From: William Tambe <tambewilliam@gmail.com>
To: gcc-help@gcc.gnu.org
Subject: Unconditional trap
Date: Sat, 12 Sep 2020 15:17:03 -0500 [thread overview]
Message-ID: <CAF8i9mMheO7_RpnuY=h+zMe1DTun90J=VuBjdnNdc0ozRSs2qA@mail.gmail.com> (raw)
I am currently using following for trap instruction:
(define_insn "trap"
[(trap_if (const_int 1) (const_int 0))]
""
"brk")
However it causes the compiler to generate a trap when address 0 is
used; in the example below, I have a function that prints characters
through the UART using address 0; but the resulting assembly generates
a function that traps instead.
#define UART_ADDR 0
void uart_print (char *s) {
while (*s) {
*(volatile char *)UART_ADDR = *s;
++s;
}
}
How can one implement unconditional trap ?
next reply other threads:[~2020-09-12 20:17 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-12 20:17 William Tambe [this message]
2020-09-12 20:26 ` Marc Glisse
2020-09-12 21:04 ` William Tambe
2020-09-12 21:24 ` Marc Glisse
2020-09-13 14:11 ` Segher Boessenkool
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