Allocating Static Patch Space
TotalView can statically allocate patch space if you add a specially named array to your program. When TotalView needs to use patch space, it uses the space created for this array.
You can include, for example, a 1 MB statically allocated patch space in your program by adding the TVDB_patch_base_address data object in a C module. Because this object must be 8-byte aligned, declare it as an array of doubles; for example:
/* 1 megabyte == size TV expects */
#define PATCH_LEN 0x100000
double TVDB_patch_base_address [PATCH_LEN / sizeof(double)]
If you need to use a static patch space size that differs from the 1 MB default, you must use assembler language. The following shows sample assembler code for IBM AIX-Power:
.csect .data{RW}, 3
.globl TVDB_patch_base_address
.globl TVDB_patch_end_address
TVDB_patch_base_address:
.space PATCH_SIZE
TVDB_patch_end_address:
To use the static patch space assembler code:
1. Use an ASCII editor and place the assembler code into a file named tvdb_patch_space.s.
2. Replace the PATCH_SIZE tag with the decimal number of bytes you want. This value must be a multiple of 8.
3. Assemble the file into an object file by using a command such as:
cc -c tvdb_patch_space.s
4. Link the resulting tvdb_patch_space.o into your program.
