runtime: cleanup ppc64le/linux library startup code

Fix the argument passing to runtime.newosproc0, the ABI0 argument
storing must account for the fixed frame size.

Cleanup the _rt0_ppc64le_linux_lib definition, the assembler
should not generate a stack frame.  And convert it to use the
new ABI wrappers.

Change-Id: Ibc0be8b37f6522900781a19980fa018dd89ba7b3
Reviewed-on: https://go-review.googlesource.com/c/go/+/479796
Reviewed-by: Than McIntosh <thanm@google.com>
Run-TryBot: Paul Murphy <murp@ibm.com>
Reviewed-by: David Chase <drchase@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>

diff --git a/src/runtime/rt0_linux_ppc64le.s b/src/runtime/rt0_linux_ppc64le.s
index 6aaec7ae8353815088ee53f95dabbbcc15846bb1..417ada21bf0cfaae92a789c09abef6bfe40e23c3 100644 (file)
--- a/src/runtime/rt0_linux_ppc64le.s
+++ b/src/runtime/rt0_linux_ppc64le.s
@@ -4,64 +4,22 @@
 
 #include "go_asm.h"
 #include "textflag.h"
+#include "asm_ppc64x.h"
+#include "cgo/abi_ppc64x.h"
 
 TEXT _rt0_ppc64le_linux(SB),NOSPLIT,$0
        XOR R0, R0        // Make sure R0 is zero before _main
        BR _main<>(SB)
 
-TEXT _rt0_ppc64le_linux_lib(SB),NOSPLIT,$-8
-       // Start with standard C stack frame layout and linkage.
-       MOVD    LR, R0
-       MOVD    R0, 16(R1) // Save LR in caller's frame.
-       MOVW    CR, R0     // Save CR in caller's frame
-       MOVD    R0, 8(R1)
-       MOVDU   R1, -320(R1) // Allocate frame.
-
-       // Preserve callee-save registers.
-       MOVD    R14, 24(R1)
-       MOVD    R15, 32(R1)
-       MOVD    R16, 40(R1)
-       MOVD    R17, 48(R1)
-       MOVD    R18, 56(R1)
-       MOVD    R19, 64(R1)
-       MOVD    R20, 72(R1)
-       MOVD    R21, 80(R1)
-       MOVD    R22, 88(R1)
-       MOVD    R23, 96(R1)
-       MOVD    R24, 104(R1)
-       MOVD    R25, 112(R1)
-       MOVD    R26, 120(R1)
-       MOVD    R27, 128(R1)
-       MOVD    R28, 136(R1)
-       MOVD    R29, 144(R1)
-       MOVD    g, 152(R1) // R30
-       MOVD    R31, 160(R1)
-       FMOVD   F14, 168(R1)
-       FMOVD   F15, 176(R1)
-       FMOVD   F16, 184(R1)
-       FMOVD   F17, 192(R1)
-       FMOVD   F18, 200(R1)
-       FMOVD   F19, 208(R1)
-       FMOVD   F20, 216(R1)
-       FMOVD   F21, 224(R1)
-       FMOVD   F22, 232(R1)
-       FMOVD   F23, 240(R1)
-       FMOVD   F24, 248(R1)
-       FMOVD   F25, 256(R1)
-       FMOVD   F26, 264(R1)
-       FMOVD   F27, 272(R1)
-       FMOVD   F28, 280(R1)
-       FMOVD   F29, 288(R1)
-       FMOVD   F30, 296(R1)
-       FMOVD   F31, 304(R1)
+TEXT _rt0_ppc64le_linux_lib(SB),NOSPLIT|NOFRAME,$0
+       // This is called with ELFv2 calling conventions. Convert to Go.
+       // Allocate argument storage for call to newosproc0.
+       STACK_AND_SAVE_HOST_TO_GO_ABI(16)
 
        MOVD    R3, _rt0_ppc64le_linux_lib_argc<>(SB)
        MOVD    R4, _rt0_ppc64le_linux_lib_argv<>(SB)
 
        // Synchronous initialization.
-       MOVD    $runtime·reginit(SB), R12
-       MOVD    R12, CTR
-       BL      (CTR)
        MOVD    $runtime·libpreinit(SB), R12
        MOVD    R12, CTR
        BL      (CTR)
@@ -78,57 +36,16 @@ TEXT _rt0_ppc64le_linux_lib(SB),NOSPLIT,$-8
 
 nocgo:
        MOVD    $0x800000, R12                     // stacksize = 8192KB
-       MOVD    R12, 8(R1)
+       MOVD    R12, 8+FIXED_FRAME(R1)
        MOVD    $_rt0_ppc64le_linux_lib_go(SB), R12
-       MOVD    R12, 16(R1)
+       MOVD    R12, 16+FIXED_FRAME(R1)
        MOVD    $runtime·newosproc0(SB),R12
        MOVD    R12, CTR
        BL      (CTR)
 
 done:
-       // Restore saved registers.
-       MOVD    24(R1), R14
-       MOVD    32(R1), R15
-       MOVD    40(R1), R16
-       MOVD    48(R1), R17
-       MOVD    56(R1), R18
-       MOVD    64(R1), R19
-       MOVD    72(R1), R20
-       MOVD    80(R1), R21
-       MOVD    88(R1), R22
-       MOVD    96(R1), R23
-       MOVD    104(R1), R24
-       MOVD    112(R1), R25
-       MOVD    120(R1), R26
-       MOVD    128(R1), R27
-       MOVD    136(R1), R28
-       MOVD    144(R1), R29
-       MOVD    152(R1), g // R30
-       MOVD    160(R1), R31
-       FMOVD   168(R1), F14
-       FMOVD   176(R1), F15
-       FMOVD   184(R1), F16
-       FMOVD   192(R1), F17
-       FMOVD   200(R1), F18
-       FMOVD   208(R1), F19
-       FMOVD   216(R1), F20
-       FMOVD   224(R1), F21
-       FMOVD   232(R1), F22
-       FMOVD   240(R1), F23
-       FMOVD   248(R1), F24
-       FMOVD   256(R1), F25
-       FMOVD   264(R1), F26
-       FMOVD   272(R1), F27
-       FMOVD   280(R1), F28
-       FMOVD   288(R1), F29
-       FMOVD   296(R1), F30
-       FMOVD   304(R1), F31
-
-       ADD     $320, R1
-       MOVD    8(R1), R0
-       MOVFL   R0, $0xff
-       MOVD    16(R1), R0
-       MOVD    R0, LR
+       // Restore and return to ELFv2 caller.
+       UNSTACK_AND_RESTORE_GO_TO_HOST_ABI(16)
        RET
 
 TEXT _rt0_ppc64le_linux_lib_go(SB),NOSPLIT,$0