| Message ID | 20240807-nolibc-llvm-v2-2-c20f2f5fc7c2@weissschuh.net |
|---|---|
| State | Accepted |
| Commit | 0daf8c86a45163f35b8d4f7795068c2511dd0ad9 |
| Headers | show |
| Series | tools/nolibc: improve LLVM/clang support | expand |
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" );
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. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> --- tools/include/nolibc/arch-mips.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)