64, * R_RISCV_32 with non ABS symbol cannot be used under RV64 when making shard objects. * Don't need dynamic relocation for R_RISCV_32/64 under RV32/RV64 when making shared objects, if the referenced symbol is local ABS symbol. However, considering this link, https://github.com/riscv-non-isa/riscv-elf-psabi-doc/issues/341 Seems like we should makes all R_RISCV_32/64 relocs with ABS symbol that don't need any dynamic relocations when making the shared objects. But anyway, I just sync the current behavior as aarch64 ld, in case there are any unexpected behaviors happen. Passed the gcc/binutils regressions in riscv-gnu-toolchain. bfd/ * elfnn-riscv.c (riscv_elf_check_relocs): Only allow R_RISCV_32 with ABS symbol under RV64. (riscv_elf_relocate_section): R_RISCV_32/64 with local ABS symbol under RV32/RV64 doesn't need any dynamic relocation when making shared objects. I just make the implementations similar to other targets, so that will be more easy to mainatain. ld/ * testsuite/ld-riscv-elf/data-reloc*: New testcases. * testsuite/ld-riscv-elf/ld-riscv-elf.exp: Added new data-reloc* testcases, and need to make ifunc-seperate* testcases work for rv32. * testsuite/ld-riscv-elf/ifunc-seperate-caller-nonplt.s: Likewise. * testsuite/ld-riscv-elf/ifunc-seperate-caller-plt.s: Likewise. --- ld/testsuite/ld-riscv-elf/data-reloc-rv32-pic.d | 21 +++++++++++++++++++++ ld/testsuite/ld-riscv-elf/data-reloc-rv32-pie.d | 18 ++++++++++++++++++ .../ld-riscv-elf/data-reloc-rv32-symbolic.d | 21 +++++++++++++++++++++ .../ld-riscv-elf/data-reloc-rv64-abs32-pic.d | 13 +++++++++++++ .../ld-riscv-elf/data-reloc-rv64-addr32-pic.d | 4 ++++ ld/testsuite/ld-riscv-elf/data-reloc-rv64-pic.d | 21 +++++++++++++++++++++ ld/testsuite/ld-riscv-elf/data-reloc-rv64-pie.d | 21 +++++++++++++++++++++ .../ld-riscv-elf/data-reloc-rv64-symbolic.d | 21 +++++++++++++++++++++ .../ld-riscv-elf/data-reloc-rv64-undef32-pic.d | 4 ++++ ld/testsuite/ld-riscv-elf/data-reloc.s | 22 ++++++++++++++++++++++ .../ld-riscv-elf/ifunc-seperate-caller-nonplt.s | 2 +- .../ld-riscv-elf/ifunc-seperate-caller-plt.s | 2 +- ld/testsuite/ld-riscv-elf/ld-riscv-elf.exp | 15 +++++++++++++++ 13 files changed, 183 insertions(+), 2 deletions(-) create mode 100644 ld/testsuite/ld-riscv-elf/data-reloc-rv32-pic.d create mode 100644 ld/testsuite/ld-riscv-elf/data-reloc-rv32-pie.d create mode 100644 ld/testsuite/ld-riscv-elf/data-reloc-rv32-symbolic.d create mode 100644 ld/testsuite/ld-riscv-elf/data-reloc-rv64-abs32-pic.d create mode 100644 ld/testsuite/ld-riscv-elf/data-reloc-rv64-addr32-pic.d create mode 100644 ld/testsuite/ld-riscv-elf/data-reloc-rv64-pic.d create mode 100644 ld/testsuite/ld-riscv-elf/data-reloc-rv64-pie.d create mode 100644 ld/testsuite/ld-riscv-elf/data-reloc-rv64-symbolic.d create mode 100644 ld/testsuite/ld-riscv-elf/data-reloc-rv64-undef32-pic.d create mode 100644 ld/testsuite/ld-riscv-elf/data-reloc.s (limited to 'ld') diff --git