/*
* mono_arch_get_gsharedvt_arg_trampoline:
*
* See tramp-x86.c for documentation.
*/
gpointer
mono_arch_get_gsharedvt_arg_trampoline (MonoDomain *domain, gpointer arg, gpointer addr)
{
guint8 *code, *start;
int buf_len;
buf_len = 32;
start = code = mono_domain_code_reserve (domain, buf_len);
amd64_mov_reg_imm (code, AMD64_RAX, arg);
amd64_jump_code (code, addr);
g_assert ((code - start) < buf_len);
mono_arch_flush_icache (start, code - start);
mono_profiler_code_buffer_new (start, code - start, MONO_PROFILER_CODE_BUFFER_GENERICS_TRAMPOLINE, NULL);
mono_tramp_info_register (mono_tramp_info_create (NULL, start, code - start, NULL, NULL), domain);
return start;
}
/*
* get_throw_trampoline:
*
* Generate a call to mono_amd64_throw_exception/
* mono_amd64_throw_corlib_exception.
*/
static gpointer
get_throw_trampoline (MonoTrampInfo **info, gboolean rethrow, gboolean corlib, gboolean llvm_abs, gboolean resume_unwind, const char *tramp_name, gboolean aot)
{
guint8* start;
guint8 *code;
MonoJumpInfo *ji = NULL;
GSList *unwind_ops = NULL;
int i, stack_size, arg_offsets [16], ctx_offset, regs_offset, dummy_stack_space;
const guint kMaxCodeSize = NACL_SIZE (256, 512);
#ifdef TARGET_WIN32
dummy_stack_space = 6 * sizeof(mgreg_t); /* Windows expects stack space allocated for all 6 dummy args. */
#else
dummy_stack_space = 0;
#endif
start = code = (guint8 *)mono_global_codeman_reserve (kMaxCodeSize);
/* The stack is unaligned on entry */
stack_size = ALIGN_TO (sizeof (MonoContext) + 64 + dummy_stack_space, MONO_ARCH_FRAME_ALIGNMENT) + 8;
code = start;
if (info)
unwind_ops = mono_arch_get_cie_program ();
/* Alloc frame */
amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, stack_size);
if (info)
mono_add_unwind_op_def_cfa_offset (unwind_ops, code, start, stack_size + 8);
/*
* To hide linux/windows calling convention differences, we pass all arguments on
* the stack by passing 6 dummy values in registers.
*/
arg_offsets [0] = dummy_stack_space + 0;
arg_offsets [1] = dummy_stack_space + sizeof(mgreg_t);
arg_offsets [2] = dummy_stack_space + sizeof(mgreg_t) * 2;
ctx_offset = dummy_stack_space + sizeof(mgreg_t) * 4;
regs_offset = ctx_offset + MONO_STRUCT_OFFSET (MonoContext, gregs);
/* Save registers */
for (i = 0; i < AMD64_NREG; ++i)
if (i != AMD64_RSP)
amd64_mov_membase_reg (code, AMD64_RSP, regs_offset + (i * sizeof(mgreg_t)), i, sizeof(mgreg_t));
/* Save RSP */
amd64_lea_membase (code, AMD64_RAX, AMD64_RSP, stack_size + sizeof(mgreg_t));
amd64_mov_membase_reg (code, AMD64_RSP, regs_offset + (AMD64_RSP * sizeof(mgreg_t)), X86_EAX, sizeof(mgreg_t));
/* Save IP */
if (llvm_abs)
amd64_alu_reg_reg (code, X86_XOR, AMD64_RAX, AMD64_RAX);
else
amd64_mov_reg_membase (code, AMD64_RAX, AMD64_RSP, stack_size, sizeof(mgreg_t));
amd64_mov_membase_reg (code, AMD64_RSP, regs_offset + (AMD64_RIP * sizeof(mgreg_t)), AMD64_RAX, sizeof(mgreg_t));
/* Set arg1 == ctx */
amd64_lea_membase (code, AMD64_RAX, AMD64_RSP, ctx_offset);
amd64_mov_membase_reg (code, AMD64_RSP, arg_offsets [0], AMD64_RAX, sizeof(mgreg_t));
/* Set arg2 == exc/ex_token_index */
if (resume_unwind)
amd64_mov_membase_imm (code, AMD64_RSP, arg_offsets [1], 0, sizeof(mgreg_t));
else
amd64_mov_membase_reg (code, AMD64_RSP, arg_offsets [1], AMD64_ARG_REG1, sizeof(mgreg_t));
/* Set arg3 == rethrow/pc offset */
if (resume_unwind) {
amd64_mov_membase_imm (code, AMD64_RSP, arg_offsets [2], 0, sizeof(mgreg_t));
} else if (corlib) {
amd64_mov_membase_reg (code, AMD64_RSP, arg_offsets [2], AMD64_ARG_REG2, sizeof(mgreg_t));
if (llvm_abs)
/*
* The caller is LLVM code which passes the absolute address not a pc offset,
* so compensate by passing 0 as 'rip' and passing the negated abs address as
* the pc offset.
