diff options
| author | Thomas Weißschuh <linux@weissschuh.net> | 2024-08-07 23:51:38 +0200 |
|---|---|---|
| committer | Thomas Weißschuh <linux@weissschuh.net> | 2024-08-10 17:08:10 +0200 |
| commit | 0daf8c86a45163f35b8d4f7795068c2511dd0ad9 (patch) | |
| tree | fae8d956a77e757ed32be1db9c5d1653ef5a5afe /tools | |
| parent | 55850eb4e582f0696f40b8315ac31a45d6a4955e (diff) | |
tools/nolibc: mips: load current function to $t9
The MIPS calling convention requires the address of the current function
to be available in $t9.
This was not done so far.
For GCC this seems to have worked, but when compiled with clang the
executable segfault instantly.
Properly load the address of _start_c() into $t9 before calling it.
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20240807-nolibc-llvm-v2-2-c20f2f5fc7c2@weissschuh.net
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/include/nolibc/arch-mips.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/tools/include/nolibc/arch-mips.h b/tools/include/nolibc/arch-mips.h index 62cc50ef3288..a2ee77ed2fbb 100644 --- a/tools/include/nolibc/arch-mips.h +++ b/tools/include/nolibc/arch-mips.h @@ -194,7 +194,9 @@ void __attribute__((weak, noreturn, optimize("Os", "omit-frame-pointer"))) __no_ "li $t0, -8\n" "and $sp, $sp, $t0\n" /* $sp must be 8-byte aligned */ "addiu $sp, $sp, -16\n" /* the callee expects to save a0..a3 there */ - "jal _start_c\n" /* transfer to c runtime */ + "lui $t9, %hi(_start_c)\n" /* ABI requires current function address in $t9 */ + "ori $t9, %lo(_start_c)\n" + "jalr $t9\n" /* transfer to c runtime */ " nop\n" /* delayed slot */ ".set pop\n" ); |