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87383e408d
See http://lists.llvm.org/pipermail/llvm-dev/2020-April/140549.html For the record, GNU ld changed to 64k max page size in 2014 https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=7572ca8989ead4c3425a1500bc241eaaeffa2c89 "[RFC] ld/ARM: Increase maximum page size to 64kB" Android driver forced 4k page size in AArch64 (D55029) and ARM (D77746). A binary linked with max-page-size=4096 does not run on a system with a higher page size configured. There are some systems out there that do this and it leads to the binary getting `Killed!` by the kernel. In the non-linker-script cases, when linked with -z noseparate-code (default), the max-page-size increase should not cause any size difference. There may be some VMA usage differences, though. Reviewed By: psmith, MaskRay Differential Revision: https://reviews.llvm.org/D77330
67 lines
2.2 KiB
ArmAsm
67 lines
2.2 KiB
ArmAsm
// REQUIRES: arm
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// RUN: llvm-mc -filetype=obj -triple=armv7a-none-linux-gnueabi --arm-add-build-attributes %s -o %t
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// RUN: ld.lld %t --no-merge-exidx-entries -o %t2
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// RUN: llvm-objdump -s %t2 | FileCheck %s
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// RUN: ld.lld %t -o %t3
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// RUN: llvm-objdump -s %t3 | FileCheck %s --check-prefix=CHECK-MERGE
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/// The ARM.exidx section is a table of 8-byte entries of the form:
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/// | PREL31 Relocation to start of function | Unwinding information |
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/// The range of addresses covered by the table entry is terminated by the
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/// next table entry. This means that an executable section without a .ARM.exidx
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/// section does not terminate the range of addresses. To fix this the linker
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/// synthesises an EXIDX_CANTUNWIND entry for each section without a .ARM.exidx
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/// section.
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.syntax unified
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/// Expect inline unwind instructions
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.section .text.01, "ax", %progbits
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.global f1
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f1:
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.fnstart
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bx lr
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.save {r7, lr}
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.setfp r7, sp, #0
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.fnend
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/// Expect no unwind information from assembler. The linker must
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/// synthesise an EXIDX_CANTUNWIND entry to prevent an exception
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/// thrown through f2 from matching against the unwind instructions
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/// for f1.
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.section .text.02, "ax", %progbits
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.global f2
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f2:
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bx lr
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/// Expect 1 EXIDX_CANTUNWIND entry that can be merged into the linker
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/// generated EXIDX_CANTUNWIND as if the assembler had generated it.
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.section .text.03, "ax",%progbits
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.global f3
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f3:
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.fnstart
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bx lr
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.cantunwind
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.fnend
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/// Dummy implementation of personality routines to satisfy reference
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/// from exception tables, linker will generate EXIDX_CANTUNWIND.
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.section .text.__aeabi_unwind_cpp_pr0, "ax", %progbits
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.global __aeabi_unwind_cpp_pr0
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__aeabi_unwind_cpp_pr0:
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bx lr
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/// f1, f2
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// CHECK: 100d4 28000100 08849780 24000100 01000000
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/// f3, __aeabi_unwind_cpp_pr0
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// CHECK-NEXT: 100e4 20000100 01000000 1c000100 01000000
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/// sentinel
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// CHECK-NEXT: 100f4 18000100 01000000
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/// f1, (f2, f3, __aeabi_unwind_cpp_pr0)
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// CHECK-MERGE: 100d4 18000100 08849780 14000100 01000000
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/// sentinel
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// CHECK-MERGE-NEXT: 100e4 18000100 01000000
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