diff options
Diffstat (limited to 'ldso/ldso/c6x/resolve.S')
-rw-r--r-- | ldso/ldso/c6x/resolve.S | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/ldso/ldso/c6x/resolve.S b/ldso/ldso/c6x/resolve.S new file mode 100644 index 000000000..ce3cbe793 --- /dev/null +++ b/ldso/ldso/c6x/resolve.S @@ -0,0 +1,68 @@ +;; +;; Copyright (C) 2010 Texas Instruments Incorporated +;; Mark Salter <msalter@redhat.com> +;; +;; Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. +;; + +;; The function below is tail-called by resolver stubs when a +;; lazily-bound function is called. It must preserve all +;; registers that could be used to pass arguments to the actual +;; function. + +;; _dl_linux_resolver() figures out where the jump symbol is +;; _really_ supposed to have jumped to and returns that to us. +;; Once we have that, we prepare to tail-call the actual +;; function, clean up after ourselves, restoring the original +;; arguments, then jump to the fixed up address. */ + +; resolver stub - called from PLT to resolve target address and update GOT +; +; B0 : reloc offset (bytes from DT_RELPLT) +; B1 : module pointer, loaded from GOT[1] +; DP : caller's DP +; A4,B4, etc: callee's arguments +; B3 : return address + + .text + .align 5 + .global _dl_linux_resolve +_dl_linux_resolve: + stw .d2t2 B14, *B15--[2] + stdw .d2t1 A15:A14, *B15-- + stdw .d2t2 B13:B12, *B15-- + stdw .d2t1 A13:A12, *B15-- + stdw .d2t2 B11:B10, *B15-- + stdw .d2t1 A11:A10, *B15-- + stdw .d2t2 B9:B8, *B15-- + stdw .d2t1 A9:A8, *B15-- + stdw .d2t2 B7:B6, *B15-- + stdw .d2t1 A7:A6, *B15-- + stdw .d2t2 B5:B4, *B15-- + stdw .d2t1 A5:A4, *B15-- + stdw .d2t2 B3:B2, *B15-- + stdw .d2t1 A3:A2, *B15-- + + ; call lookup routine + MV .S1X B1, A4 ; arg 1: module id +|| MV .S2 B0,B4 ; arg 2: reloc offset + CALLP .S2 _dl_linux_resolver, B3 ; returns &f in A4 + MV .S2X A4,B0 ; &f + + lddw .d2t1 *++B15, A3:A2 + lddw .d2t2 *++B15, B3:B2 + lddw .d2t1 *++B15, A5:A4 + lddw .d2t2 *++B15, B5:B4 + lddw .d2t1 *++B15, A7:A6 + lddw .d2t2 *++B15, B7:B6 + lddw .d2t1 *++B15, A9:A8 + lddw .d2t2 *++B15, B9:B8 + lddw .d2t1 *++B15, A11:A10 + lddw .d2t2 *++B15, B11:B10 + lddw .d2t1 *++B15, A13:A12 + lddw .d2t2 *++B15, B13:B12 + lddw .d2t1 *++B15, A15:A14 + ldw .d2t2 *++B15[2], B14 + + B .S2 B0 ; tail-call f + NOP 5 |