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| author | mamonet <maamoun@DESKTOP-KU5PF0V.localdomain> | 2020-12-18 17:38:39 +0200 |
|---|---|---|
| committer | mamonet <maamoun@DESKTOP-KU5PF0V.localdomain> | 2020-12-18 17:42:14 +0200 |
| commit | 94a57e070a6160000a7d5f07ea632db5c8cdba21 (patch) | |
| tree | 2f902737f73c3a1c7c3ce63d388a5b70f8b384dc | |
| parent | 539efc9b997dfba757cacbbc512bc0a216ffe743 (diff) | |
| download | nettle-94a57e070a6160000a7d5f07ea632db5c8cdba21.tar.gz | |
[PowerPC64] Use 32-bit offset to load data
| -rw-r--r-- | powerpc64/README | 10 | ||||
| -rw-r--r-- | powerpc64/machine.m4 | 3 | ||||
| -rw-r--r-- | powerpc64/p7/chacha-4core.asm | 3 |
3 files changed, 10 insertions, 6 deletions
diff --git a/powerpc64/README b/powerpc64/README index 7301953b..9083d898 100644 --- a/powerpc64/README +++ b/powerpc64/README @@ -34,14 +34,16 @@ VR20:VR31 Nonvolatile (extended ABI mode) their values are preserved Addressing memory -There are many ways to reference data, in the sake of writing -position-independent code the current implementation uses GOT-indirect +There are many ways to reference data, to maintain support of +position-independent code the current implementations use GOT-indirect addressing (Accessing data through the global offset table): 1. Define data in .data section 2. Load the address of data into register from the global offset table - e.g. ld 7, my_var@got(2) + Use 32-bit offset (medium or large code model) to get maximum addressing + reach of 4 GB e.g. addis r7, r2, my_var@got@ha + ld r7, my_var@got@l(r7) 3. Use the address to load the value of data into register - e.g. ld 3, 0(7) + e.g. ld r3, 0(r7) Refer to [2] for more information about referencing data VSX instructions "lxvd2x/stxvd2x" are used to load and store data to diff --git a/powerpc64/machine.m4 b/powerpc64/machine.m4 index e2383201..187a49b8 100644 --- a/powerpc64/machine.m4 +++ b/powerpc64/machine.m4 @@ -34,7 +34,8 @@ C used to obtain the effective address of C DATA_SRC storage. C DATA_LOAD_VEC(VEC_DST, DATA_SRC, GPR) define(`DATA_LOAD_VEC', -`ld $3,$2@got(r2) +`addis $3,r2,$2@got@ha +ld $3,$2@got@l($3) lvx $1,0,$3') dnl Usage: r0 ... r31, cr0 ... cr7 diff --git a/powerpc64/p7/chacha-4core.asm b/powerpc64/p7/chacha-4core.asm index ed1445dd..e3870063 100644 --- a/powerpc64/p7/chacha-4core.asm +++ b/powerpc64/p7/chacha-4core.asm @@ -168,7 +168,8 @@ C Load state and splat vspltw v15, v12, 3 vspltw v12, v12, 0 - ld r9, .Lcnts@got(r2) + addis r9, r2, .Lcnts@got@ha + ld r9, .Lcnts@got@l(r9) lxvw4x VSR(T0), 0, r9 C increments vaddcuw T1, v12, T0 C compute carry-out vadduwm v12, v12, T0 C low adds |