diff options
Diffstat (limited to 'x86_64-gen.c')
| -rw-r--r-- | x86_64-gen.c | 47 |
1 files changed, 43 insertions, 4 deletions
diff --git a/x86_64-gen.c b/x86_64-gen.c index db24cdd..24fa2c6 100644 --- a/x86_64-gen.c +++ b/x86_64-gen.c @@ -23,7 +23,7 @@ #ifdef TARGET_DEFS_ONLY /* number of available registers */ -#define NB_REGS 24 +#define NB_REGS 25 #define NB_ASM_REGS 8 /* a register can belong to several classes. The classes must be @@ -57,6 +57,7 @@ enum { TREG_RAX = 0, TREG_RCX = 1, TREG_RDX = 2, + TREG_RSP = 4, TREG_RSI = 6, TREG_RDI = 7, @@ -74,7 +75,7 @@ enum { TREG_XMM6 = 22, TREG_XMM7 = 23, - TREG_ST0 = 4, // SP slot won't be used + TREG_ST0 = 24, TREG_MEM = 0x20, }; @@ -125,7 +126,7 @@ ST_DATA const int reg_classes[NB_REGS] = { /* ecx */ RC_INT | RC_RCX, /* edx */ RC_INT | RC_RDX, 0, - /* st0 */ RC_ST0, + 0, 0, 0, 0, @@ -147,7 +148,8 @@ ST_DATA const int reg_classes[NB_REGS] = { but they are not tagged with RC_FLOAT because they are callee saved on Windows */ RC_XMM6, - RC_XMM7 + RC_XMM7, + /* st0 */ RC_ST0 }; static unsigned long func_sub_sp_offset; @@ -2080,6 +2082,43 @@ void ggoto(void) vtop--; } +/* Save the stack pointer onto the stack and return the location of its address */ +ST_FUNC void gen_vla_sp_save(int addr) { + /* mov %rsp,addr(%rbp)*/ + gen_modrm64(0x89, TREG_RSP, VT_LOCAL, NULL, addr); +} + +/* Restore the SP from a location on the stack */ +ST_FUNC void gen_vla_sp_restore(int addr) { + gen_modrm64(0x8b, TREG_RSP, VT_LOCAL, NULL, addr); +} + +/* Subtract from the stack pointer, and push the resulting value onto the stack */ +ST_FUNC void gen_vla_alloc(CType *type, int align) { +#ifdef TCC_TARGET_PE + /* alloca does more than just adjust %rsp on Windows */ + vpush_global_sym(&func_old_type, TOK_alloca); + vswap(); /* Move alloca ref past allocation size */ + gfunc_call(1); + vset(type, REG_IRET, 0); +#else + int r; + r = gv(RC_INT); /* allocation size */ + /* sub r,%rsp */ + o(0x2b48); + o(0xe0 | REG_VALUE(r)); + /* We align to 16 bytes rather than align */ + /* and ~15, %rsp */ + o(0xf0e48348); + /* mov %rsp, r */ + o(0x8948); + o(0xe0 | REG_VALUE(r)); + vpop(); + vset(type, r, 0); +#endif +} + + /* end of x86-64 code generator */ /*************************************************************/ #endif /* ! TARGET_DEFS_ONLY */ |