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The %pcrel_lo addend may causes the overflow, and need more than one
%pcrel_hi values. But there may be only one auipc, shared by those
%pcrel_lo with addends. However, the existing check method in the
riscv_resolve_pcrel_lo_relocs, may not be able to work for some
special/corner cases.
Consider the testcases pcrel-lo-addend-2b. Before applying this patch,
I can compile it successfully. But in fact the addend cause the value
of %pcrel_hi to be different. This patch try to check the value of
%pcrel_hi directly, to make sure it won't be changed. Otherwise, linker
will report the following errors,
(.text+0xa): dangerous relocation: %pcrel_lo overflow with an addend,
the value of %pcrel_hi is 0x1000 without any addend, but may be 0x2000
after adding the %pcrel_lo addend
The toolchain regressions, rv64gc-linux/rv64gc-elf/rv32gc-linux/rv32i-elf,
pass expectedly and looks fine.
bfd/
* elfnn-riscv.c (riscv_resolve_pcrel_lo_relocs): Check the values
of %pcrel_hi, before and after adding the addend. Make sure the
value won't be changed, otherwise, report dangerous error.
ld/
* testsuite/ld-riscv-elf/ld-riscv-elf.exp: Updated.
* testsuite/ld-riscv-elf/pcrel-lo-addend-2a.d: Renamed from
pcrel-lo-addend-2.
* testsuite/ld-riscv-elf/pcrel-lo-addend-2a.s: Likewise.
* testsuite/ld-riscv-elf/pcrel-lo-addend-2b.d: New testcase.
* testsuite/ld-riscv-elf/pcrel-lo-addend-2b.s: Likewise.
6 lines
311 B
Makefile
6 lines
311 B
Makefile
#name: %pcrel_lo overflow with an addend (2a)
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#source: pcrel-lo-addend-2a.s
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#as: -march=rv32ic
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#ld: -m[riscv_choose_ilp32_emul] --no-relax
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#error: .*dangerous relocation: %pcrel_lo overflow with an addend, the value of %pcrel_hi is 0x1000 without any addend, but may be 0x2000 after adding the %pcrel_lo addend
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