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tools/nolibc: mips: load current function to $t9

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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>
This commit is contained in:
Thomas Weißschuh 2024-08-07 23:51:38 +02:00
parent 55850eb4e5
commit 0daf8c86a4
1 changed files with 3 additions and 1 deletions
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4
tools/include/nolibc/arch-mips.h
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@ -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"
);