diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/s390/mmap.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/s390/mmap.S | 50 |
1 files changed, 31 insertions, 19 deletions
diff --git a/sysdeps/unix/sysv/linux/s390/mmap.S b/sysdeps/unix/sysv/linux/s390/mmap.S index 0ba58ccf82..f9650e9f03 100644 --- a/sysdeps/unix/sysv/linux/s390/mmap.S +++ b/sysdeps/unix/sysv/linux/s390/mmap.S @@ -19,33 +19,45 @@ #include <sysdep.h> - .text +#define EINVAL 22 + .text ENTRY(__mmap) /* Save registers and setup stack frame. */ stm %r6,%r15,24(%r15) lr %r1,%r15 - l %r0,4(0,%r15) /* load eos */ ahi %r15,-120 /* buy stack space */ - st %r1,0(0,%r15) /* store back chain */ - st %r0,4(0,%r15) /* store eos */ + st %r1,0(%r15) /* store back chain */ - /* Store parameters on stack, because old_mmap - * takes only one parameter: a pointer to the parameter area + /* Store parameters on stack, because old_mmap/mmap2 + * take only one parameter: a pointer to the parameter area */ - mvc 0x74(4,%r15),216(%r15) /* move 'offset' */ - st %r6,0x70(0,%r15) /* store 'fd' */ - st %r5,0x6C(0,%r15) /* store 'flags' */ - st %r4,0x68(0,%r15) /* store 'prot' */ - st %r3,0x64(0,%r15) /* store 'length' */ - st %r2,0x60(0,%r15) /* store 'start' */ - - la %r2,0x60(0,%r15) /* load address of parameter list */ - /* Do the system call trap. */ - svc SYS_ify(mmap) - - l %r15,0(0,%r15) /* load back chain */ - lm %r6,%r15,24(%r15) /* load registers */ + st %r6,0x70(%r15) /* Store 'fd'. */ + st %r5,0x6C(%r15) /* Store 'flags'. */ + st %r4,0x68(%r15) /* Store 'prot'. */ + st %r3,0x64(%r15) /* Store 'length'. */ + st %r2,0x60(%r15) /* Store 'start'. */ + l %r1,216(%r15) /* Load offset. */ + +#ifdef __ASSUME_MMAP2_SYSCALL + /* I don't think it is worthwhile trying to use mmap2 whenever + * it is available. Only use it when we are sure the syscall + * exists. */ + tml %r1,0x0fff /* Offset page aligned ? */ + lhi %r2,-EINVAL + jnz 1f /* No -> EINVAL. */ + srl %r1,12 /* mmap2 takes the offset in pages. */ + st %r1,0x74(%r15) /* Store page offset. */ + la %r2,0x60(%r15) /* Load address of parameter list. */ + svc SYS_ify(mmap2) /* Do the system call trap. */ +#else + st %r1,0x74(%r15) /* Store offset unmodified. */ + la %r2,0x60(%r15) /* Load address of parameter list. */ + svc SYS_ify(mmap) /* Do the system call trap. */ +#endif + +1: l %r15,0(%r15) /* Load back chain. */ + lm %r6,%r15,24(%r15) /* Load registers. */ /* check gpr 2 for error */ lhi %r0,-4096 |