diff options
Diffstat (limited to 'c/src/lib/libbsp/m32r/m32rsim/console/trap0.S')
| -rw-r--r-- | c/src/lib/libbsp/m32r/m32rsim/console/trap0.S | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/m32r/m32rsim/console/trap0.S b/c/src/lib/libbsp/m32r/m32rsim/console/trap0.S new file mode 100644 index 0000000000..04efa13bab --- /dev/null +++ b/c/src/lib/libbsp/m32r/m32rsim/console/trap0.S @@ -0,0 +1,16 @@ +; Trap 0 handler (syscall interface). +; +; The trap handler returns the result in r0 and the error code (errno value) +; in r2. r1 is reserved in case an 8 byte quantity ever needs to be +; returned in registers. + + .text + .global __trap0 +__trap0: + trap #0 ; trap 0 returns result in r0, error code in r2 + cmpui r2,#1 ; is error code zero? + bc .Lret ; yes, skip setting errno + ld r4,@(sp) ; no, set errno + st r2,@r4 +.Lret: + jmp lr ; return to caller |