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runtime: avoid using address as constant in amd64 assembly

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This allows changing the addressing mode for constant
global addresses to use pc-relative addressing.

LGTM=rminnich, iant
R=golang-codereviews, rminnich, iant
CC=golang-codereviews
https://golang.org/cl/129830043
This commit is contained in:
Russ Cox 2014-08-12 19:51:20 -04:00
parent b049dc3074
commit 9aa1e9afda
1 changed files with 10 additions and 5 deletions
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15
src/pkg/runtime/asm_amd64.s
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@ -92,7 +92,8 @@ ok:
CALL runtime·schedinit(SB)
// create a new goroutine to start program
PUSHQ $runtime·main·f(SB) // entry
MOVQ $runtime·main·f(SB), BP // entry
PUSHQ BP
PUSHQ $0 // arg size
ARGSIZE(16)
CALL runtime·newproc(SB)
@ -209,7 +210,8 @@ TEXT runtime·onM(SB), NOSPLIT, $0-8
// save our state in g->sched. Pretend to
// be switchtoM if the G stack is scanned.
MOVQ $runtime·switchtoM(SB), (g_sched+gobuf_pc)(AX)
MOVQ $runtime·switchtoM(SB), BP
MOVQ BP, (g_sched+gobuf_pc)(AX)
MOVQ SP, (g_sched+gobuf_sp)(AX)
MOVQ AX, (g_sched+gobuf_g)(AX)
@ -302,7 +304,8 @@ TEXT runtime·newstackcall(SB), NOSPLIT, $0-20
// Save our own state as the PC and SP to restore
// if this goroutine needs to be restarted.
MOVQ $runtime·newstackcall(SB), (g_sched+gobuf_pc)(AX)
MOVQ $runtime·newstackcall(SB), BP
MOVQ BP, (g_sched+gobuf_pc)(AX)
MOVQ SP, (g_sched+gobuf_sp)(AX)
// Set up morestack arguments to call f on a new stack.
@ -1002,7 +1005,8 @@ aessmall:
// a page boundary, so we can load it directly.
MOVOU (AX), X1
ADDQ CX, CX
PAND masks<>(SB)(CX*8), X1
MOVQ $masks<>(SB), BP
PAND (BP)(CX*8), X1
JMP partial
highpartial:
// address ends in 1111xxxx. Might be up against
@ -1010,7 +1014,8 @@ highpartial:
// Then shift bytes down using pshufb.
MOVOU -16(AX)(CX*1), X1
ADDQ CX, CX
PSHUFB shifts<>(SB)(CX*8), X1
MOVQ $shifts<>(SB), BP
PSHUFB (BP)(CX*8), X1
partial:
// incorporate partial block into hash
AESENC X3, X0