diff options
Diffstat (limited to 'src/runtime/rt0_darwin_arm.s')
| -rw-r--r-- | src/runtime/rt0_darwin_arm.s | 28 |
1 files changed, 19 insertions, 9 deletions
diff --git a/src/runtime/rt0_darwin_arm.s b/src/runtime/rt0_darwin_arm.s index cbbea80ff8..59733d3ff6 100644 --- a/src/runtime/rt0_darwin_arm.s +++ b/src/runtime/rt0_darwin_arm.s @@ -16,12 +16,15 @@ TEXT _rt0_arm_darwin(SB),7,$-4 // // Note that all currently shipping darwin/arm platforms require // cgo and do not support c-shared. -TEXT _rt0_arm_darwin_lib(SB),NOSPLIT,$0 - // R11 is REGTMP, reserved for liblink. It is used below to - // move R0/R1 into globals. However in the darwin ARMv7 calling - // convention, it is a callee-saved register. So we save it to a - // temporary register. - MOVW R11, R2 +TEXT _rt0_arm_darwin_lib(SB),NOSPLIT,$32 + // Preserve callee-save registers. + MOVW R4, 12(R13) + MOVW R5, 16(R13) + MOVW R6, 20(R13) + MOVW R7, 24(R13) + MOVW R8, 28(R13) + MOVW R11, 32(R13) + MOVW R0, _rt0_arm_darwin_lib_argc<>(SB) MOVW R1, _rt0_arm_darwin_lib_argv<>(SB) @@ -35,9 +38,8 @@ TEXT _rt0_arm_darwin_lib(SB),NOSPLIT,$0 B.EQ nocgo MOVW $_rt0_arm_darwin_lib_go(SB), R0 MOVW $0, R1 - MOVW R2, R11 BL (R3) - RET + B rr nocgo: MOVW $0x400000, R0 MOVW R0, (R13) // stacksize @@ -46,10 +48,18 @@ nocgo: MOVW $0, R0 MOVW R0, 8(R13) // fnarg MOVW $runtime·newosproc0(SB), R3 - MOVW R2, R11 BL (R3) +rr: + // Restore callee-save registers and return. + MOVW 12(R13), R4 + MOVW 16(R13), R5 + MOVW 20(R13), R6 + MOVW 24(R13), R7 + MOVW 28(R13), R8 + MOVW 32(R13), R11 RET + TEXT _rt0_arm_darwin_lib_go(SB),NOSPLIT,$0 MOVW _rt0_arm_darwin_lib_argc<>(SB), R0 MOVW _rt0_arm_darwin_lib_argv<>(SB), R1 |