diff options
Diffstat (limited to 'gcc/config/ia64/ia64.c')
| -rw-r--r-- | gcc/config/ia64/ia64.c | 53 |
1 files changed, 42 insertions, 11 deletions
diff --git a/gcc/config/ia64/ia64.c b/gcc/config/ia64/ia64.c index 7e757523381..75c8f0ee6c4 100644 --- a/gcc/config/ia64/ia64.c +++ b/gcc/config/ia64/ia64.c @@ -302,6 +302,7 @@ static enum machine_mode ia64_promote_function_mode (const_tree, int *, const_tree, int); +static void ia64_trampoline_init (rtx, tree, rtx); /* Table of valid machine attributes. */ static const struct attribute_spec ia64_attribute_table[] = @@ -532,6 +533,9 @@ static const struct attribute_spec ia64_attribute_table[] = #undef TARGET_CAN_ELIMINATE #define TARGET_CAN_ELIMINATE ia64_can_eliminate +#undef TARGET_TRAMPOLINE_INIT +#define TARGET_TRAMPOLINE_INIT ia64_trampoline_init + struct gcc_target targetm = TARGET_INITIALIZER; typedef enum @@ -3945,10 +3949,35 @@ ia64_dbx_register_number (int regno) return regno; } -void -ia64_initialize_trampoline (rtx addr, rtx fnaddr, rtx static_chain) +/* Implement TARGET_TRAMPOLINE_INIT. + + The trampoline should set the static chain pointer to value placed + into the trampoline and should branch to the specified routine. + To make the normal indirect-subroutine calling convention work, + the trampoline must look like a function descriptor; the first + word being the target address and the second being the target's + global pointer. + + We abuse the concept of a global pointer by arranging for it + to point to the data we need to load. The complete trampoline + has the following form: + + +-------------------+ \ + TRAMP: | __ia64_trampoline | | + +-------------------+ > fake function descriptor + | TRAMP+16 | | + +-------------------+ / + | target descriptor | + +-------------------+ + | static link | + +-------------------+ +*/ + +static void +ia64_trampoline_init (rtx m_tramp, tree fndecl, rtx static_chain) { - rtx addr_reg, tramp, eight = GEN_INT (8); + rtx fnaddr = XEXP (DECL_RTL (fndecl), 0); + rtx addr, addr_reg, tramp, eight = GEN_INT (8); /* The Intel assembler requires that the global __ia64_trampoline symbol be declared explicitly */ @@ -3965,13 +3994,13 @@ ia64_initialize_trampoline (rtx addr, rtx fnaddr, rtx static_chain) } /* Make sure addresses are Pmode even if we are in ILP32 mode. */ - addr = convert_memory_address (Pmode, addr); + addr = convert_memory_address (Pmode, XEXP (m_tramp, 0)); fnaddr = convert_memory_address (Pmode, fnaddr); static_chain = convert_memory_address (Pmode, static_chain); /* Load up our iterator. */ - addr_reg = gen_reg_rtx (Pmode); - emit_move_insn (addr_reg, addr); + addr_reg = copy_to_reg (addr); + m_tramp = adjust_automodify_address (m_tramp, Pmode, addr_reg, 0); /* The first two words are the fake descriptor: __ia64_trampoline, ADDR+16. */ @@ -3989,19 +4018,21 @@ ia64_initialize_trampoline (rtx addr, rtx fnaddr, rtx static_chain) emit_move_insn (reg, gen_rtx_MEM (Pmode, reg)); tramp = reg; } - emit_move_insn (gen_rtx_MEM (Pmode, addr_reg), tramp); + emit_move_insn (m_tramp, tramp); emit_insn (gen_adddi3 (addr_reg, addr_reg, eight)); + m_tramp = adjust_automodify_address (m_tramp, VOIDmode, NULL, 8); - emit_move_insn (gen_rtx_MEM (Pmode, addr_reg), - copy_to_reg (plus_constant (addr, 16))); + emit_move_insn (m_tramp, force_reg (Pmode, plus_constant (addr, 16))); emit_insn (gen_adddi3 (addr_reg, addr_reg, eight)); + m_tramp = adjust_automodify_address (m_tramp, VOIDmode, NULL, 8); /* The third word is the target descriptor. */ - emit_move_insn (gen_rtx_MEM (Pmode, addr_reg), fnaddr); + emit_move_insn (m_tramp, force_reg (Pmode, fnaddr)); emit_insn (gen_adddi3 (addr_reg, addr_reg, eight)); + m_tramp = adjust_automodify_address (m_tramp, VOIDmode, NULL, 8); /* The fourth word is the static chain. */ - emit_move_insn (gen_rtx_MEM (Pmode, addr_reg), static_chain); + emit_move_insn (m_tramp, static_chain); } /* Do any needed setup for a variadic function. CUM has not been updated |