https://bugs.llvm.org/show_bug.cgi?id=46112
Bug ID: 46112
Summary: RISC-V binary does not respect page alignment
Product: lld
Version: unspecified
Hardware: Other
OS: other
Status: NEW
Severity: normal
Priority: P
Component: ELF
Assignee: unassignedb...@nondot.org
Reporter: xxue...@gmail.com
CC: llvm-bugs@lists.llvm.org, smithp...@googlemail.com
A sample code to reproduce this bug can be found at here:
https://gist.github.com/xxuejie/2825d4d0526c09f742d1ec4491deeaff, it just
contains some sillylogic so as to make sure the binary contains an executable
section, a writable section and a readable section.
First, let's compile the code:
clang --target=riscv64 -mno-relax -c -o test.o test.c
Then let's try link the code(I'm testing this on Linux but I would assume the
same bug applies elsewhere):
ld.lld test.o -o test
If we check the ELF generated here, it contains the following sections:
LOAD 0x0000000000000000 0x0000000000010000 0x0000000000010000
0x00000000000001d8 0x00000000000001d8 R 0x1000
LOAD 0x00000000000001d8 0x00000000000111d8 0x00000000000111d8
0x000000000000011e 0x000000000000011e R E 0x1000
LOAD 0x00000000000002f8 0x00000000000122f8 0x00000000000122f8
0x0000000000000000 0x0000000000000004 RW 0x1000
We can see that latter sections start at some offset in the designated pages,
not the beginning of the page. This result won't change if we use --no-nmagic
which I suppose should fix the problem. I tried both LLVM 10 and the latest git
HEAD, they both have this behavior.
So am I understanding page alignment rule wrong here? Or is there anyway we can
make sure in each section, the generated code starts from the beginning of the
page?
Many thanks for the help
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