a/ld/testsuite/ld-riscv-elf/data-reloc-rv32-pic.d b/ld/testsuite/ld-riscv-elf/data-reloc-rv32-pic.d new file mode 100644 index 0000000..13f34e0 --- /dev/null +++ b/ld/testsuite/ld-riscv-elf/data-reloc-rv32-pic.d @@ -0,0 +1,21 @@ +#source: data-reloc.s +#as: -march=rv32i -mabi=ilp32 -defsym __abs__=1 -defsym __addr__=1 -defsym __undef__=1 +#ld: -m[riscv_choose_ilp32_emul] -Ttext 0x8000 --defsym _start=0x0 --defsym abs=0x100 --defsym abs_local=0x200 -shared +#objdump: -dR + +.*:[ ]+file format .* + + +Disassembly of section .text: + +0+8000 : + 8000: 00000000 .word 0x00000000 + 8000: R_RISCV_32 addr_globl + +0+8004 : + ... + 8004: R_RISCV_RELATIVE \*ABS\*\+0x8004 + 8008: R_RISCV_32 abs + 800c: 00000200 .word 0x00000200 + 8010: 00000000 .word 0x00000000 + 8010: R_RISCV_32 undef diff --git a/ld/testsuite/ld-riscv-elf/data-reloc-rv32-pie.d b/ld/testsuite/ld-riscv-elf/data-reloc-rv32-pie.d new file mode 100644 index 0000000..1e8f35a --- /dev/null +++ b/ld/testsuite/ld-riscv-elf/data-reloc-rv32-pie.d @@ -0,0 +1,18 @@ +#source: data-reloc.s +#as: -march=rv32i -mabi=ilp32 -defsym __abs__=1 -defsym __addr__=1 +#ld: -m[riscv_choose_ilp32_emul] -Ttext 0x8000 --defsym _start=0x0 --defsym abs=0x100 --defsym abs_local=0x200 -pie +#objdump: -dR + +.*:[ ]+file format .* + +Disassembly of section .text: + +0+8000 : + 8000: 00000000 .word 0x00000000 + 8000: R_RISCV_RELATIVE \*ABS\*\+0x8000 + +0+8004 : + 8004: 00000000 .word 0x00000000 + 8004: R_RISCV_RELATIVE \*ABS\*\+0x8004 + 8008: 00000100 .word 0x00000100 + 800c: 00000200 .word 0x00000200 diff --git a/ld/testsuite/ld-riscv-elf/data-reloc-rv32-symbolic.d b/ld/testsuite/ld-riscv-elf/data-reloc-rv32-symbolic.d new file mode 100644 index 0000000..5c947e2 --- /dev/null +++ b/ld/testsuite/ld-riscv-elf/data-reloc-rv32-symbolic.d @@ -0,0 +1,21 @@ +#source: data-reloc.s +#as: -march=rv32i -mabi=ilp32 -defsym __abs__=1 -defsym __addr__=1 -defsym __undef__=1 +#ld: -m[riscv_choose_ilp32_emul] -Ttext 0x8000 --defsym _start=0x0 --defsym abs=0x100 --defsym abs_local=0x200 -shared -Bsymbolic +#objdump: -dR + +.*:[ ]+file format .* + + +Disassembly of section .text: + +0+8000 : + 8000: 00000000 .word 0x00000000 + 8000: R_RISCV_RELATIVE \*ABS\*\+0x8000 + +0+8004 : + ... + 8004: R_RISCV_RELATIVE \*ABS\*\+0x8004 + 8008: R_RISCV_RELATIVE \*ABS\*\+0x100 + 800c: 00000200 .word 0x00000200 + 8010: 00000000 .word 0x00000000 + 8010: R_RISCV_32 undef diff --git a/ld/testsuite/ld-riscv-elf/data-reloc-rv64-abs32-pic.d b/ld/testsuite/ld-riscv-elf/data-reloc-rv64-abs32-pic.d new file mode 100644 index 0000000..1d3686d --- /dev/null +++ b/ld/testsuite/ld-riscv-elf/data-reloc-rv64-abs32-pic.d @@ -0,0 +1,13 @@ +#source: data-reloc.s +#as: -march=rv64i -mabi=lp64 -defsym __abs__=1 +#ld: -m[riscv_choose_lp64_emul] -Ttext 0x8000 --defsym _start=0x0 --defsym abs=0x100 --defsym abs_local=0x200 -shared +#objdump: -dR + +.*:[ ]+file format .