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| author | Max Filippov <jcmvbkbc@gmail.com> | 2015-09-16 01:49:49 +0300 |
|---|---|---|
| committer | Waldemar Brodkorb <wbx@openadk.org> | 2015-10-08 20:31:24 +0200 |
| commit | e78a0f58f23347c822c182d1c01f6eb9b9866d60 (patch) | |
| tree | 723cfbcd2411d889fb4956adb7f2d11a6d766050 /ldso/ldso/xtensa/resolve.S | |
| parent | 9fae2ad9937279c9f7f40975ac14cb7b57f4a36d (diff) | |
xtensa: support call0 ABI
Most changes are mechanical replacement of 'retw' instruction with
'abi_ret' macro, defined to 'retw' or 'ret' according to ABI.
Assembly code that makes calls is duplicated for call0 ABI with changed
register numbers for parameters/return value and call instruction.
'entry' instructions are replaced with 'abi_entry' macro.
More interesting changes:
- non-leaf assembly functions (e.g. _dl_tlsdesc_dynamic,
_dl_linux_resolve, SYSCALL_ERROR_HANDLER, PSEUDO) now need to preserve
registers around intermediate calls they make, use temporary stack
frame for that;
- setjmp/longjmp only need to save and restore return address, stack
pointer and callee-saved registers in the jmpbuf;
- __clone and syscall functions had hardcoded offsets to parameter
passed on stack, on call0 ABI they don't need stack frame, so the
offset is different. Replace these offsets with FRAMESIZE macro.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'ldso/ldso/xtensa/resolve.S')
| -rw-r--r-- | ldso/ldso/xtensa/resolve.S | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/ldso/ldso/xtensa/resolve.S b/ldso/ldso/xtensa/resolve.S index 8061af247..12a554de7 100644 --- a/ldso/ldso/xtensa/resolve.S +++ b/ldso/ldso/xtensa/resolve.S @@ -31,6 +31,7 @@ .global _dl_linux_resolve .type _dl_linux_resolve, @function _dl_linux_resolve: +#if defined(__XTENSA_WINDOWED_ABI__) /* Call the fixup function. */ movi a8, _dl_linux_resolver callx8 a8 @@ -47,4 +48,38 @@ _dl_linux_resolve: /* Jump to the next instruction past the ENTRY. */ addi a10, a10, 3 jx a10 +#elif defined(__XTENSA_CALL0_ABI__) + /* Reserve stack space and save incoming arguments. */ + addi a1, a1, -32 + s32i a0, a1, 0 + s32i a2, a1, 8 + s32i a3, a1, 12 + s32i a4, a1, 16 + s32i a5, a1, 20 + s32i a6, a1, 24 + s32i a7, a1, 28 + + /* Move arguments for the _dl_linux_resolver to proper registers. */ + mov a2, a10 + mov a3, a11 + /* Call the fixup function. */ + movi a0, _dl_linux_resolver + callx0 a0 + mov a10, a2 + + /* Restore incoming arguments from stack and deallocate reservation. */ + l32i a0, a1, 0 + l32i a2, a1, 8 + l32i a3, a1, 12 + l32i a4, a1, 16 + l32i a5, a1, 20 + l32i a6, a1, 24 + l32i a7, a1, 28 + addi a1, a1, 32 + + /* Jump to the target function. */ + jx a10 +#else +#error Unsupported Xtensa ABI +#endif .size _dl_linux_resolve, . - _dl_linux_resolve |