mirror of
https://github.com/rust-lang/rust.git
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Removed unused context-switching assembly code.
This commit is contained in:
Maya Nitu
parent
34d6800092
commit
98ed882511
5
mk/rt.mk
5
mk/rt.mk
@ -35,7 +35,7 @@
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# that's per-target so you're allowed to conditionally add files based on the
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# target.
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################################################################################
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NATIVE_LIBS := rust_builtin hoedown morestack miniz context_switch \
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NATIVE_LIBS := rust_builtin hoedown morestack miniz \
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rustrt_native rust_test_helpers
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# $(1) is the target triple
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@ -58,8 +58,7 @@ NATIVE_DEPS_rustrt_native_$(1) := \
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arch/$$(HOST_$(1))/record_sp.S
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NATIVE_DEPS_rust_test_helpers_$(1) := rust_test_helpers.c
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NATIVE_DEPS_morestack_$(1) := arch/$$(HOST_$(1))/morestack.S
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NATIVE_DEPS_context_switch_$(1) := \
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arch/$$(HOST_$(1))/_context.S
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################################################################################
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# You shouldn't find it that necessary to edit anything below this line.
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@ -1,69 +0,0 @@
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// Mark stack as non-executable
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#if defined(__linux__) && defined(__ELF__)
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.section .note.GNU-stack, "", %progbits
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#endif
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.text
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.code 32
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.arm
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#if defined(__APPLE__)
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.align 2
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#else
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.align
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#endif
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#if defined(__APPLE__)
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#define SWAP_REGISTERS _rust_swap_registers
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#define BOOTSTRAP_TASK _rust_bootstrap_green_task
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#else
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#define SWAP_REGISTERS rust_swap_registers
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#define BOOTSTRAP_TASK rust_bootstrap_green_task
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#endif
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.globl SWAP_REGISTERS
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SWAP_REGISTERS:
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str r0, [r0, #0]
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str r3, [r0, #12]
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str r4, [r0, #16]
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str r5, [r0, #20]
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str r6, [r0, #24]
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str r7, [r0, #28]
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str r8, [r0, #32]
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str r9, [r0, #36]
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str r10, [r0, #40]
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str r11, [r0, #44]
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str r12, [r0, #48]
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str sp, [r0, #52]
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str lr, [r0, #56]
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mrs r2, cpsr
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str r2, [r0, #64]
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ldr r0, [r1, #0]
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ldr r3, [r1, #12]
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ldr r4, [r1, #16]
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ldr r5, [r1, #20]
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ldr r6, [r1, #24]
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ldr r7, [r1, #28]
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ldr r8, [r1, #32]
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ldr r9, [r1, #36]
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ldr r10, [r1, #40]
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ldr r11, [r1, #44]
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ldr r12, [r1, #48]
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ldr sp, [r1, #52]
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ldr lr, [r1, #56]
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ldr r2, [r1, #64]
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msr cpsr_cxsf, r2
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mov pc, lr
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// For reasons of this existence, see the comments in x86_64/_context.S
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.globl BOOTSTRAP_TASK
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BOOTSTRAP_TASK:
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mov r0, r0
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mov r1, r3
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mov r2, r4
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mov pc, r5
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@ -1,65 +0,0 @@
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// Mark stack as non-executable
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#if defined(__linux__) && defined(__ELF__)
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.section .note.GNU-stack, "", @progbits
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#endif
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.text
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/*
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Callee save registers:
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ebp, ebx, esi, edi
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Caller save registers:
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eax, ecx, edx
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*/
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/*
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Saves a set of registers. This is used by our implementation of
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getcontext.
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The registers_t variable is in (%esp)
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*/
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#if defined(__APPLE__) || defined(_WIN32)
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#define SWAP_REGISTERS _rust_swap_registers
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#else
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#define SWAP_REGISTERS rust_swap_registers
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#endif
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// swap_registers(registers_t *oregs, registers_t *regs)
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.globl SWAP_REGISTERS
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SWAP_REGISTERS:
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// save the old context
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movl 4(%esp), %eax
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movl %ebx, 4(%eax)
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movl %ebp, 16(%eax)
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movl %esi, 20(%eax)
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movl %edi, 24(%eax)
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// save the flags
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pushf
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popl %ecx
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movl %ecx, 44(%eax)
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// save the return address as the instruction pointer
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// and save the stack pointer of the caller
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popl %ecx
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movl %esp, 28(%eax)
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movl %ecx, 48(%eax)
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// restore the new context
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movl 4(%esp), %eax
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movl 4(%eax), %ebx
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movl 16(%eax), %ebp
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movl 20(%eax), %esi
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movl 24(%eax), %edi
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movl 28(%eax), %esp
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// restore the flags
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movl 44(%eax), %ecx
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push %ecx
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popf
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// Return!
