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Thu Mar 22 14:57:00 2000 Fernando Nasser <fnasser@redhat.com>

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* libc/sys/arm/syscalls.c (do_AngelSWI): Prevent registers with valid
	information to be clobbered by an Angel C library support syscall.
This commit is contained in:
Fernando Nasser 2000-03-23 20:19:13 +00:00
parent b8ec20c809
commit 7684ddaf52
2 changed files with 11 additions and 1 deletions
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5
newlib/ChangeLog
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@ -1,3 +1,8 @@
Thu Mar 22 14:57:00 2000 Fernando Nasser <fnasser@redhat.com>
* libc/sys/arm/syscalls.c (do_AngelSWI): Prevent registers with valid
information to be clobbered by an Angel C library support syscall.
Tue Mar 21 19:08:00 2000 Jeff Johnston <jjohnstn@cygnus.com>
* libc/stdlib/envlock.c: Fixed comment typo.

7
newlib/libc/sys/arm/syscalls.c
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@ -103,8 +103,13 @@ do_AngelSWI (int reason, void * arg)
asm volatile ("mov r0, %1; mov r1, %2; swi %a3; mov %0, r0"
: "=r" (value) /* Outputs */
: "r" (reason), "r" (arg), "i" (AngelSWI) /* Inputs */
: "r0", "r1", "lr"
: "r0", "r1", "r2", "r3", "ip", "lr", "memory"
/* Clobbers r0 and r1, and lr if in supervisor mode */);
/* Accordingly to page 13-77 of ARM DUI 0040D other registers
can also be clobbered. Some memory positions may also be
changed by a system call, so they should not be kept in
registers. Note: we are assuming the manual is right and
Angel is respecting the APCS */
return value;
}
#endif /* ARM_RDI_MONITOR */