*/
amd64_neg_membase (code, AMD64_RSP, arg_offsets [2]);
} else {
amd64_mov_membase_imm (code, AMD64_RSP, arg_offsets [2], rethrow, sizeof(mgreg_t));
}
if (aot) {
const char *icall_name;
if (resume_unwind)
icall_name = "mono_amd64_resume_unwind";
else if (corlib)
icall_name = "mono_amd64_throw_corlib_exception";
else
icall_name = "mono_amd64_throw_exception";
ji = mono_patch_info_list_prepend (ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, icall_name);
amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
} else {
amd64_mov_reg_imm (code, AMD64_R11, resume_unwind ? ((gpointer)mono_amd64_resume_unwind) : (corlib ? (gpointer)mono_amd64_throw_corlib_exception : (gpointer)mono_amd64_throw_exception));
}
amd64_call_reg (code, AMD64_R11);
amd64_breakpoint (code);
mono_arch_flush_icache (start, code - start);
g_assert ((code - start) < kMaxCodeSize);
nacl_global_codeman_validate(&start, kMaxCodeSize, &code);
mono_profiler_code_buffer_new (start, code - start, MONO_PROFILER_CODE_BUFFER_EXCEPTION_HANDLING, NULL);
if (info)
*info = mono_tramp_info_create (tramp_name, start, code - start, ji, unwind_ops);
return start;
}
gpointer
mono_arch_get_throw_pending_exception (MonoTrampInfo **info, gboolean aot)
{
guint8 *code, *start;
guint8 *br[1];
gpointer throw_trampoline;
MonoJumpInfo *ji = NULL;
GSList *unwind_ops = NULL;
const guint kMaxCodeSize = NACL_SIZE (128, 256);
start = code = mono_global_codeman_reserve (kMaxCodeSize);
/* We are in the frame of a managed method after a call */
/*
* We would like to throw the pending exception in such a way that it looks to
* be thrown from the managed method.
*/
/* Save registers which might contain the return value of the call */
amd64_push_reg (code, AMD64_RAX);
amd64_push_reg (code, AMD64_RDX);
amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
amd64_movsd_membase_reg (code, AMD64_RSP, 0, AMD64_XMM0);
/* Align stack */
amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
/* Obtain the pending exception */
if (aot) {
ji = mono_patch_info_list_prepend (ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_thread_get_and_clear_pending_exception");
amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
} else {
amd64_mov_reg_imm (code, AMD64_R11, mono_thread_get_and_clear_pending_exception);
}
amd64_call_reg (code, AMD64_R11);
/* Check if it is NULL, and branch */
amd64_alu_reg_imm (code, X86_CMP, AMD64_RAX, 0);
br[0] = code; x86_branch8 (code, X86_CC_EQ, 0, FALSE);
/* exc != NULL branch */
/* Save the exc on the stack */
amd64_push_reg (code, AMD64_RAX);
/* Align stack */
amd64_alu_reg_imm (code, X86_SUB, AMD64_RSP, 8);
/* Obtain the original ip and clear the flag in previous_lmf */
if (aot) {
ji = mono_patch_info_list_prepend (ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_amd64_get_original_ip");
amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
} else {
amd64_mov_reg_imm (code, AMD64_R11, mono_amd64_get_original_ip);
}
amd64_call_reg (code, AMD64_R11);
/* Load exc */
amd64_mov_reg_membase (code, AMD64_R11, AMD64_RSP, 8, 8);
/* Pop saved stuff from the stack */
amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 6 * 8);
/* Setup arguments for the throw trampoline */
/* Exception */
amd64_mov_reg_reg (code, AMD64_ARG_REG1, AMD64_R11, 8);
/* The trampoline expects the caller ip to be pushed on the stack */
amd64_push_reg (code, AMD64_RAX);
/* Call the throw trampoline */
if (aot) {
ji = mono_patch_info_list_prepend (ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_throw_exception");
amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
} else {
throw_trampoline = mono_get_throw_exception ();
amd64_mov_reg_imm (code, AMD64_R11, throw_trampoline);
}
/* We use a jump instead of a call so we can push the original ip on the stack */
amd64_jump_reg (code, AMD64_R11);
/* ex == NULL branch */
mono_amd64_patch (br [0], code);
/* Obtain the original ip and clear the flag in previous_lmf */
if (aot) {
ji = mono_patch_info_list_prepend (ji, code - start, MONO_PATCH_INFO_JIT_ICALL_ADDR, "mono_amd64_get_original_ip");
amd64_mov_reg_membase (code, AMD64_R11, AMD64_RIP, 0, 8);
} else {
amd64_mov_reg_imm (code, AMD64_R11, mono_amd64_get_original_ip);
}
amd64_call_reg (code, AMD64_R11);
amd64_mov_reg_reg (code, AMD64_R11, AMD64_RAX, 8);
/* Restore registers */
amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 8);
amd64_movsd_reg_membase (code, AMD64_XMM0, AMD64_RSP, 0);
amd64_alu_reg_imm (code, X86_ADD, AMD64_RSP, 8);
amd64_pop_reg (code, AMD64_RDX);
amd64_pop_reg (code, AMD64_RAX);
/* Return to original code */
amd64_jump_reg (code, AMD64_R11);
g_assert ((code - start) < kMaxCodeSize);
nacl_global_codeman_validate(&start, kMaxCodeSize, &code);
if (info)
*info = mono_tramp_info_create ("throw_pending_exception", start, code - start, ji, unwind_ops);
return start;
}
