justin/jsix_import
1
0
Fork 0
Code Issues 1 Pull Requests Actions Packages Projects Releases Wiki Activity

[kernel] Hide kernel symbols by default

Browse Source 
Using `-fvisibility=hidden` when building the kernel, and then
`--discard-all` when stripping it, we shave almost 100KiB off of the
resulting ELF file.

Also dropped some unused symbols from the linker script, and rearranged
the sections so that the file is able to be mapped directly into memory
instead of having each section copied.
This commit is contained in:
Justin C. Miller
2023-01-29 19:36:20 -08:00
parent e2e1696b7e
commit 5ea5978ee8
17 changed files with 126 additions and 120 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
src/kernel/syscall.s
View File

@@ -22,7 +22,7 @@ extern syscall_registry
extern syscall_invalid
global syscall_handler_prelude:function (syscall_handler_prelude.end - syscall_handler_prelude)
global syscall_handler_prelude: function hidden (syscall_handler_prelude.end - syscall_handler_prelude)
syscall_handler_prelude:
push rbp ; Never executed, fake function prelude
mov rbp, rsp ; to calm down gdb
@@ -77,7 +77,7 @@ syscall_handler_prelude:
call syscall_invalid
.end:
global kernel_to_user_trampoline:function (kernel_to_user_trampoline.end - kernel_to_user_trampoline)
global kernel_to_user_trampoline: function hidden (kernel_to_user_trampoline.end - kernel_to_user_trampoline)
kernel_to_user_trampoline:
pop r15
pop r14
@@ -98,7 +98,7 @@ kernel_to_user_trampoline:
o64 sysret
.end:
global syscall_enable:function (syscall_enable.end - syscall_enable)
global syscall_enable: function hidden (syscall_enable.end - syscall_enable)
syscall_enable:
push rbp
mov rbp, rsp