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Implement callee-saved registers

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This commit is contained in:
Takashi Kokubun 2022-12-23 14:46:39 -08:00
parent 71595a37ba
commit 23a58105ee
3 changed files with 45 additions and 4 deletions
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12
lib/ruby_vm/mjit/compiler.rb
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@ -58,8 +58,16 @@ module RubyVM::MJIT
# ec: rdi
# cfp: rsi
#
# Callee-saved: rbx, rsp, rbp, r12, r13, r14, r15
# Caller-saved: rax, rdi, rsi, rdx, rcx, r8, r9, r10, r11
#
# @param asm [RubyVM::MJIT::X86Assembler]
def compile_prologue(asm)
# Save callee-saved registers used by JITed code
asm.push(:rbx)
# Load sp to a register
asm.mov(:rbx, [:rsi, C.rb_control_frame_t.offsetof(:sp)]) # rbx = cfp->sp
end
@ -103,6 +111,9 @@ module RubyVM::MJIT
asm.mov([:rsi, C.rb_control_frame_t.offsetof(:sp)], :rbx) # cfp->sp = rbx
end
# Restore callee-saved registers
asm.pop(:rbx)
asm.mov(:rax, Qundef)
asm.ret
end
@ -115,6 +126,7 @@ module RubyVM::MJIT
C.dump_disasm(from, to).each do |address, mnemonic, op_str|
puts " 0x#{"%p" % address}: #{mnemonic} #{op_str}"
end
puts
end
end
end