* + + +Disassembly of section .text: + +0+8000 <.text>: + 8000: 00000100 .word 0x00000100 + 8004: 00000200 .word 0x00000200 diff --git a/ld/testsuite/ld-riscv-elf/data-reloc-rv64-addr32-pic.d b/ld/testsuite/ld-riscv-elf/data-reloc-rv64-addr32-pic.d new file mode 100644 index 0000000..39b50e3 --- /dev/null +++ b/ld/testsuite/ld-riscv-elf/data-reloc-rv64-addr32-pic.d @@ -0,0 +1,4 @@ +#source: data-reloc.s +#as: -march=rv64i -mabi=lp64 -defsym __addr__=1 +#ld: -m[riscv_choose_lp64_emul] -Ttext 0x8000 --defsym _start=0x0 -shared +#error: .*relocation R_RISCV_32 against non-absolute symbol `addr_globl' can not be used in RV64 when making a shared object.* diff --git a/ld/testsuite/ld-riscv-elf/data-reloc-rv64-pic.d b/ld/testsuite/ld-riscv-elf/data-reloc-rv64-pic.d new file mode 100644 index 0000000..dab0ccc --- /dev/null +++ b/ld/testsuite/ld-riscv-elf/data-reloc-rv64-pic.d @@ -0,0 +1,21 @@ +#source: data-reloc.s +#as: -march=rv64i -mabi=lp64 -defsym __64_bit__=1 -defsym __abs__=1 -defsym __addr__=1 -defsym __undef__=1 +#ld: -m[riscv_choose_lp64_emul] -Ttext 0x8000 --defsym _start=0x0 --defsym abs=0x100 --defsym abs_local=0x200 -shared +#objdump: -dR + +.*:[ ]+file format .* + + +Disassembly of section .text: + +0+8000 : + ... + 8000: R_RISCV_64 addr_globl + +0+8008 : + ... + 8008: R_RISCV_RELATIVE \*ABS\*\+0x8008 + 8010: R_RISCV_64 abs + 8018: 00000200 .word 0x00000200 + ... + 8020: R_RISCV_64 undef diff --git a/ld/testsuite/ld-riscv-elf/data-reloc-rv64-pie.d b/ld/testsuite/ld-riscv-elf/data-reloc-rv64-pie.d new file mode 100644 index 0000000..fd6c470 --- /dev/null +++ b/ld/testsuite/ld-riscv-elf/data-reloc-rv64-pie.d @@ -0,0 +1,21 @@ +#source: data-reloc.s +#as: -march=rv64i -mabi=lp64 -defsym __64_bit__=1 -defsym __abs__=1 -defsym __addr__=1 +#ld: -m[riscv_choose_lp64_emul] -Ttext 0x8000 --defsym _start=0x0 --defsym abs=0x100 --defsym abs_local=0x200 -pie +#objdump: -dR + +.*:[ ]+file format .* + + +Disassembly of section .text: + +0+8000 : + ... + 8000: R_RISCV_RELATIVE \*ABS\*\+0x8000 + +0+8008 : + ... + 8008: R_RISCV_RELATIVE \*ABS\*\+0x8008 + 8010: 00000100 .word 0x00000100 + 8014: 00000000 .word 0x00000000 + 8018: 00000200 .word 0x00000200 + 801c: 00000000 .word 0x00000000 diff --git a/ld/testsuite/ld-riscv-elf/data-reloc-rv64-symbolic.d b/ld/testsuite/ld-riscv-elf/data-reloc-rv64-symbolic.d new file mode 100644 index 0000000..5d41f86 --- /dev/null +++ b/ld/testsuite/ld-riscv-elf/data-reloc-rv64-symbolic.d @@ -0,0 +1,21 @@ +#source: data-reloc.s +#as: -march=rv64i -mabi=lp64 -defsym __64_bit__=1 -defsym __abs__=1 -defsym __addr__=1 -defsym __undef__=1 +#ld: -m[riscv_choose_lp64_emul] -Ttext 0x8000 --defsym _start=0x0 --defsym abs=0x100 --defsym abs_local=0x200 -shared -Bsymbolic +#objdump: -dR + +.*:[ ]+file format .