If there was an error during syscall then after it's completion a3
register holds a non-zero value and v0 holds an actual error code which
should be saved in errno. This can be achieved by calling
__syscall_error with the value from v0 as a parameter. So this value
should be stored in a0, but the appropriate assembly instructions are
missing. Fixed this now by adding "move a0, v0".
I think it was once fixed by
58c5f8ba4cdf62342d05a546d15404cbbb3c4e07
but then something went wrong. Again...
Signed-off-by: Alexander Gordeev <lasaine@lvk.cs.msu.su>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
#ifdef __PIC__
#define PSEUDO(name, syscall_name, args) \
.align 2; \
- 99: la t9,__syscall_error; \
+ 99: move a0, v0; \
+ la t9,__syscall_error; \
jr t9; \
ENTRY(name) \
.set noreorder; \
#define PSEUDO(name, syscall_name, args) \
.set noreorder; \
.align 2; \
- 99: j __syscall_error; \
+ 99: move a0, v0; \
+ j __syscall_error; \
nop; \
ENTRY(name) \
.set noreorder; \
# undef PSEUDO
# define PSEUDO(name, syscall_name, args) \
.align 2; \
- 99: la t9,__syscall_error; \
+ 99: move a0, v0; \
+ la t9,__syscall_error; \
jr t9; \
ENTRY (name) \
.set noreorder; \
# ifdef __PIC__
# define PSEUDO_CPLOAD .cpload t9;
-# define PSEUDO_ERRJMP la t9, __syscall_error; jr t9;
+# define PSEUDO_ERRJMP move a0, v0; la t9, __syscall_error; jr t9;
# define PSEUDO_SAVEGP sw gp, 32(sp); cfi_rel_offset (gp, 32);
# define PSEUDO_LOADGP lw gp, 32(sp);
# else
# define PSEUDO_CPLOAD
-# define PSEUDO_ERRJMP j __syscall_error;
+# define PSEUDO_ERRJMP move a0, v0; j __syscall_error;
# define PSEUDO_SAVEGP
# define PSEUDO_LOADGP
# endif