diff options
Diffstat (limited to 'src/runtime/asm_ppc64x.s')
| -rw-r--r-- | src/runtime/asm_ppc64x.s | 41 |
1 files changed, 21 insertions, 20 deletions
diff --git a/src/runtime/asm_ppc64x.s b/src/runtime/asm_ppc64x.s index 11d2f2f51a..23387a2165 100644 --- a/src/runtime/asm_ppc64x.s +++ b/src/runtime/asm_ppc64x.s @@ -916,23 +916,23 @@ TEXT ·checkASM(SB),NOSPLIT,$0-1 // - R20 is the destination of the write // - R21 is the value being written at R20. // It clobbers condition codes. -// It does not clobber R0 through R15, +// It does not clobber R0 through R17 (except special registers), // but may clobber any other register, *including* R31. TEXT runtime·gcWriteBarrier(SB),NOSPLIT,$112 // The standard prologue clobbers R31. - // We use R16 and R17 as scratch registers. - MOVD g_m(g), R16 - MOVD m_p(R16), R16 - MOVD (p_wbBuf+wbBuf_next)(R16), R17 + // We use R18 and R19 as scratch registers. + MOVD g_m(g), R18 + MOVD m_p(R18), R18 + MOVD (p_wbBuf+wbBuf_next)(R18), R19 // Increment wbBuf.next position. - ADD $16, R17 - MOVD R17, (p_wbBuf+wbBuf_next)(R16) - MOVD (p_wbBuf+wbBuf_end)(R16), R16 - CMP R16, R17 + ADD $16, R19 + MOVD R19, (p_wbBuf+wbBuf_next)(R18) + MOVD (p_wbBuf+wbBuf_end)(R18), R18 + CMP R18, R19 // Record the write. - MOVD R21, -16(R17) // Record value - MOVD (R20), R16 // TODO: This turns bad writes into bad reads. - MOVD R16, -8(R17) // Record *slot + MOVD R21, -16(R19) // Record value + MOVD (R20), R18 // TODO: This turns bad writes into bad reads. + MOVD R18, -8(R19) // Record *slot // Is the buffer full? (flags set in CMP above) BEQ flush ret: @@ -956,11 +956,12 @@ flush: MOVD R8, (FIXED_FRAME+56)(R1) MOVD R9, (FIXED_FRAME+64)(R1) MOVD R10, (FIXED_FRAME+72)(R1) - MOVD R11, (FIXED_FRAME+80)(R1) - MOVD R12, (FIXED_FRAME+88)(R1) + // R11, R12 may be clobbered by external-linker-inserted trampoline // R13 is REGTLS - MOVD R14, (FIXED_FRAME+96)(R1) - MOVD R15, (FIXED_FRAME+104)(R1) + MOVD R14, (FIXED_FRAME+80)(R1) + MOVD R15, (FIXED_FRAME+88)(R1) + MOVD R16, (FIXED_FRAME+96)(R1) + MOVD R17, (FIXED_FRAME+104)(R1) // This takes arguments R20 and R21. CALL runtime·wbBufFlush(SB) @@ -975,10 +976,10 @@ flush: MOVD (FIXED_FRAME+56)(R1), R8 MOVD (FIXED_FRAME+64)(R1), R9 MOVD (FIXED_FRAME+72)(R1), R10 - MOVD (FIXED_FRAME+80)(R1), R11 - MOVD (FIXED_FRAME+88)(R1), R12 - MOVD (FIXED_FRAME+96)(R1), R14 - MOVD (FIXED_FRAME+104)(R1), R15 + MOVD (FIXED_FRAME+80)(R1), R14 + MOVD (FIXED_FRAME+88)(R1), R15 + MOVD (FIXED_FRAME+96)(R1), R16 + MOVD (FIXED_FRAME+104)(R1), R17 JMP ret // Note: these functions use a special calling convention to save generated code space. |