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tools/nolibc: add auxiliary vector retrieval for mips
In the _start block we now iterate over envp to find the auxiliary vector after the NULL. The pointer is saved into an _auxv variable that is marked as weak so that it's accessible from multiple units. Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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@ -177,6 +177,7 @@ struct sys_stat_struct {
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})
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char **environ __attribute__((weak));
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const unsigned long *_auxv __attribute__((weak));
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/* startup code, note that it's called __start on MIPS */
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void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) __start(void)
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@ -196,6 +197,16 @@ void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) __start(void)
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"lui $a3, %hi(environ)\n" // load environ into a3 (hi)
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"addiu $a3, %lo(environ)\n" // load environ into a3 (lo)
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"sw $a2,($a3)\n" // store envp(a2) into environ
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"move $t0, $a2\n" // iterate t0 over envp, look for NULL
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"0:" // do {
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"lw $a3, ($t0)\n" // a3=*(t0);
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"bne $a3, $0, 0b\n" // } while (a3);
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"addiu $t0, $t0, 4\n" // delayed slot: t0+=4;
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"lui $a3, %hi(_auxv)\n" // load _auxv into a3 (hi)
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"addiu $a3, %lo(_auxv)\n" // load _auxv into a3 (lo)
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"sw $t0, ($a3)\n" // store t0 into _auxv
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"li $t0, -8\n"
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"and $sp, $sp, $t0\n" // sp must be 8-byte aligned
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"addiu $sp,$sp,-16\n" // the callee expects to save a0..a3 there!
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