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jmp *48(%eax)
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@ -1,88 +0,0 @@
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// Mark stack as non-executable
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#if defined(__linux__) && defined(__ELF__)
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.section .note.GNU-stack, "", @progbits
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#endif
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.text
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.globl rust_swap_registers
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.align 2
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.set nomips16
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.ent rust_swap_registers
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rust_swap_registers:
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.set noreorder
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.set nomacro
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.set noat
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sw $1, 1 * 4($4)
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sw $2, 2 * 4($4)
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sw $3, 3 * 4($4)
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sw $4, 4 * 4($4)
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sw $5, 5 * 4($4)
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sw $6, 6 * 4($4)
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sw $7, 7 * 4($4)
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sw $8, 8 * 4($4)
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sw $9, 9 * 4($4)
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sw $10, 10 * 4($4)
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sw $11, 11 * 4($4)
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sw $12, 12 * 4($4)
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sw $13, 13 * 4($4)
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sw $14, 14 * 4($4)
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sw $15, 15 * 4($4)
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sw $16, 16 * 4($4)
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sw $17, 17 * 4($4)
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sw $18, 18 * 4($4)
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sw $19, 19 * 4($4)
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sw $20, 20 * 4($4)
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sw $21, 21 * 4($4)
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sw $22, 22 * 4($4)
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sw $23, 23 * 4($4)
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sw $24, 24 * 4($4)
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sw $25, 25 * 4($4)
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sw $26, 26 * 4($4)
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sw $27, 27 * 4($4)
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sw $28, 28 * 4($4)
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sw $29, 29 * 4($4)
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sw $30, 30 * 4($4)
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sw $31, 31 * 4($4)
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lw $1, 1 * 4($5)
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lw $2, 2 * 4($5)
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lw $3, 3 * 4($5)
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lw $4, 4 * 4($5)
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lw $6, 6 * 4($5)
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lw $7, 7 * 4($5)
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lw $8, 8 * 4($5)
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lw $9, 9 * 4($5)
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lw $10, 10 * 4($5)
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lw $11, 11 * 4($5)
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lw $12, 12 * 4($5)
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lw $13, 13 * 4($5)
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lw $14, 14 * 4($5)
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lw $15, 15 * 4($5)
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lw $16, 16 * 4($5)
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lw $17, 17 * 4($5)
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lw $18, 18 * 4($5)
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lw $19, 19 * 4($5)
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lw $20, 20 * 4($5)
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lw $21, 21 * 4($5)
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lw $22, 22 * 4($5)
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lw $23, 23 * 4($5)
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lw $24, 24 * 4($5)
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lw $25, 25 * 4($5)
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lw $26, 26 * 4($5)
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lw $27, 27 * 4($5)
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lw $28, 28 * 4($5)
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lw $29, 29 * 4($5)
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lw $30, 30 * 4($5)
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lw $31, 31 * 4($5)
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lw $5, 5 * 4($5)
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jr $31
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nop
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.end rust_swap_registers
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@ -1,88 +0,0 @@
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// Mark stack as non-executable
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#if defined(__linux__) && defined(__ELF__)
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.section .note.GNU-stack, "", @progbits
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#endif
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.text
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.globl rust_swap_registers
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.align 2
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.set nomips16
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.ent rust_swap_registers
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rust_swap_registers:
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.set noreorder
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.set nomacro
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.set noat
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sw $1, 1 * 4($4)
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sw $2, 2 * 4($4)
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sw $3, 3 * 4($4)
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sw $4, 4 * 4($4)
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sw $5, 5 * 4($4)
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sw $6, 6 * 4($4)
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sw $7, 7 * 4($4)
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sw $8, 8 * 4($4)
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sw $9, 9 * 4($4)
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sw $10, 10 * 4($4)
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sw $11, 11 * 4($4)
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sw $12, 12 * 4($4)
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sw $13, 13 * 4($4)
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sw $14, 14 * 4($4)
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sw $15, 15 * 4($4)
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sw $16, 16 * 4($4)
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sw $17, 17 * 4($4)
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sw $18, 18 * 4($4)
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sw $19, 19 * 4($4)
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sw $20, 20 * 4($4)
