author | Shawn Walker-Salas <shawn.walker@oracle.com> |
Thu, 21 Jan 2016 09:20:59 -0800 | |
changeset 5331 | 9c955076ffe3 |
permissions | -rw-r--r-- |
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From 6a18122614608c597511c2cc188ef771e393f1fb Mon Sep 17 00:00:00 2001 |
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From: David Crawshaw <[email protected]> |
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Date: Tue, 15 Sep 2015 13:40:24 -0400 |
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Subject: [PATCH 35/63] [release-branch.go1.5] runtime: preserve R11 in |
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darwin/arm entrypoint |
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The _rt0_arm_darwin_lib entrypoint has to conform to the darwin ARMv7 |
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calling convention, which requires functions to preserve the value of |
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R11. Go uses R11 as the liblink REGTMP register, so save it manually. |
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Also avoid using R4, which is also callee-save. |
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Fixes #12590 |
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Change-Id: I9c3b374e330f81ff8fc9c01fa20505a33ddcf39a |
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Reviewed-on: https://go-review.googlesource.com/14603 |
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Reviewed-by: Ian Lance Taylor <[email protected]> |
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Reviewed-on: https://go-review.googlesource.com/16968 |
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Run-TryBot: Austin Clements <[email protected]> |
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Reviewed-by: Russ Cox <[email protected]> |
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--- |
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src/runtime/rt0_darwin_arm.s | 29 ++++++++++++++++++----------- |
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1 file changed, 18 insertions(+), 11 deletions(-) |
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diff --git a/src/runtime/rt0_darwin_arm.s b/src/runtime/rt0_darwin_arm.s |
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index 95a2b17..d609850 100644 |
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--- a/src/runtime/rt0_darwin_arm.s |
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+++ b/src/runtime/rt0_darwin_arm.s |
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@@ -16,27 +16,34 @@ TEXT _rt0_arm_darwin(SB),7,$-4 |
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// |
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// Note that all currently shipping darwin/arm platforms require |
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// cgo and do not support c-shared. |
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-TEXT _rt0_arm_darwin_lib(SB),NOSPLIT,$12 |
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+TEXT _rt0_arm_darwin_lib(SB),NOSPLIT,$0 |
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+ // R11 is REGTMP, reserved for liblink. It is used below to |
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+ // move R0/R1 into globals. However in the darwin ARMv7 calling |
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+ // convention, it is a callee-saved register. So we save it to a |
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+ // temporary register. |
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+ MOVW R11, R2 |
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MOVW R0, _rt0_arm_darwin_lib_argc<>(SB) |
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MOVW R1, _rt0_arm_darwin_lib_argv<>(SB) |
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// Create a new thread to do the runtime initialization and return. |
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- MOVW _cgo_sys_thread_create(SB), R4 |
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- CMP $0, R4 |
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+ MOVW _cgo_sys_thread_create(SB), R3 |
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+ CMP $0, R3 |
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B.EQ nocgo |
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MOVW $_rt0_arm_darwin_lib_go(SB), R0 |
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MOVW $0, R1 |
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- BL (R4) |
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+ MOVW R2, R11 |
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+ BL (R3) |
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RET |
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nocgo: |
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MOVW $0x400000, R0 |
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- MOVW $_rt0_arm_darwin_lib_go(SB), R1 |
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- MOVW $0, R2 |
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- MOVW R0, (R13) // stacksize |
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- MOVW R1, 4(R13) // fn |
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- MOVW R2, 8(R13) // fnarg |
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- MOVW $runtime·newosproc0(SB), R4 |
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- BL (R4) |
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+ MOVW R0, (R13) // stacksize |
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+ MOVW $_rt0_arm_darwin_lib_go(SB), R0 |
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+ MOVW R0, 4(R13) // fn |
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+ MOVW $0, R0 |
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+ MOVW R0, 8(R13) // fnarg |
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+ MOVW $runtime·newosproc0(SB), R3 |
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+ MOVW R2, R11 |
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+ BL (R3) |
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RET |
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TEXT _rt0_arm_darwin_lib_go(SB),NOSPLIT,$0 |
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-- |
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2.6.1 |
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