https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103525
Nelson Chu <nelsonc1225 at sourceware dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |nelsonc1225 at sourceware dot
org
--- Comment #2 from Nelson Chu <nelsonc1225 at sourceware dot org> ---
I think this should be hard to fix in binutils, since the debug info looks
wrong in the generated assembly code. I notice that there is a similar pr as
follows,
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98776
And here should be one of the solution of x86,
https://gcc.gnu.org/git/gitweb.cgi?p=gcc.git;h=3dcea658c9e2ac84
The patchable area should be placed before both .cfi_startproc and ENDBR. For
example,
$ cat tmp.c
void main ()
{}
$ riscv64-unknown-linux-gnu-gcc -fpatchable-function-entry=8,3 -S -g tmp.c
.text
.Ltext0:
.cfi_sections .debug_frame
.file 0 "/home/nelsonc" "tmp.c"
.align 1
.globl main
.section __patchable_function_entries,"awo",@progbits,main
.align 3
.8byte .LPFE1
.text
.LPFE1:
nop
nop
nop
.type main, @function
main:
<------ I think the .LFB0 ~ .cfi_startproc should be moved here ---------
nop
nop
nop
nop
nop
.LFB0:
.file 1 "tmp.c"
.loc 1 2 1
.cfi_startproc
addi sp,sp,-16
If I move the patchable area forward, then the DW_AT_low_pc looks correct.