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sw $21, 21 * 4($4)
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sw $22, 22 * 4($4)
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sw $23, 23 * 4($4)
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sw $24, 24 * 4($4)
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sw $25, 25 * 4($4)
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sw $26, 26 * 4($4)
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sw $27, 27 * 4($4)
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sw $28, 28 * 4($4)
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sw $29, 29 * 4($4)
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sw $30, 30 * 4($4)
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sw $31, 31 * 4($4)
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lw $1, 1 * 4($5)
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lw $2, 2 * 4($5)
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lw $3, 3 * 4($5)
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lw $4, 4 * 4($5)
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lw $6, 6 * 4($5)
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lw $7, 7 * 4($5)
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lw $8, 8 * 4($5)
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lw $9, 9 * 4($5)
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lw $10, 10 * 4($5)
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lw $11, 11 * 4($5)
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lw $12, 12 * 4($5)
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lw $13, 13 * 4($5)
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lw $14, 14 * 4($5)
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lw $15, 15 * 4($5)
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lw $16, 16 * 4($5)
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lw $17, 17 * 4($5)
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lw $18, 18 * 4($5)
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lw $19, 19 * 4($5)
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lw $20, 20 * 4($5)
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lw $21, 21 * 4($5)
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lw $22, 22 * 4($5)
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lw $23, 23 * 4($5)
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lw $24, 24 * 4($5)
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lw $25, 25 * 4($5)
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lw $26, 26 * 4($5)
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lw $27, 27 * 4($5)
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lw $28, 28 * 4($5)
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lw $29, 29 * 4($5)
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lw $30, 30 * 4($5)
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lw $31, 31 * 4($5)
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lw $5, 5 * 4($5)
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jr $31
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nop
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.end rust_swap_registers
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@ -1,192 +0,0 @@
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// Mark stack as non-executable
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#if defined(__linux__) && defined(__ELF__)
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.section .note.GNU-stack, "", @progbits
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#endif
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#include "regs.h"
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#define ARG0 RUSTRT_ARG0_S
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#define ARG1 RUSTRT_ARG1_S
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.text
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/*
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According to ABI documentation found at
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http://www.x86-64.org/documentation.html
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and Microsoft discussion at
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http://msdn.microsoft.com/en-US/library/9z1stfyw%28v=VS.80%29.aspx.
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BOTH CALLING CONVENTIONS
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Callee save registers:
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R12--R15, RDI, RSI, RBX, RBP, RSP
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XMM0--XMM5
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Caller save registers:
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RAX, RCX, RDX, R8--R11
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XMM6--XMM15
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Floating point stack
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MAC/AMD CALLING CONVENTIONS
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Integer arguments go in registers:
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rdi, rsi, rdx, rcx, r8, r9
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User flags have no specified role and are not preserved
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across calls, with the exception of DF in %rFLAGS,
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which must be clear (set to "forward" direction)
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on function entry and return.
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MICROSOFT CALLING CONVENTIONS
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Return value: RAX
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First four arguments:
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RCX, RDX, R8, R9
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XMM0, XMM1, XMM2, XMM3
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*/
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/*
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Stores current registers into arg0/RCX and restores
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registers found in arg1/RDX. This is used by our
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implementation of getcontext. Only saves/restores nonvolatile
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registers and the register used for the first argument.
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Volatile registers in general ought to be saved by the caller
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anyhow.
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*/
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#if defined(__APPLE__)
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#define SWAP_REGISTERS _rust_swap_registers
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#else
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#define SWAP_REGISTERS rust_swap_registers
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#endif
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// swap_registers(registers_t *oregs, registers_t *regs)
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.globl SWAP_REGISTERS
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SWAP_REGISTERS:
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// n.b. when we enter, the return address is at the top of
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// the stack (i.e., 0(%RSP)) and the argument is in
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// RUSTRT_ARG0_S. We
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// simply save all NV registers into oregs.
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// We then restore all NV registers from regs. This restores
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// the old stack pointer, which should include the proper
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// return address. We can therefore just return normally to
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// jump back into the old code.
