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libgloss: pru: Fix _open syscal arguments 

The _open() C function is declared as having variable arguments in
newlib, so second and third arguments are passed on stack. Add code to
move them into registers, since that's where the PRU simulator expects
them.

Issue was exposed by the GCC test gcc.c-torture/execute/fprintf-2.c,
which relies on tmpnam implementation to pass correct flags to _open.

Signed-off-by: Dimitar Dimitrov <dimitar@dinux.eu>
This commit is contained in:
Dimitar Dimitrov 2022-04-03 21:57:39 +03:00 committed by Corinna Vinschen
parent 23a3ec3392
commit 21f0edbf9f
1 changed files with 17 additions and 1 deletions
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18
libgloss/pru/syscalls.S
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@ -68,7 +68,6 @@ __SC_ret_skip_errno_set:
users use other methods for communicating with
the host - remoteproc, rpmsg, shared memory. */
SC _exit, SYS_exit
SC _open, SYS_open
SC _close, SYS_close
SC _read, SYS_read
SC _write, SYS_write
@ -77,3 +76,20 @@ __SC_ret_skip_errno_set:
SC _getpid, SYS_getpid
SC _kill, SYS_kill
SC _fstat, SYS_fstat
/* _open is special because it has VA declaration. */
.section .text._open, "ax"
.global _open
.type _open,@function
.func
_open:
/* Pop the second and third argument from stack, per VA ABI.
Thus simulator can get all arguments from registers
for any supported syscall. */
lbbo r16, sp, 4, 4
lbbo r15, sp, 0, 4
ldi r1, SYS_open
halt
jmp __SC_ret
.endfunc