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35 lines
1.2 KiB
35 lines
1.2 KiB
2 years ago
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commit aa3a97496c82a8443039248ebee650322c9480f4
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Author: Aurelien Jarno <aurelien@aurel32.net>
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Date: Thu Dec 16 00:06:28 2021 +0100
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riscv: align stack before calling _dl_init [BZ #28703]
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Align the stack pointer to 128 bits during the call to _dl_init() as
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specified by the RISC-V ABI [1]. This fixes the elf/tst-align2 test.
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Fixes bug 28703.
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[1] https://github.com/riscv-non-isa/riscv-elf-psabi-doc
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(cherry picked from commit 225da459cebef1037dcd78b56471edc0721e1c41)
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diff --git a/sysdeps/riscv/dl-machine.h b/sysdeps/riscv/dl-machine.h
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index aedf69fcdd8aff50..951268923da26a37 100644
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--- a/sysdeps/riscv/dl-machine.h
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+++ b/sysdeps/riscv/dl-machine.h
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@@ -127,8 +127,14 @@ elf_machine_load_address (void)
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sll a3, a1, " STRINGXP (PTRLOG) "\n\
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add a3, a3, a2\n\
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add a3, a3, " STRINGXP (SZREG) "\n\
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+ # Stash the stack pointer in s1.\n\
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+ mv s1, sp\n\
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+ # Align stack to 128 bits for the _dl_init call.\n\
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+ andi sp, sp,-16\n\
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# Call the function to run the initializers.\n\
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jal _dl_init\n\
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+ # Restore the stack pointer for _start.\n\
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+ mv sp, s1\n\
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# Pass our finalizer function to _start.\n\
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lla a0, _dl_fini\n\
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# Jump to the user entry point.\n\
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