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// Save instruction pointer:
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pop %rax
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mov %rax, (RUSTRT_IP*8)(RUSTRT_ARG0_S)
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// Save non-volatile integer registers:
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// (including RSP)
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mov %rbx, (RUSTRT_RBX*8)(ARG0)
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mov %rsp, (RUSTRT_RSP*8)(ARG0)
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mov %rbp, (RUSTRT_RBP*8)(ARG0)
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mov %r12, (RUSTRT_R12*8)(ARG0)
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mov %r13, (RUSTRT_R13*8)(ARG0)
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mov %r14, (RUSTRT_R14*8)(ARG0)
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mov %r15, (RUSTRT_R15*8)(ARG0)
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#if defined(__MINGW32__) || defined(_WINDOWS)
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mov %rdi, (RUSTRT_RDI*8)(ARG0)
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mov %rsi, (RUSTRT_RSI*8)(ARG0)
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#endif
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// Save 0th argument register:
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mov ARG0, (RUSTRT_ARG0*8)(ARG0)
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// Save non-volatile XMM registers:
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#if defined(__MINGW32__) || defined(_WINDOWS)
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movapd %xmm6, (RUSTRT_XMM6*8)(ARG0)
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movapd %xmm7, (RUSTRT_XMM7*8)(ARG0)
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movapd %xmm8, (RUSTRT_XMM8*8)(ARG0)
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movapd %xmm9, (RUSTRT_XMM9*8)(ARG0)
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movapd %xmm10, (RUSTRT_XMM10*8)(ARG0)
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movapd %xmm11, (RUSTRT_XMM11*8)(ARG0)
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movapd %xmm12, (RUSTRT_XMM12*8)(ARG0)
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movapd %xmm13, (RUSTRT_XMM13*8)(ARG0)
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movapd %xmm14, (RUSTRT_XMM14*8)(ARG0)
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movapd %xmm15, (RUSTRT_XMM15*8)(ARG0)
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#else
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movapd %xmm0, (RUSTRT_XMM0*8)(ARG0)
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movapd %xmm1, (RUSTRT_XMM1*8)(ARG0)
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movapd %xmm2, (RUSTRT_XMM2*8)(ARG0)
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movapd %xmm3, (RUSTRT_XMM3*8)(ARG0)
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movapd %xmm4, (RUSTRT_XMM4*8)(ARG0)
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movapd %xmm5, (RUSTRT_XMM5*8)(ARG0)
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#endif
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// Restore non-volatile integer registers:
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// (including RSP)
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mov (RUSTRT_RBX*8)(ARG1), %rbx
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mov (RUSTRT_RSP*8)(ARG1), %rsp
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mov (RUSTRT_RBP*8)(ARG1), %rbp
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mov (RUSTRT_R12*8)(ARG1), %r12
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mov (RUSTRT_R13*8)(ARG1), %r13
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mov (RUSTRT_R14*8)(ARG1), %r14
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mov (RUSTRT_R15*8)(ARG1), %r15
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#if defined(__MINGW32__) || defined(_WINDOWS)
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mov (RUSTRT_RDI*8)(ARG1), %rdi
|
||||
mov (RUSTRT_RSI*8)(ARG1), %rsi
|
||||
#endif
|
||||
|
||||
// Restore 0th argument register:
|
||||
mov (RUSTRT_ARG0*8)(ARG1), ARG0
|
||||
|
||||
// Restore non-volatile XMM registers:
|
||||
#if defined(__MINGW32__) || defined(_WINDOWS)
|
||||
movapd (RUSTRT_XMM6*8)(ARG1), %xmm6
|
||||
movapd (RUSTRT_XMM7*8)(ARG1), %xmm7
|
||||
movapd (RUSTRT_XMM8*8)(ARG1), %xmm8
|
||||
movapd (RUSTRT_XMM9*8)(ARG1), %xmm9
|
||||
movapd (RUSTRT_XMM10*8)(ARG1), %xmm10
|
||||
movapd (RUSTRT_XMM11*8)(ARG1), %xmm11
|
||||
movapd (RUSTRT_XMM12*8)(ARG1), %xmm12
|
||||
movapd (RUSTRT_XMM13*8)(ARG1), %xmm13
|
||||
movapd (RUSTRT_XMM14*8)(ARG1), %xmm14
|
||||
movapd (RUSTRT_XMM15*8)(ARG1), %xmm15
|
||||
#else
|
||||
movapd (RUSTRT_XMM0*8)(ARG1), %xmm0
|
||||
movapd (RUSTRT_XMM1*8)(ARG1), %xmm1
|
||||
movapd (RUSTRT_XMM2*8)(ARG1), %xmm2
|
||||
movapd (RUSTRT_XMM3*8)(ARG1), %xmm3
|
||||
movapd (RUSTRT_XMM4*8)(ARG1), %xmm4
|
||||
movapd (RUSTRT_XMM5*8)(ARG1), %xmm5
|
||||
#endif
|
||||
|
||||
// Jump to the instruction pointer
|
||||
// found in regs:
|
||||
jmp *(RUSTRT_IP*8)(ARG1)
|
||||
|
||||
// This function below, rust_bootstrap_green_task, is used to initialize a green
|
||||
// task. This code is the very first code that is run whenever a green task
|
||||
// starts. The only assumptions that this code makes is that it has a register
|
||||
// context previously set up by Context::new() and some values are in some
|
||||
// special registers.
