for some instructions, MIPS r6 uses different encoding other than
the previous releases.
1. mips/n32.S disable .set mips4: since it casuses old insn encoding
is used.
https://github.com/libffi/libffi/pull/396 has been accepted as:
94c102aa69b04337f63498e0e6551fcdce549ae5
2. mips/ffi.c: the encoding for JR is hardcoded: we need to use
different value for r6 and pre-r6.
https://github.com/libffi/libffi/pull/401 has been accpeted as:
746dbe3a6a79a41931c03b51df2972be4d5e5028
libffi/
PR libffi/83636
* src/mips/n32.S: disable .set mips4
* src/mips/ffi.c: use different JR encoding for r6.
/* lui $12,high(codeloc) */
tramp[2] = 0x3c0c0000 | ((unsigned)codeloc >> 16);
/* jr $25 */
+#if !defined(__mips_isa_rev) || (__mips_isa_rev<6)
tramp[3] = 0x03200008;
+#else
+ tramp[3] = 0x03200009;
+#endif
/* ori $12,low(codeloc) */
tramp[4] = 0x358c0000 | ((unsigned)codeloc & 0xffff);
#else
/* ori $25,low(fn) */
tramp[10] = 0x37390000 | ((unsigned long)fn & 0xffff);
/* jr $25 */
+#if !defined(__mips_isa_rev) || (__mips_isa_rev<6)
tramp[11] = 0x03200008;
+#else
+ tramp[11] = 0x03200009;
+#endif
/* ori $12,low(codeloc) */
tramp[12] = 0x358c0000 | ((unsigned long)codeloc & 0xffff);
#ifdef __GNUC__
.abicalls
#endif
+#if !defined(__mips_isa_rev) || (__mips_isa_rev<6)
.set mips4
+#endif
.text
.align 2
.globl ffi_call_N32