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MicroJIT: Use R9 in generated code for Ruby stack pointer

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This commit is contained in:
Alan Wu 2020-10-19 18:04:16 -04:00
parent 11c1daea17
commit 1ef2887bc1
1 changed files with 11 additions and 11 deletions
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22
ujit_compile.c
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@ -101,7 +101,7 @@ Get an operand for the adjusted stack pointer address
x86opnd_t ctx_sp_opnd(ctx_t* ctx, size_t n) x86opnd_t ctx_sp_opnd(ctx_t* ctx, size_t n)
{ {
int32_t offset = (ctx->stack_diff) * 8; int32_t offset = (ctx->stack_diff) * 8;
return mem_opnd(64, RSI, offset); return mem_opnd(64, R9, offset);
} }
/* /*
@ -114,7 +114,7 @@ x86opnd_t ctx_stack_push(ctx_t* ctx, size_t n)
// SP points just above the topmost value // SP points just above the topmost value
int32_t offset = (ctx->stack_diff - 1) * 8; int32_t offset = (ctx->stack_diff - 1) * 8;
return mem_opnd(64, RSI, offset); return mem_opnd(64, R9, offset);
} }
/* /*
@ -125,7 +125,7 @@ x86opnd_t ctx_stack_pop(ctx_t* ctx, size_t n)
{ {
// SP points just above the topmost value // SP points just above the topmost value
int32_t offset = (ctx->stack_diff - 1) * 8; int32_t offset = (ctx->stack_diff - 1) * 8;
x86opnd_t top = mem_opnd(64, RSI, offset); x86opnd_t top = mem_opnd(64, R9, offset);
ctx->stack_diff -= n; ctx->stack_diff -= n;
@ -136,7 +136,7 @@ x86opnd_t ctx_stack_opnd(ctx_t* ctx, int32_t idx)
{ {
// SP points just above the topmost value // SP points just above the topmost value
int32_t offset = (ctx->stack_diff - 1 - idx) * 8; int32_t offset = (ctx->stack_diff - 1 - idx) * 8;
x86opnd_t opnd = mem_opnd(64, RSI, offset); x86opnd_t opnd = mem_opnd(64, R9, offset);
return opnd; return opnd;
} }
@ -159,8 +159,8 @@ ujit_gen_exit(codeblock_t* cb, ctx_t* ctx, VALUE* exit_pc)
if (ctx->stack_diff != 0) if (ctx->stack_diff != 0)
{ {
x86opnd_t stack_pointer = ctx_sp_opnd(ctx, 1); x86opnd_t stack_pointer = ctx_sp_opnd(ctx, 1);
lea(cb, RSI, stack_pointer); lea(cb, R9, stack_pointer);
mov(cb, mem_opnd(64, RDI, 8), RSI); mov(cb, mem_opnd(64, RDI, 8), R9);
} }
// Directly return the next PC, which is a constant // Directly return the next PC, which is a constant
@ -205,7 +205,7 @@ Eventually, this will handle multiple instructions in a sequence
MicroJIT code gets a pointer to the cfp as the first argument in RDI MicroJIT code gets a pointer to the cfp as the first argument in RDI
See rb_ujit_empty_func(rb_control_frame_t *cfp) in iseq.c See rb_ujit_empty_func(rb_control_frame_t *cfp) in iseq.c
Throughout the generated code, we store the current stack pointer in RSI Throughout the generated code, we store the current stack pointer in R9
System V ABI reference: System V ABI reference:
https://wiki.osdev.org/System_V_ABI#x86-64 https://wiki.osdev.org/System_V_ABI#x86-64
@ -270,8 +270,8 @@ ujit_compile_insn(const rb_iseq_t *iseq, unsigned int insn_idx, unsigned int* ne
{ {
ujit_gen_entry(cb); ujit_gen_entry(cb);
// Load the current SP from the CFP into RSI // Load the current SP from the CFP into R9
mov(cb, RSI, mem_opnd(64, RDI, 8)); mov(cb, R9, mem_opnd(64, RDI, 8));
} }
// Call the code generation function // Call the code generation function
@ -659,7 +659,7 @@ gen_opt_send_without_block(codeblock_t* cb, codeblock_t* ocb, ctx_t* ctx)
// Save the MicroJIT registers // Save the MicroJIT registers
push(cb, RDI); push(cb, RDI);
push(cb, RSI); push(cb, R9);
@ -671,7 +671,7 @@ gen_opt_send_without_block(codeblock_t* cb, codeblock_t* ocb, ctx_t* ctx)
// Restore MicroJIT registers // Restore MicroJIT registers
pop(cb, RSI); pop(cb, R9);
pop(cb, RDI); pop(cb, RDI);