* + + +Disassembly of section .text: + +0+8000 : + ... + 8000: R_RISCV_RELATIVE \*ABS\*\+0x8000 + +0+8008 : + ... + 8008: R_RISCV_RELATIVE \*ABS\*\+0x8008 + 8010: R_RISCV_RELATIVE \*ABS\*\+0x100 + 8018: 00000200 .word 0x00000200 + ... + 8020: R_RISCV_64 undef diff --git a/ld/testsuite/ld-riscv-elf/data-reloc-rv64-undef32-pic.d b/ld/testsuite/ld-riscv-elf/data-reloc-rv64-undef32-pic.d new file mode 100644 index 0000000..e5de484 --- /dev/null +++ b/ld/testsuite/ld-riscv-elf/data-reloc-rv64-undef32-pic.d @@ -0,0 +1,4 @@ +#source: data-reloc.s +#as: -march=rv64i -mabi=lp64 -defsym __undef__=1 +#ld: -m[riscv_choose_lp64_emul] -Ttext 0x8000 --defsym _start=0x0 -shared +#error: .*relocation R_RISCV_32 against non-absolute symbol `undef' can not be used in RV64 when making a shared object.* diff --git a/ld/testsuite/ld-riscv-elf/data-reloc.s b/ld/testsuite/ld-riscv-elf/data-reloc.s new file mode 100644 index 0000000..3715150 --- /dev/null +++ b/ld/testsuite/ld-riscv-elf/data-reloc.s @@ -0,0 +1,22 @@ + .macro DATA symbol +.ifdef __64_bit__ + .quad \symbol +.else + .word \symbol +.endif + .endm +.ifdef __addr__ + .globl addr_globl +addr_globl: + DATA addr_globl +addr_local: + DATA addr_local +.endif +.ifdef __abs__ + .hidden abs_local + DATA abs + DATA abs_local +.endif +.ifdef __undef__ + DATA undef +.endif diff --git a/ld/testsuite/ld-riscv-elf/ifunc-seperate-caller-nonplt.s b/ld/testsuite/ld-riscv-elf/ifunc-seperate-caller-nonplt.s index 23c7254..df0d33b 100644 --- a/ld/testsuite/ld-riscv-elf/ifunc-seperate-caller-nonplt.s +++ b/ld/testsuite/ld-riscv-elf/ifunc-seperate-caller-nonplt.s @@ -20,4 +20,4 @@ main: .data foo_addr: - .long foo + .quad foo diff --git a/ld/testsuite/ld-riscv-elf/ifunc-seperate-caller-plt.s b/ld/testsuite/ld-riscv-elf/ifunc-seperate-caller-plt.s index 8aa6403..cc1608a 100644 --- a/ld/testsuite/ld-riscv-elf/ifunc-seperate-caller-plt.s +++ b/ld/testsuite/ld-riscv-elf/ifunc-seperate-caller-plt.s @@ -23,4 +23,4 @@ main: .data foo_addr: - .long foo + .quad foo diff --git a/ld/testsuite/ld-riscv-elf/ld-riscv-elf.exp b/ld/testsuite/ld-riscv-elf/ld-riscv-elf.exp index 5dd6144..1b2a5ce 100644 --- a/ld/testsuite/ld-riscv-elf/ld-riscv-elf.exp +++ b/ld/testsuite/ld-riscv-elf/ld-riscv-elf.exp @@ -217,6 +217,16 @@ if [istarget "riscv*-*-*"] { run_dump_test "shared-lib-nopic-03" run_dump_test "shared-lib-nopic-04" + run_dump_test "data-reloc-rv64-pic" + run_dump_test "data-reloc-rv64-pie" + run_dump_test "data-reloc-rv64-symbolic" + run_dump_test "data-reloc-rv32-pic" + run_dump_test "data-reloc-rv32-pie" + run_dump_test "data-reloc-rv32-symbolic" + run_dump_test "data-reloc-rv64-abs32-pic" + run_dump_test "data-reloc-rv64-addr32-pic" + run_dump_test "data-reloc-rv64-undef32-pic" + # IFUNC testcases. # Check IFUNC by single type relocs. run_dump_test_ifunc "ifunc-reloc-call-01" rv32 exe @@ -270,6 +280,11 @@ if [istarget "riscv*-*-*"] { run_dump_test_ifunc "ifunc-plt-got-overwrite" rv64 pie run_dump_test_ifunc "ifunc-plt-got-overwrite" rv64 pic + # TODO: Make the following tests work under RV32. + if [istarget "riscv32-*-*"] { + return + } + # Setup shared libraries. run_ld_link_tests { { "Build shared library for IFUNC non-PLT caller" -- cgit v1.1