|
||||
//
|
||||
// In theory the register context could be set up and then the context switching
|
||||
// would plop us directly into some 'extern "C" fn', but not all platforms have
|
||||
// the argument registers saved throughout a context switch (linux doesn't save
|
||||
// rdi/rsi, the first two argument registers). Instead of modifying all context
|
||||
// switches, instead the initial data for starting a green thread is shoved into
|
||||
// unrelated registers (r12/13, etc) which always need to be saved on context
|
||||
// switches anyway.
|
||||
//
|
||||
// With this strategy we get the benefit of being able to pass a fair bit of
|
||||
// contextual data from the start of a green task to its init function, as well
|
||||
// as not hindering any context switches.
|
||||
//
|
||||
// If you alter this code in any way, you likely need to update
|
||||
// src/libgreen/context.rs as well.
|
||||
|
||||
#if defined(__APPLE__)
|
||||
#define BOOTSTRAP _rust_bootstrap_green_task
|
||||
#else
|
||||
#define BOOTSTRAP rust_bootstrap_green_task
|
||||
#endif
|
||||
.globl BOOTSTRAP
|
||||
BOOTSTRAP:
|
||||
mov %r12, RUSTRT_ARG0_S
|
||||
mov %r13, RUSTRT_ARG1_S
|
||||
mov %r14, RUSTRT_ARG2_S
|
||||
jmpq *%r15
|
||||
@ -1,65 +0,0 @@
|
||||
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
|
||||
// file at the top-level directory of this distribution and at
|
||||
// http://rust-lang.org/COPYRIGHT.
|
||||
//
|
||||
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
|
||||
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
|
||||
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
|
||||
// option. This file may not be copied, modified, or distributed
|
||||
// except according to those terms.
|
||||
|
||||
// This is loosely kept in sync with src/libstd/rt/context.rs
|
||||
|
||||
#define RUSTRT_RBX 0
|
||||
#define RUSTRT_RSP 1
|
||||
#define RUSTRT_RBP 2
|
||||
// RCX on Windows, RDI elsewhere
|
||||
#define RUSTRT_ARG0 3
|
||||
#define RUSTRT_R12 4
|
||||
#define RUSTRT_R13 5
|
||||
#define RUSTRT_R14 6
|
||||
#define RUSTRT_R15 7
|
||||
#define RUSTRT_IP 8
|
||||
#if defined(__MINGW32__) || defined(_WINDOWS)
|
||||
#define RUSTRT_RDI 9
|
||||
#define RUSTRT_RSI 10
|
||||
#define RUSTRT_ST1 11
|
||||
#define RUSTRT_ST2 12
|
||||
#define RUSTRT_XMM6 14
|
||||
#define RUSTRT_XMM7 16
|
||||
#define RUSTRT_XMM8 18
|
||||
#define RUSTRT_XMM9 20
|
||||
#define RUSTRT_XMM10 22
|
||||
#define RUSTRT_XMM11 24
|
||||
#define RUSTRT_XMM12 26
|
||||
#define RUSTRT_XMM13 28
|
||||
#define RUSTRT_XMM14 30
|
||||
#define RUSTRT_XMM15 32
|
||||
#define RUSTRT_MAX 34
|
||||
#else
|
||||
// Not used, just padding
|
||||
#define RUSTRT_XXX 9
|
||||
#define RUSTRT_XMM0 10
|
||||
#define RUSTRT_XMM1 12
|
||||
#define RUSTRT_XMM2 14
|
||||
#define RUSTRT_XMM3 16
|
||||
#define RUSTRT_XMM4 18
|
||||
#define RUSTRT_XMM5 20
|
||||
#define RUSTRT_MAX 22
|
||||
#endif
|
||||
|
||||
// ARG0 is the register in which the first argument goes.
|
||||
// Naturally this depends on your operating system.
|
||||
#if defined(__MINGW32__) || defined(_WINDOWS)
|
||||
# define RUSTRT_ARG0_S %rcx
|
||||
# define RUSTRT_ARG1_S %rdx
|
||||
# define RUSTRT_ARG2_S %r8
|
||||
# define RUSTRT_ARG3_S %r9
|
||||
#else
|
||||
# define RUSTRT_ARG0_S %rdi
|
||||
# define RUSTRT_ARG1_S %rsi
|
||||
# define RUSTRT_ARG2_S %rdx
|
||||
# define RUSTRT_ARG3_S %rcx
|
||||
# define RUSTRT_ARG4_S %r8
|
||||
# define RUSTRT_ARG5_S %r9
|
||||
#endif
|
||||
Loading…
Reference in New Issue
Block a user