diff options
Diffstat (limited to 'gdb/tm-rs6000.h')
| -rw-r--r-- | gdb/tm-rs6000.h | 64 |
1 files changed, 48 insertions, 16 deletions
diff --git a/gdb/tm-rs6000.h b/gdb/tm-rs6000.h index ce4f212..5465c6a 100644 --- a/gdb/tm-rs6000.h +++ b/gdb/tm-rs6000.h @@ -72,15 +72,27 @@ extern char *corefile; /* We are missing register descriptions in the system header files. Sigh! */ struct regs { - int gregs [32]; /* general purpose registers */ - int pc; /* program conter */ - int ps; /* processor status, or machine state */ + int gregs [32]; /* general purpose registers */ + int pc; /* program conter */ + int ps; /* processor status, or machine state */ }; struct fp_status { - double fpregs [32]; /* floating GP registers */ + double fpregs [32]; /* floating GP registers */ }; + +/* To be used by function_frame_info. */ + +struct aix_framedata { + int offset; /* # of bytes in gpr's and fpr's are saved */ + int saved_gpr; /* smallest # of saved gpr */ + int saved_fpr; /* smallest # of saved fpr */ + int alloca_reg; /* alloca register number (frame ptr) */ + char frameless; /* true if frameless functions. */ +}; + + /* Define the byte order of the machine. */ #define TARGET_BYTE_ORDER BIG_ENDIAN @@ -418,12 +430,25 @@ extern unsigned int rs6000_struct_return_address; #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \ FRAMELESS = frameless_function_invocation (FI) +/* Functions calling alloca() change the value of the stack pointer. We + need to use initial stack pointer (which is saved in r31 by gcc) in + such cases. If a compiler emits traceback table, then we should use the + alloca register specified in traceback table. FIXME. */ +/* Also, it is a good idea to cache information about frame's saved registers + in the frame structure to speed things up. See tm-m88k.h. FIXME. */ + +#define EXTRA_FRAME_INFO \ + CORE_ADDR initial_sp; /* initial stack pointer. */ \ + struct frame_saved_regs *cache_fsr; /* saved registers */ + /* Frameless function invocation in IBM RS/6000 is half-done. It perfectly sets up a new frame, e.g. a new frame (in fact stack) pointer, etc, but it doesn't save the %pc. In the following, even though it is considered a frameless invocation, we still need to walk one frame up. */ #define INIT_EXTRA_FRAME_INFO(fromleaf, fi) \ + fi->initial_sp = 0; \ + fi->cache_fsr = 0; \ if (fromleaf) { \ int tmp = 0; \ read_memory ((fi)->frame, &tmp, sizeof (int)); \ @@ -433,9 +458,13 @@ extern unsigned int rs6000_struct_return_address; #define FRAME_SAVED_PC(FRAME) \ read_memory_integer (read_memory_integer ((FRAME)->frame, 4)+8, 4) -#define FRAME_ARGS_ADDRESS(fi) ((fi)->frame) +#define FRAME_ARGS_ADDRESS(FI) \ + (((struct frame_info*)(FI))->initial_sp ? \ + ((struct frame_info*)(FI))->initial_sp : \ + frame_initial_stack_address (FI)) + +#define FRAME_LOCALS_ADDRESS(FI) FRAME_ARGS_ADDRESS(FI) -#define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame) /* Set VAL to the number of args passed to frame described by FI. Can set VAL to -1, meaning no way to tell. */ @@ -460,39 +489,42 @@ extern unsigned int rs6000_struct_return_address; #define FRAME_FIND_SAVED_REGS(FRAME_INFO, FRAME_SAVED_REGS) \ { \ - int frameless, offset, saved_gpr, saved_fpr, ii, frame_addr, func_start; \ + int ii, frame_addr, func_start; \ + struct aix_framedata fdata; \ \ /* find the start of the function and collect info about its frame. */ \ \ func_start = get_pc_function_start ((FRAME_INFO)->pc) + FUNCTION_START_OFFSET;\ - function_frame_info (func_start, &frameless, &offset, &saved_gpr, &saved_fpr);\ + function_frame_info (func_start, &fdata); \ bzero (&(FRAME_SAVED_REGS), sizeof (FRAME_SAVED_REGS)); \ \ /* if there were any saved registers, figure out parent's stack pointer. */ \ frame_addr = 0; \ - if (saved_fpr >= 0 || saved_gpr >= 0) { \ + /* the following is true only if the frame doesn't have a call to alloca(), \ + FIXME. */ \ + if (fdata.saved_fpr >= 0 || fdata.saved_gpr >= 0) { \ if ((FRAME_INFO)->prev && (FRAME_INFO)->prev->frame) \ frame_addr = (FRAME_INFO)->prev->frame; \ else \ frame_addr = read_memory_integer ((FRAME_INFO)->frame, 4); \ } \ \ - /* if != -1, saved_fpr is the smallest number of saved_fpr. All fpr's \ + /* if != -1, fdata.saved_fpr is the smallest number of saved_fpr. All fpr's \ from saved_fpr to fp31 are saved right underneath caller stack pointer, \ starting from fp31 first. */ \ \ - if (saved_fpr >= 0) { \ - for (ii=31; ii >= saved_fpr; --ii) \ + if (fdata.saved_fpr >= 0) { \ + for (ii=31; ii >= fdata.saved_fpr; --ii) \ (FRAME_SAVED_REGS).regs [FP0_REGNUM + ii] = frame_addr - ((32 - ii) * 8); \ - frame_addr -= (32 - saved_fpr) * 8; \ + frame_addr -= (32 - fdata.saved_fpr) * 8; \ } \ \ - /* if != -1, saved_gpr is the smallest number of saved_gpr. All gpr's \ + /* if != -1, fdata.saved_gpr is the smallest number of saved_gpr. All gpr's \ from saved_gpr to gpr31 are saved right under saved fprs, starting \ from r31 first. */ \ \ - if (saved_gpr >= 0) \ - for (ii=31; ii >= saved_gpr; --ii) \ + if (fdata.saved_gpr >= 0) \ + for (ii=31; ii >= fdata.saved_gpr; --ii) \ (FRAME_SAVED_REGS).regs [ii] = frame_addr - ((32 - ii) * 4); \ } |